Hawker Service Bulletin Master Index - Beechcraft...DH/BH/HS/BAe 125 Series 3 A/RA, 400A, 700A, 800A and 1000A SB 00-2001 May 2007 6 O 00-00 General - Hawker Beechcraft Publications

Hawker Service Bulletin Master Index

Service Bulletins (sorted by ATA Chapter/SB Number)

SB No. Date Rev No *Class Chapter Description Effectivity

ATA Chapter 00General Introduction

SB 00-12 May 2008 3 O 00 General/Introduction - A cross reference listingis provided listing North American (NA)reference numbers against serial (constructors)numbers

DH/BH/HS/BAe 125 Series 3 A/RA, 400A, 700A,800A and 1000A

SB 00-2001 May 2007 6 O 00-00 General - Hawker Beechcraft Publications –What Is Available and How to Obtain It

All Hawker Beechcraft Corporation non-militaryairplane models in service.

SB 00-3000 Sep 1997 1 O 00-00 General - Publications - Information on theIntroduction of a New Service Bulletin Formatand Numbering System

All Beech models; All DH/BH/HS/BAe 125 series1 to 1000 (including major variants: C29A andU125); All Hawker 800 (including major variant:U125A), Hawker 800XP and Hawker 1000; AllRaytheon Aircraft models; All Mitsubishi MU300and MU300-10 models.

SB 01-22 May 2006 2 O 01 Certification Documents - General - ToIntroduce Changes to Meet ISRAELICertification Requirements

Hawker 800XP, Serials 258279, 258283, 258391and 258538.

12/24/2008 Page 1 of 224Hawker Service Bulletin Master Index

*Class: M = Mandatory; O = Optional; R = Recommended; I = Information



ATA Chapter 01Certification Documents

SB 01-1 Apr 1995 - I 01 Certification Documents - General - Tointroduce the conversion of a series 1000Baircraft to a series 1000A aircraft

BAe 125 Series 1000B aircraft 259021

SB 01-11 Oct 1995 - I 01 Certification Documents - General - Tointroduce the conversion of a Series 1000Baircraft to a series 1000A aircraft


SB 01-14 Oct 1995 - I 01 General - The conversion of Hawker 800aircraft 258261 to meet Brazilian certificationrequirements.

Series 800 aircraft 258261

SB 01-19 Oct 1995 - I 01 General - To introduce the conversion of aseries 800B aircraft to a series 800A aircraft


SB 01-2 Dec 1994 - I 01 General - To introduce omnibus completionmodification including changes for publictransport category

Hawker Series 800 aircraft 258258

SB 01-20 Nov 1995 - I 01 To introduce the conversion of a Series 1000Baircraft to a series 1000A aircraft

BAe 125 Series 1000 aircraft 259026

SB 01-21 May 1996 - I 01 Certification Documents - General - Tointroduce the conversion of a Series 1000Baircraft to a series 1000A aircraft


SB 01-23 Jul 2001 1 O 01 Certification Documents - General - ToIntroduce Changes to Meet ISRAELICertification Requirements.


SB 01-24 May 2006 2 O 01 Certification Documents - General - ToIntroduce Changes to Meet ISRAELICertification Requirements.


SB 01-25 Aug 1996 - O 01 General - To introduce the conversion of aseries F400B aircraft to a series 400A aircraft

HS 125 Series F400B aircraft 25248

SB 01-26 Aug 1996 - O 01 General - To introduce the conversion of aseries F400B aircraft to a series 400A aircraft


SB 01-27 Nov 1996 - I 01 General - To introduce the conversion of aseries 700B aircraft to a series 700A aircraft

HS 125 Series 700B aircraft 257127





SB 01-28 Apr 1997 - O 01 General - To introduce the conversion of aseries 700B aircraft to a series 700A aircraft


SB 01-3 Mar 1995 - O 01 Certification Documents - General - Tointroduce the conversion of a BAe 125 series800B aircraft to a BAe series 800A aircraft tomeet requirements for swedish airworthinessregistration.


SB 01-3009 Apr 1998 - O 01 To introduce the conversion of a series 600Baircraft to a series 600A aircraft.


SB 01-3043 Nov 1997 - O 01 To introduce the conversion of a series 1000Baircraft to a series 1000A aircraft.


SB 01-3160 Nov 1998 1 O 01 To introduce the conversion of a Series 800BAircraft to a Series 800A Aircraft

BAe 125 Series 800B, Serial 258112

SB 01-3161 Mar 1998 - O 01 To introduce the conversion of a series 1000Baircraft to a series 1000A aircraft


SB 01-3162 Jan 1998 - O 01 To introduce the conversion of a Hawker 800from the B configuration to an A configuration.

Hawker 800 aircraft 258258.

SB 01-3176 Mar 1998 - O 01 To introduce the conversion of a series 800Baircraft to a series 800A aircraft.

BAe 125 Series 800B (258177)

SB 01-3177 Mar 1998 - O 01 To introduce the conversion of a series 700Baircarft to a series 700A aircraft


SB 01-3193 May 1998 - O 01 To introduce the conversion of a series 1000Baircraft to a series 1000A aircraft

BAe 125 Series 1000B Serial 259007

SB 01-3194 Jun 1998 1 O 01 To introduce the conversion of a series 700Baircraft to a series 700A aircraft

HS125 Series 700B Serial 257100

SB 01-3196 Nov 1998 1 O 01 To introduce the conversion of a series 400Baircraft to a series 400A aircraft

HS125 Series 400B Serial 25243

SB 01-3208 Nov 1998 1 O 01 To introduce the conversion of a Series F600Baircraft to a Series 600A aircraft withmodification 252468

HS 125 Series F600B, Serial 256029

SB 01-3220 Nov 1998 - O 01 Certification Documents - General - Tointroduce the conversion of a Series 600BAircraft to a Series 600A Aircraft

HS 125 Series 600B, Serial 256017





SB 01-3246 Jan 1999 - O 01 To introduce the conversion of a Series 600BAircraft to a Series 600A Aircraft


SB 01-3247 Jan 1999 - O 01 To introduce the conversion of a Series 800BAircraft to a Series 800A Aircraft


SB 01-3285 Mar 1999 - O 01 To introduce the conversion of a Series F600Baircraft to a Series 600A aircraft


SB 01-3286 Feb 1999 - O 01 To introduce the conversion of a Series 700BAircraft to a Series 700A Aircraft


SB 01-3295 Mar 1999 - O 01 To Introduce the Conversion of a Series F600BAircraft to a Series 600A Aircraft


SB 01-3302 Mar 1999 - O 01 To Introduce the Conversion of a Series 800BAircraft to a Series 800A Aircraft


SB 01-3305 Jun 1999 - O 01 To introduce the conversion of a Series 600BAircraft to a Series 600A Aircraft


SB 01-3306 Aug 1999 - O 01 To introduce the conversion of a Series 700BAircraft to a Series 700A Aircraft


SB 01-3319 Jun 1999 - O 01 To introduce the conversion of a Series 700BAircraft to a Series 700A Aircraft


SB 01-3337 Dec 1999 1 O 01 To introduce the conversion of a Series 600BAircraft to a Series 600A Aircraft


SB 01-3347 Nov 1999 - O 01 To introduce the conversion of a Series 700BAircraft to a Series 700A Aircraft


SB 01-3350 Nov 1999 - O 01 To introduce the conversion of a Series 700BAircraft to a Series 700A Aircraft


SB 01-3367 Nov 2001 1 O 01 * Superseded by SB 01-3370 HS 125 Series 600B, Serial 256035.

SB 01-3370 Sep 2002 3 O 01 Converting 600B/F600B to 600A Type Design(See 14 CFR 21.183 (d)(1) or equivalent.)

Hawker Siddeley Model HS.125 Series600B/F600B, Serials 256024, 256035, 256045and 256048.

SB 01-3382 Dec 1999 - O 01 To Introduce the conversion of a Series 700BAircraft to a Series 700A Aircraft


SB 01-3383 Apr 2000 - O 01 To introduce the conversion of series 1000Aaircraft to series 1000B Aircraft

BAe 125 Series 1000A, Serial 259008.





SB 01-3384 Feb 2000 1 O 01 Certification Documents - General – Tointroduce the conversion of a Series 800Baircraft to a series 800A Aircraft

BAe125 Series 800B, Serial 258228.

SB 01-3392 Jan 2007 10 O 01 Certification Documents - To introduce theconversion of series 800B Aircraft to series800A Aircraft

This Service Bulletin has been revised to addaircraft serial number 258219 to the effectivity.BAe.125 Series 800B, Serial Numbers 258028,258085, 258088, 258091, 258097, 258120,258165, 258192, 258197, 258208, 258219 and258243.

SB 01-3425 Feb 2004 1 O 01 CERTIFICATION DOCUMENTS - TOINTRODUCE THE CONVERSION OF SERIESF400B AIRCRAFT TO SERIES 400AAIRCRAFT

Hawker Siddeley Model HS.125 Series F400B,Serial 25227 and 25248.

SB 01-3437 Jan 2006 2 O 01 Certification Documents - To Introduce theConversion of Series 700B Aircraft to Series700A Aircraft

Hawker Siddeley Model HS.125 Series 700B,Serials 257064, 257115, 257136, 257208 and257210.

SB 01-3670 Apr 2005 1 O 01 CERTIFICATION DOCUMENTS - TOINTRODUCE THE CONVERSION OF SERIES1000B AIRCRAFT TO SERIES 1000AAIRCRAFT

BAe.125 Series 1000B, Serial Numbers 259008and 259028.

SB 01-3686 Dec 2004 1 M 01 Certification Documents - SupplementalConstructor Data Plate Installation

BAe.125 Series 800A (C-29A), Serials 258129,258131, 258134, 258154, 258156 and 258158.

SB 01-3776 Mar 2006 - O 01 Certification Documents - General - ToIntroduce the Conversion fo a Model 800XPAircraft to a Model 850XP Aircraft

Hawker 800XP, Serials 258750 through 258788,258795 and 258802.

SB 01-3902 Dec 2008 - O 01 Certification Documents - Increased GrossWeight Kit Installation

Model 4000 Serials RC-7 through RC-28.

SB 01-4 Apr 1995 1 I 01 General - To introduce the conversion of a BAe125 series 800B aircraft to a BAe series 800Aaircraft to meet FAA airworthinessrequirements.


SB 01-5 Jun 1995 - I 01 General - To introduce the conversion of aseries 1000B aircraft to a series 1000A aircraft


SB 01-6 Aug 1995 2 I 01 General - To complete the embodiment of U.K.mods in the U.S.A. and delete ferry provisionsfor the aircraft ferried on special categorycertificate of airworthiness

Hawker 800XP aircraft 258266





SB 01-8 Nov 1996 1 I 01 To introduce the conversion of a Series 800Baircraft to a series 800A aircraft






ATA Chapter 09Towing and Taxiing

SB 09-1 Dec 1967 - I 09 To introduce improved towbar. To reduce shearpin breakage.

Series 1, 1A, 1B, 3, 3A, 3/AR, 3B and 3B/R

SB 09-2 Sep 1976 1 O 09 To introduce standard towbar for all seriesaircraft.

Model DH 125 Series 1A, 1A-522, 1A/S-522, 3A,3AR, 3ARA, 400A, Model BH 125 Series 400A,Model HS 125 Series 1, 1-521, 1B, 1B-522,1B/R-522,1B/S-522, 3B, 3BRA, 400B





ATA Chapter 10Parking and Mooring

SB 10-1 May 1966 - I 10 Parking and Mooring - Engine intake and jetengine exit covers - To modify hook assemblies

Series 1, 1A and 1B

SB 10-2 Sep 1965 - R 10 Parking and Mooring - To introduce modifiedbleed valve cover assembly

Series 1, 1A & 1B

SB 10-3 Sep 1965 - O 10 Parking and Mooring - To introduce a modifieddorsal air intake blank

Series 1, 1A & 1B

SB 10-4 Nov 1967 - I 10 Parking and Mooring - To introduce modifiedbleed valve cover assembly

Series 1, 1A, 1B, 3, 3A, 3A/R, 3B & 3B/R

SB 10-5 Feb 1968 - O 10 Parking and Mooring - To introduce modified jetexit covers

Series 1, 1A, 1A-522, 1A/R-522, 1A/S-522, 1B,1B-522, 1B/R-522, 1B/S-522, 3, 3A, 3A/R, 3A/RA,3B, 3B/R, 3B/RA, Mod.251895 and 255811

SB 10-6 Nov 1989 - R 10 Restricted - See Remarks Series 800A C-29A (aircraft 258129 and 258134)





ATA Chapter 11Placards and Markings

SB 11-1 Jun 1969 1 R 11 Required Placards - To introduce labels inPortuguese in place of English throughoutAircraft

Aircraft 25162, 25165, 25166 & 25167 for Brazil

SB 11-10 Jul 1974 1 R 11 Required Placards/Power Plant/Oil - Deletion ofCastrol 98 for Viper 601 engines

Model BH. 125 Series 600A Serials 25/6001,6002, 6003, 6004, 6007, 6009, 6010, 6011, 6013,6014, 6016, 6018, 6020, 6022, 6023, 6025, 6026& 6032 Model HS.125 Series 600B Serials25/6005, 6006, 6008, 6012, 6015, 6017, 6019,6021, 6024, 6027, 6028, 6029, 6030 & 6031.25/256 & 258

SB 11-11A Jan 1975 1 R 11 Required Placards - Aircraft General - Tointroduce increased operating speeds andweights

Model BH. 125 Series 600A Serials 25/6001,6002, 6003, 6004, 6007, 6009, 6010, 6011, 6013,6014, 6016, 6018, 6020, 6022 & 6023

SB 11-11B Jan 1975 1 R 11 Required Placards - Aircraft General - Tointroduce increased operating speeds andweights

Model HS.125 Series 600B Serials 25/6005,6006, 6008, 6012, 6015 and 6017, 25/256 and258

SB 11-11C Nov 1983 2 O 11 Required Placards / Aircraft General - Tointroduce increased operating speeds andweights

Model BH. 125 Series 600A Serials 25/6001,6002, 6003, 6004, 6007, 6009, 6010, 6011, 6013,6014, 6016, 6018, 6020, 6022, 6023, 6024, 6025,6026, 6032, 6034, 6038, 6040, 6044, 6046, 6047,6051, 6055, 6061, 6066, 6067, 6068, 6069, 6070and 6071

SB 11-11D Jan 1975 1 O 11 Required Placards - Aircraft General - Tointroduce increased operating speeds andweights

Model HS.125 Series 600B Serials 25/256 and258, 25/6005, 6006, 6008, 6012, 6015, 6017,6019, 6021, 6024, 6027, 6028, 6029, 6030, 6031,6033, 6035, 6037, 6041, 6042, 6043, 6045, 6050,6052, 6053 and 6054.

SB 11-12 Mar 1986 2 O 11 Required Placards - Aircraft General - Topermit increases in zero fuel ramp and take-offweights. Aircraft re-designated Series SB/RC

Model HS. 125 Series 3B/RA serials 25/113, 140,143, 144, 147, 154, 162, 164 to 169, 171 and 172

SB 11-13 Nov 1974 - R 11 Required Placards - Galley and ToiletCompartments - Revised and new labelsintroduce o improve safety precautions

Model HS.125 Series 1, 1-521, 1B, 1B-522,1B/R-522, 1B/S-522, 3B, 3BRA, 400B, 401B,403B and 600B





SB 11-14 May 1975 - O 11 Required Placards - Operating LimitationsLabel - New label introduced giving minimumoil temperature for starting -40 degrees C

Model DH. 125 Series 1A, 1A-522, 1A/S-522, 3A,3AR, 3ARA, 400A Model BH. 125 Series 400AModel HS. 125 Series 1-521, 1B, 1B-522,1B/R-522, 1B/S-522, 3B, 3BRA, 400B, 401B and403B

SB 11-16 Nov 1980 2 O 11 Required Placards - Operating LimitationsLabel - New label introduced increasingmaximum take-off weight to 25,500lb

Series 700A aircraft post mod 252648 & 700B

SB 11-17 Oct 1981 1 I 11 Placards and Markings - To increase maximumtake-off weight to 25,500lbs

Series 600A with Mod 252468 and F600B

SB 11-18 Jun 1987 4 I 11 Required Placards - Zero fuel weight increasedfrom 16,050 lbs to 16,300 lbs

All 125 Series 700B and Series 700A postMod.252648

SB 11-18A Jun 1987 - I 11 Required Placards - Zero fuel weight increasedfrom 16,050 lbs to 16,300 lbs

125 Series 700B aircraft 27/7166, 7169, 7172,7175, 7178, 7181, 7183, 7189, 7190, 7194 and7200 plus future 700B aircraft with Collins ADS 80Air Data System.

SB 11-18B Feb 1984 - I 11 Required Placards - Zero fuel weight increasedfrom 16,050 lbs to 16,300 lbs

125 Series 700B aircraft

SB 11-18C Jun 1987 4 I 11 Required Placards - Zero fuel weight increasedfrom 16,050 lbs to 16,300 lbs

125 Series 700B aircraft

SB 11-18D Nov 1983 - I 11 Required Placards - Zero fuel weight increasedfrom 16,050 lbs to 16,300 lbs

125 Series 700A aircraft post Mod 252648

SB 11-18E Oct 1986 3 I 11 Required Placards - Zero fuel weight increasedfrom 16,050 lbs to 16,300 lbs

125 Series 700A aircraft with ADS 80K Air DataSystem

SB 11-18F Jun 1987 - I 11 Required Placards - Zero fuel weight increasedfrom 16,050 lbs to 16,300 lbs

125 Series 700A aircraft 25/7001

SB 11-19 Mar 1985 1 R 11 Placards and Markings - To introduce awindscreen warning label

BAe 125 Series 800A & 800B aircraft

SB 11-2 May 1969 - O 11 Required Placards - To introduce newlimitations label

Series 1A-521 1B-521 1A-522 1B-522 1A/S-5221B/S-522 3A 3B (Not A/C 25015)

SB 11-20 Jul 1985 - I 11 Required Placards - Zero fuel weight increasefrom 14,700 lbs to 15,200 lbs


SB 11-21 Jan 1987 1 I 11 Required Placards - Zero fuel weight increasefrom 14,700 lb to 15,200 lb

Part B BH 125 Series 403B, Part C BH/DH 125Series 400A post Mod 252550 , Part D BH/DH/HS125 Series F400B aircraft





SB 11-22 Nov 1989 - R 11 Restricted - See Remarks Series 800A C-29A aircraft 258129 & 258134

SB 11-23 Dec 1989 - R 11 Restricted - See Remarks Series 800A C29A aircraft 258129, 258131 &258134)

SB 11-24 Jan 1992 - O 11 Placards and Markings - Instrument Panels -To relocate 'Ventral Tank not empty VMO 280'Label on L.H. and R.H. Instrument Panels

Series 800B

SB 11-25 Dec 2000 1 O 11 Interior Placards - Operating Limitations -Maximum zero fuel weight increased to 17,750lb. from 17,520 lb.

BAe.125 Series 800A Pre-Mod 253169A,Post-Mod 259579A.

SB 11-26 Jan 1993 - O 11 Placards and Markings - To introduce revisedaircraft registration number

Series 1000B aircraft 259026

SB 11-27 Aug 1993 - I 11 Placards and Markings - To introduce externallabels in Russian.


SB 11-29 Sep 1993 - I 11 Placards and Markings - Interior Placards -Operating Limitation - Maximum zero fuelweight increased to 20,400 lb. from 20,300 lb


SB 11-3 Dec 1970 - I 11 Required Placards - To introduce a newOperations Limitations Label

Model HS 125 Series 1

SB 11-30 Jul 1993 - I 11 To enable aircraft operation under Australianregulations.


SB 11-31 Jul 1993 - I 11 To introduce in compliance with AD/G/73 -Access to type III exits


SB 11-3175 Mar 1999 - R 11 Placards and Markings - 'DA-D' PANEL -Circuit Breaker Label

Hawker 800 (U-125A) JASDF airplanes, SerialNumbers 258245, 258247, 258250, 258268 and258288

SB 11-3184 Sep 1999 - O 11 Placards and Markings - Zero Fuel WeightIncreased from 16,050 lbs to 16,300 lbs

HS 125 Series 700A with IntercontinentalDynamics Corporation (IDC) Combined SpeedIndicators with integral speed warning switches

SB 11-32 May 1994 - I 11 Placards and Markings - To increase maximumzero fuel weight from 14,700 lb to 15,200 lb

HS 125 Series F3B/RA aircraft

SB 11-34 Feb 1995 - I 11 Restricted - See Remarks Hawker 800 U-125A

SB 11-35 Feb 1995 - I 11 Restricted - See Remarks Hawker 800 U-125A

SB 11-3624 Mar 2004 1 M 11 * Superseded by SB 34-3655. * Superseded by SB 34-3655





SB 11-3652 Feb 2006 1 R 11 Placards and Markings - Engine OperatingLimitations Placard Replacement

Hawker 800XP, Serial Numbers 258266 and258277 through 258669.

SB 11-3666 May 2004 - R 11 Placards & Markings - External Aft BaggageCompartment Capacity Decal Modification

Raytheon Aircraft Model 400A Beechjet, SerialsRK-78 and RK-87 through RK-353;RaytheonAircraft Model 400A Hawker 400XP, SerialsRK-354 through RK-379.

SB 11-37 Oct 1995 - O 11 Introduction of metric limitations label forHawker 800 aircraft to satisfy Braziliancertification requirements

Hawker 800 post Mod. 253558A

SB 11-3820 Jan 2007 1 O 11 Placards and Markings - Dual English/GermanPlacard Installation

Hawker 850XP, Serial Number 258778.

SB 11-3863 Nov 2007 - R 11 Placards and Markings – Aft Fuselage FuelTank Filler Access Door Decal Removal

Hawker Beechcraft Corporation (HBC), BeechjetModel 400A, Serials RK-1 through RK-353; Model400A (Hawker 400XP), Serials RK-354 throughRK-526.

SB 11-4 Jul 1972 1 O 11 Operations Limitations Label. New labelintroduced with autopilot speeds above andbelow 15000ft.

Model HS 125 Series 1, 1-521, 1B, 1B-522,1B/R-522, 1B/S-522, 3B, 3BRA & 400B

SB 11-5 May 1972 - O 11 Required Placards -To permit increase intake-off weight and taxying weight to 23,300 lbsand redesignate aircraft 3B/RB afterembodiment of Mod.252024

Model HS 125 Series 3BRA

SB 11-7 Jun 1973 1 O 11 Required Placards - Aircraft General - Topermit increases in zero fuel and ramp weightswith relevant placard, switch and instrumentchanges and redesignate certain aircraft series

Model DH 125 Series 400A Aircraft NA 711 to752 inclusive less 714, 725, 741 and 746. ModelBH 125 Series 400A Aircraft NA 753 to 780inclusive less 754, 771 and 773.

SB 11-7A Apr 1973 - O 11 Required Placards - Aircraft General - Topermit increases in zero fuel and ramp weightswith relevant placard, switch and instrumentchanges and redesignate certain aircraft series

Model BH 125 Series 400A aircraft 25283 (NA776)

SB 11-7B Mar 1976 1 O 11 Required Placards - Aircraft General - Topermit increases in zero fuel and ramp weightswith relevant placard, switch and instrumentchanges and redesignate certain aircraft series

Model HS 125 Series 400B Aircraft 25178, 184,189, 194, 197, 199, 209, 215, 217, 219, 223, 227,231 235, and 238

SB 11-7C Apr 1973 - O 11 Required Placards - Aircraft General - Topermit increases in zero fuel and ramp weightswith relevant placard, switch and instrumentchanges and redesignate certain aircraft series

Model HS 125 Series 400B Aircraft 25240, 243,246 to 255, 257, 259, 260, 264, 266, 268 to 271and 274





SB 11-7D Mar 1976 1 O 11 Required Placards - Aircraft General - Topermit increases in zero fuel and ramp weightswith relevant placard, switch and instrumentchanges and redesignate certain aircraft series

Model DH 125 Series 400A Aircraft NA 711 to752 inclusive less 714, 725, 741 and 746. ModelBH 125 Series 400A Aircraft NA 753 to 780inclusive less 754, 771 and 773.

SB 11-7E Mar 1976 2 O 11 Required Placards - Aircraft General - Topermit increases in zero fuel and ramp weightswith relevant placard, switch and instrumentchanges and redesignate certain aircraft series

Model DH 125 Series 400A aircraft NA714, 725,741, 746, 754, 771and 773.

SB 11-7F Jun 1973 1 O 11 Required Placards - Aircraft General - Topermit increases in zero fuel, take-off and rampweights with relevant placard, switch andinstrument changes, and redesignate certainaircraft series

Model HS 125 Series 401B aircraft 25/242

SB 11-7G Jun 1973 - O 11 Required Placards - Aircraft General - Topermit increases in zero fuel and ramp weightswith relevant placard change and redesignateaircraft Series 403B

Model HS 125 Series 401B aircraft 25/277, 288,289 and 290

SB 11-8 Apr 1973 1 O 11 Required Placards - To introduce label withincreased taxi and take-off weight figures forSeries 1A, 1B Pre.Mod 251301, and 3A aircraft

Series 1A, 1B (Pre Mod.251301) and 3A

SB 11-9 May 1974 1 R 11 Required Placards/Power Plant/Oil -Label/wording at oil filler access panel revised.Instruction card introduced in Manuals lockerlisting approved oils and tank capacity

Series 1, 1-(521), 1A, 1A-522, 1A/S-522, 1B,1B-522, 1B/R-522, 1B/S-522, 3A, 3A/R, 3A/RA,3B, 3B/RA, 400A, 400B, 401B, 403B, 600A and600B.





ATA Chapter 21Environmental/Air Conditioning

SB 21-1 Aug 1964 - O 21 Air Conditioning - To introduce improvedmounting of forward pipe from 'T' piece

Series 1

SB 21-108 Jul 1975 4 O 21 Air Conditioning - Refrigeration bypass valve -Valve repositioned and refrigeration by-passduct introduced upstream of water separator

Model DH.125 Series 1A-522, 1A/S-522, 3A,3A/R, 3A/RA, 400A . BH.125 Series 400A and600A. Mode HS.125 3B, 3BRA, 400B, 401B,403B and 600B.

SB 21-11 Dec 1970 1 I 21 Air Conditioning - Temperature Control - Part'A' - To introduce HSD Mod CC/B 8509 to linkassy BA2-04820 - Part 'B' - To introduce HSDMod CC/B 8421 to Link Assembly B.A2 - 04820

Series 1, 1A aircraft 25013, 037and 058, 1B,1B-522, 1B/R-522, 1B/S-522 aircraft 25090, 3Baircraft 25015, 062, and 069.

SB 21-110 May 1974 - R 21 Air Conditioning - Air Distribution - Failure tore-fit non-return valve

Models HS/DH/BH 125 Series 1, 1A, 1B 3, 3A,3B, 400A,400B. All variants 600A and 600B toaircraft 256030.

SB 21-115 Feb 1976 - R 21 Air Conditioning - Ducting - To introduceNarrower Clips at the sleeve, connecting the airconditioning duct to the inlet of the waterextractor & to control lagging on duct ends

Model HS.125 Series 403B, 600A and 600BModels BH.125 600A

SB 21-117 May 1977 - R 21 Air Conditioning - Temperature control - Tointroduce controller with revised low limitsetting

Models HS/ BH. 125 Series 600A, 600B and 600F

SB 21-118 Apr 1978 1 O 21 Air Conditioning - Distribution - To introduce awarm air supply at foot level to the vestibulearea

Model DH.125 series 1 and 3. Model BH.125series 400, 401, 403 and 600. Model HS.125series 1, 3, 400, 401, 403, 600 and 700.

SB 21-119 Sep 1978 - M 21 Air Conditioning - Mixing valve (LP/HP) failureof outlet body LH and RH mixing valves

Model HS 125 Series 1A, 400A, 600A, 600F,700A and 700B

SB 21-12 Dec 1970 1 I 21 Introduces miscellaneous HSD Mods. Totemperature controller BA2-13020.

Series 1, 1A aircraft 25013 037 058, 1B, 1B-522,1B/R-522, 1B/S-522 aircraft 25090, 3B aircraft25015 062 and 069

SB 21-120 Apr 1979 - R 21 Air Conditioning - Engine ducting - Incorrectmanufacture of clamps

All A/C with TFE engines up to and includingSeries 700 (not A/C 257054 7055 7058)

SB 21-121 Nov 1979 - O 21 Air Conditioning - Pilots air supply - Globeindustries fan No. 19A 2323 replaces Pullin fanPMI-4A

Model DH/HS 125 Series 1and 3 and all variants,Model HS/BH 125 Series 400, 401, 403 and allvariants.





SB 21-122 Dec 1980 - O 21 To introduce a water separator with reviseddrain system - To improve drainage from waterseparator.

Series 1, 3, 400, 401, 403, 600 and 700

SB 21-123 Dec 1982 3 M 21 Air conditioning - Introduction of fragmentationguard for B.Ae Dynamics group cold air unit

Model HS 125 pre- Mod 251600, Series 1, 1A, 1Band 3B aircraft plus any aircraft with BAeDynamics Group air conditioning unit

SB 21-124 Feb 1985 - R 21 To introduce revised cabin pressure controllerhose. To reduce the possibility of the hosekinking.

Model BAe.125 Series 800A and 800B

SB 21-125 Jan 1986 1 O 21 Air conditioning - Flight deck cooling fans Model BAe.125 Series 800B aircraft 258007, 013,016, 019, 021,022, 025, 028 and 031.

SB 21-126 Nov 1985 - R 21 Air Conditioning - Introduction of air hoses ofincreased stiffness to the cabin pressurecontroller and differential pressure gauge

Model BAe 125 Series 800A and 800B aircraft258001 to 062

SB 21-127 Oct 1986 - R 21 Possible electrical short in in temperaturecontrol circuit.

Model HS 125 Series 600A and 600B and allvariants

SB 21-128 Jun 1987 1 M 21 Air Conditioning - Distribution - Introduction offlight deck side console louvres and adapters ofan approved fire resistant material

Series 800A and 800B Post Mod.253070, 259134or 259389

SB 21-129 May 1988 - O 21 Air Conditioning - Pressurization - Improvedinitiation on aircraft with Garrett APU

Series 800 Pre Mod.253149C with Garrett APU

SB 21-130 Oct 1989 1 O 21 Air Conditioning - Pressurization - Improvedinitiation on aircraft with Turbomach A.P.U.

Series 800 aircraft Post Mod.253149 withTurbomach APU (BAe Mod.259404B)

SB 21-131 May 1988 - I 21 Introduction of relocated cold air unit exhaustoutlet.

BAe 125 Series 800 aircraft Post Mod.259499Aand Pre Mod.253175B or C with Turbomach APU

SB 21-132 May 1988 - I 21 Introduction of relocated cold air unit exhaustoutlet.

BAe 125 Series 800 aircraft Post Mod.259499Aand Pre Mod.253175B with Garrett APUMod.258748/259185A

SB 21-133 Oct 1992 1 I 21 Permits operations into high altitude airfields. Series 800 aircraft 258091 and subsequent.

SB 21-134 Sep 1989 - R 21 Restricted - See Remarks Series 800A C-29A aircraft 258129

SB 21-135 Dec 1989 - R 21 Restricted - See Remarks Series 800A C-29A Post Mod 253205C aircraft258129, 131 and 134.

SB 21-136 Dec 1989 - R 21 Restricted - See Remarks Series 800A C-29A aircraft 258129, 131, 134.





SB 21-137 Feb 1990 1 R 21 Restricted - See Remarks Series 800A C-29A aircraft 258129, 131 and 134.

SB 21-139 Feb 1991 - O 21 Restricted - See Remarks Series 800A C-29A aircraft 258129, 131, 134,154, 156 and 158. Series 800A and 800B PostMod 253205C.

SB 21-14 Dec 1970 1 I 21 Introduces miscellaneous Mods. To mass flowcontroller BA2-14017A.

Series 1, 1A aircraft 25013, 037 and 058, 1B,1B-522, 1B/R-522, 1B/S-522 aircraft 25090, 3Baircraft 25015, 062 and 069.

SB 21-140 May 1991 - R 21 Inspection of pressurisation control pipe forclearance with elevator up-cable.

Model BAe. 125 Series 800A and 800B PreMod.253254A

SB 21-141 Jun 1991 - I 21 Restricted - See Remarks Series 800 C-29A aircraft 258129, 131, 134, 154,156 and 158.

SB 21-142 Dec 2004 1 R 21 * Superseded by SB 21-3669 Series 1 to 700 Mod 251600 800 and 1000. ThisService Bulletin has been superseded byMANDATORY Service Bulletin 21-3669.

SB 21-143 Sep 1992 - O 21 Air conditioning - Refrigeration unit -Introduction of cold air unit with an improvedcooling turbine

All Series up to and including 800 PostMod.252918 and Pre Mod.253205A

SB 21-144 Oct 1992 - O 21 Air Conditioning - Heating - Revision of cabinair distribution arrangements at the heaterblower (Frame 15 RH)

Series 1000A and 1000B Pre Mod 253603A

SB 21-145 Feb 1993 1 R 21 Air Conditioning - Inspection of cold air unit forpresence of pre-cooler mounting brackets

Model BAe.125 Series 1000

SB 21-146 Jun 1995 1 I 21 AIR CONDITIONING - Pressurization Control -To permit operation of the aircraft up to theaircraft up to an airfield altitude of 10,000 feet

BAe 125 series 1000A and 1000B and Hawker1000

SB 21-148 Sep 1994 - O 21 Cold Air Unit. To introduce a cold air unitexhaust duct with silencer liner

Model BAe 125 Series 800A, 800B and Hawker800 which are Post Mod.253175B (ECU DuctingSimplified)

SB 21-149 Sep 1994 - R 21 Bleed Air System. Introduction of replacementmixer valves

Model Bae 125 Series 1000A, 1000B and Hawker1000

SB 21-15 Dec 1970 1 I 21 Introduces miscellaneous HSD Mods. To coldair unit BA2-16003A.

Series 1, 1A aircraft 25013, 037 and 058, 1B,1B-522, 1B/R-522, 1B/S-522 aircraft 25090 and3B aircraft 25015, 062 and 069.

SB 21-151 Jul 1994 - M 21 Introduction of pressure relief device within therear luggage compartment

Model BAe 125 Series 1000A, 1000B and Hawker1000





SB 21-152 Nov 1994 - I 21 Air conditioning - To introduce replacementcabin altitude warning switch

Model BAe 125 Series 1000A, 1000B and Hawker1000. Models DH/BH/HS/BAE Series 1 to 600inclusive and Hawker 800 excluding aicraft28529, 260, 261 and 262 which are covered by253570D (SB-21-53-3570D)

SB 21-153 Jul 1994 - R 21 Air Conditioning - To introduce replacementcabin altitude warning switch (9300 ft).

Model Hawker 800 aircraft 258259, 260, 261 and262.

SB 21-154 Jan 1995 - I 21 Restricted - See Remarks BAe 125 Series 800A U-125 aircraft 258215

SB 21-155 Feb 1996 - O 21 Air Conditioning - To introduce a silencer to theCAU exhaust of the 3-wheel ECS

Model Hawker 800 aircraft 258266

SB 21-156 Mar 1997 - R 21 To introduce replacement ECS system ductclamps.

Models BAe 125 Series 800 Major Variant C29Aaircraft

SB 21-157 Jan 1996 - R 21 Restricted - See Remarks Model Hawker U-125A aircraft 258245, 247 and250.

SB 21-158 Jan 1996 - R 21 Restricted - See Remarks Model Hawker U-125A aircraft 258245, 247 and250.

SB 21-159 Mar 1996 - R 21 Inspection of LH and RH mixer valve insulationmuff assemblies for correct part numbering andorientation

Applicable to BAe 125 Series 1000A, 1000B andHawker 1000 aircraft Post Mod 253690A

SB 21-16 Dec 1970 1 I 21 Temperature Control. To introduce HSD ModCC/B7617 to cabin selector BA2-13471A (HSDSB21-69).

Series 1, 1A (25/013, 037, 058) 1B, 1B-522,1B/R-522, 1B/S-522, (25/090) and 3B (25/015,062, 069).

SB 21-160 Nov 1996 - O 21 Cabin Pressure Relief/Outflow Valves -Introduction of valve part numbers 103278-13and 103278-17, series 2.

BAe 125 Series 800A, 800B, Hawker 800 andHawker 800XP. BAe 125 Series 1000A, 1000Band Hawker 1000

SB 21-17 Dec 1970 1 O 21 Temperature Control. To introduce HSD ModCC/B8175 to transfomer BA2-13007A (HSDSB21-66).

Series 1, 1A (25/013, 037, 058), 1B, 1B-522,1B/R-522, 1B/S-522 (25/090) and 3B (25/015,062, 069).

SB 21-18 Dec 1970 1 I 21 Temperature Control. To introduce HSD ModCC/B7667 to duct stat BA2-13077A.


SB 21-19 Dec 1970 2 O 21 Temperature Control. To introduce DunlopMod.M255 on pressure switchACM22232-Issue 3 in lieu of Issue 2.

Series 1, 1A (25/013, 037, 058), 1B and 1B-522.





SB 21-2 Jan 1965 1 I 21 To introduce Airscrew and Weyroc fan58C4/141 in lieu of 58C4/131 for cabin airre-circulation.

Series 1 and 1B.

SB 21-20 Dec 1970 1 O 21 Introduction of Teddington Mod.C1880 onbutterfly valve FMPA5178.


SB 21-21 Dec 1970 1 O 21 Introduction of Teddington Mod.C1881 onbutterfly valve FMPA5178.

Series 1, 1A (25/013, 037, 058), 1B, 1B-522,1B/R-522, 1B/S-522 (25/015, 062, 069).

SB 21-23 May 1965 - O 21 Introduction of recirculatory air fan & ductingtogether with electrical wiring and switchcontrol.

Series 1

SB 21-24 Jun 1965 - O 21 Temperature Control. To introduce a terminalblock breakdown point for cabin temperaturecontrol valve.

Series 1, 1A and 1B

SB 21-27 Dec 1965 - R 21 Cabin air supply duct between frames 8 & 9 -To position sleeve clamps to avoid foulingelevator control cable.

Applicable to HS.125 aircraft Series 1A

SB 21-28 Feb 1966 - M 21 Air Conditioning - Normalair Safety and InwardRelief Valve - Correct Position of Valve

Series 1, 1A, 1B and 3

SB 21-29 Jan 1971 1 I 21 Temperature Control. To introduce HSD ModCC/B8211 on temperature controllerB01A213020A.


SB 21-3 Jan 1971 2 I 21 To introduce Armstrong Whitworth non-returnvalve AWE 124/50A in place of AWE 124/50.

Series 1 and 1A (25/013 and 014).

SB 21-30 Mar 1966 - O 21 Pressurization Control - To improve functioningof discharge valve inlet.

Series 1B

SB 21-31 Dec 1970 1 O 21 Initiation valve FMP/A/5178. Introducing HSDMod.C1971 (Teddington SB21-52).

Series 1, 1A (25/013, 037, 058), 1B, 1B-522,1B/R-522 and 3B (25/015, 062, 069).

SB 21-3108 Nov 1998 - M 21 Inspection of turbine air discharge duct forcorrect bead height.

Model BAe 125 Series 1000A, 1000B and Hawker1000

SB 21-3136 Dec 1997 - O 21 Pressurization control. To permit operationsinto high altitude airfields.

Hawker 800XP





SB 21-3173 Aug 1999 - R 21 Restricted - See Remarks BAe 125 Series 800 U125 JASDF aircraft258215, 242, Hawker 800 (U125) JASDF aircraft258245, 247, 250, 268 and 288. BAe 125 Series800 (C-29A) FAA aircraft 258129, 131, 134,154,156 and 158.

SB 21-32 Dec 1970 1 O 21 Initiation valve FMP/A/5178. Introducing HSDMod.C1994 (Teddington SB21-69).


SB 21-33 Dec 1970 1 O 21 Distribution. Introducing HSD Mod.CC/B9028to mass flow controller B00A214017A (HSDSB21-197).

Series 1, 1A (25013, 037 and 058), 1B, 1B-522,1B/R-522, 1B/S-522 (25090) and 3B (25015, 062and 069).

SB 21-3377 Jul 2000 1 M 21 Air Conditioning - Installation of improved airconditioning duct sleeves and clamps

Hawker 800XP. Only Hawker 800 U-125A(JASDF). Only BAe 125 Series 800A majorvariant C-29A and U-125

SB 21-34 Dec 1970 1 O 21 Temperature Control. To introduce HSDMod.CC/B8230 to tempcontrollerB01A213020A (HSD SB21-217).

Series 1, 1A (25013, 037 and 058), 1B, 1B-522,1B/R-522, 1B/S-522 (25090) and 3B (25015, 062and 069).

SB 21-3414 Jul 2000 1 M 21 Removal of air conditioning duct sleevebedding strips

Hawker 800XP. Hawker 800XP. Only Hawker 800major variant U-125A (JASDF), which haveaccomplished Mandatory Service Bulletin21-3377. Only BAe 125 Series 800A major variantC-29A and U-125, which have accomplishedMandatory Service Bulletin 21-3377. BAe

SB 21-3419 Aug 2000 - R 21 Air Conditioning - Replacement of low limittemperature control sensor

Hawker 800XP

SB 21-3424 Mar 2003 - M 21 AIR CONDITIONING - Pressure RegulatorShutoff Valve Wiring Modification

All BAe 125 1000A/1000B and Hawker 1000aircraft.

SB 21-3443 Feb 2008 4 R 21 Air Conditioning - Installation of ReinforcingBands in Air Conditioning Ducts

BAe.125 Series 800A(C-29A); BAe.125 Series800A(U-125); Hawker 800XP and Hawker 850XPPre-Mod 25G072A; Hawker 800(U-125A)Pre-Mod 25G072B; All Hawker 1000; Hawker900XP Pre-Mod 25G072A; Hawker 750 Pre-Mod25G072A. If you are no longer in possession ofthe airplane, please forward this information to thepresent owner.

SB 21-3485 May 2003 1 R 21 Introduction of an Inline filter to the lowtemperature control valve

Hawker 800XP with Honeywell GTCP36-150 APUinstalled per STC #ST00459NY





SB 21-35 Dec 1970 1 O 21 Temperature Control. To introduce HSDMod.CC/B8947 to temp controllerB01A213020A (HSD SB21-149).

Series 1, 1A (25013, 037 and 058), 1B, 1B-522,1B/R-522 and 3B (25015, 062 and 069).

SB 21-36 Nov 1970 1 O 21 Temperature Control. To introduce HSDMod.CC/B8953 to temp controllerB01A213020A (HSD SB21-208).

Series 1, 1A (25/013, 037 and 058), 1B, 1B-522,1B/R-522, 1B/S-522 (25/090) and 3B (25015, 062and 069).

SB 21-3621 Jan 2004 - O 21 Air Conditioning - Pressurization ControlSystem Modification

Hawker 800XP, Serials 258266, 258277 through258639 equipped with Honeywell GTCP36-150APU installed per STC #ST00459NY.

SB 21-3669 Dec 2004 - M 21 Air conditioning - Fan venturi motorreplacement

This Service Bulletin applies to the followingpre-Mod 253514A aircraft:DH.125 Series 1A;HS.125 Series 1B; DH.125 Series 1A-522;HS.125 Series 1B-522; DH.125 Series 1A/R-522;HS.125 Series 1B/R-522; DH.125 Series1A/S-522; HS.125 Series 1B/S-522; DH.12

SB 21-3699 Mar 2005 - M 21 Air Conditioning - Outflow/Safety valve adaptorinspection/replacement

Hawker 800XP, Serial Numbers 258566 through258609, 258611 through 258628 and 258630through 258677. Hawker 800 (U-125A), SerialNumbers 258513, 258533 and 258610.

SB 21-37 May 1966 - O 21 Temperature Control. To change Pye toggleswitch on the initiation valve circuit from 3 to 2position type.

Series 1, 1A, 1B, and 3 aircraft without Mod.255437

SB 21-38 Dec 1970 1 R 21 Pressurization Control. Safety & inward reliefvalve 525010. Introduction of NormalairMod.62PC SB 21-236.

Series 1

SB 21-3802 Aug 2006 - O 21 Air Conditioning - Installation of Drain in Pilot'sAir Outlet Duct

Hawker 800XP and Hawker 850XP, SerialNumbers 258266 and 258277 through 258782.

SB 21-3828 Mar 2007 - O 21 Air Conditioning - Pneumatic Relay Bracketand Tubing Replacement

Raytheon Aircraft Model 400A Beechjet, SerialsRK-1 through RK-353; Raytheon Aircraft Model400A (Hawker 400XP), Serials RK-354 throughRK-514.

SB 21-3844 Aug 2007 - O 21 Air Conditioning - Modification of AirConditioning Forward and Aft EvaporatorModules, P/N 1134310-1 and P/N 1134310-3

Hawker Beechcraft Model 400A, Serials RK-98,RK-110 through RK-539 with P/N 1134310-1 orP/N 1134310-3 air conditioning evaporatorassemblies installed.

SB 21-39 Dec 1970 1 R 21 Introduction of Teddington Mod.C1917 Toinitiation valve FMP/A/5178 (TeddingtonSB21-70).

Series 1, 1A (25/013, 037 and 058), 1B, 1B-522,1B/R-522, 1B/S-522 (25/090) and 3B (25/015,062 and 069).





SB 21-4 Jan 1965 1 O 21 To introduce latest linkage assembly andtemperature control valve auto-transformer andreference unit.

Series 1, 1A and 1B

SB 21-40 Dec 1970 1 I 21 Introduction of Teddington Mod.C1888 toinitiation valve FMP/A/5178 (TeddingtonSB21-74).

Series 1, 1A (25/013, 037 and 058), 1B, 1B-522,1B/R-522, 1B/S-522 (25/090) and 3B (25/015,062, 069).

SB 21-41 Dec 1970 1 O 21 Initiation Air Bleed Valve Assy FMP/A/5178. Tointroduce Teddington Mod.C1839 (TeddingtonSB21-23).

Series 1, 1A (25/013, 037 and 058), 1B, 1B-522,1B/R-522, 1B/S-522 (25/090) and 3B (25/015,062, 069).

SB 21-42 Dec 1970 1 O 21 Introduction of Teddington & HSD Mod. C1877to initiation valve FMP/A/5178.


SB 21-43 Dec 1970 1 O 21 Temperature control. To introduce temperatureselector B00A213032A in lieu ofB03A213471A.

Series 1, 1A, 1A-522, 1B and 3B (25015, 062 and069).

SB 21-44 Dec 1970 1 I 21 Temperature control. Link assy A2-04820A. Tointroduce HSD Mod.CC/B8364 HSD SB36-45.

Series 1, 1A (25/013, 037 and 058), 1B, 1B-522,1B/R-522, 1B/S-522 (25/090) and 3B (25015, 062and 069).

SB 21-45 Dec 1970 1 I 21 Temperature control. Temp controllerB01A213020A. To introduce HSDMod.CC/B8949 (HSD SB21-202).

Series 1, 1A (25/013, 037 and 058), 1B, 1B-522,1B/R-522, 1B/S (25/090) and 3B (25/015, 062and 069).

SB 21-47 Nov 1970 1 I 21 Temperature Selector B00A213032A. Tointroduce HSD Mod.CC/B8125 (HSDSB21-191).

Series 1, 1A (25/013, 037 and 058) 1B, 1B/R-522,1B/S-522 (25/090) and 3B (25/015, 062 and 069.

SB 21-48 Nov 1970 1 I 21 Temperature Control. Introducing HSDMod.CC/B9282 to cold air unit B00A216003A(HSD SB21-223).


SB 21-49 Nov 1970 1 I 21 Temperature Control. Cold air unitB00A216003A. To introduce HSDMod.CC/B5843 SB21-228.

Series 1, 1A (25/013, 037 and 058), 1B, 1B-522,1B/R-522, 1B/S-522 (25/090), 3B (25/015, 062and 069).

SB 21-5 Dec 1965 2 O 21 To introduce soleniod operated fresh air valve. Series 1, 1A and 1B.

SB 21-50 Nov 1970 1 I 21 Temperature Control. Cold air unitB00A216003A. Introducing HSDMod.CC/B9237 SB21-228.

Series 1, 1B, 1B/R-522, 1B/S-522 (25/090), 1A(25/013, 037, 058) and 3B (25/015, 062, 069).





SB 21-51 Nov 1970 1 I 21 Temperature Control. Duct sensing elementB01A213077A. To introduce HSD ModCC/B9296 SB21-230

Series 1, 1A (25/013, 037, 058), 1B, 1B-522,1B/R-522, 1B/S-522 (25/090) and 3B (25/015,062 and 069)

SB 21-52A Nov 1970 1 O 21 Temperature Control. To introduce HSDMod.CC/B8962 to auto transformersB03A213007A (SB21-236).


SB 21-52B Nov 1970 1 O 21 Temperature Control. To introduce HSDMod.CC/B8962 to auto transformersB00A213025A (SB21-237).


SB 21-53 Nov 1970 1 I 21 Introduction of Teddington Mod.C2093(SB21-68) to initiation valve FMP/A/5178.


SB 21-54 Nov 1970 1 I 21 Temperature Control. Cold air unitB00A216003A. To introduce HSDMod.CC/B7119 SB21-229.


SB 21-55 Nov 1970 1 I 21 Introduction of Hawker Siddeley DynamicsMod.CC/B 7610 (duct sensing element).


SB 21-56 Aug 1966 - R 21 Temperature Control. Change the cabinoverheat warning light to a 'PRESS TO TEST'type.

Series 1B 3 3B

SB 21-57 Aug 1966 - R 21 NRV Pt No AWE124-51 - Fracture of butterflycarrier arms.

Applicable to HS.125 Series 1, 1B, 3 and 3Baircraft plus aircraft 013.

SB 21-58 Nov 1970 1 O 21 Temperature Control. Introducing HSDMod.CC/B8881 to Temprature ControllerB01A213020A (HSD SB21-266).


SB 21-59 Nov 1970 3 R 21 Distribution. To introduce wire mesh guard toRH cabin air duct downstream of non-returnvalve at pressure dome.

Series 1, 1B, 1B-522, 1B/R-522, 1B/S-522, 3Band 1A (25/013, 037, 058).

SB 21-6 Jan 1965 - O 21 Introduction of separate bracket for dischagerate controller on frame 19.

Series 1, 1A and 1B

SB 21-60 Nov 1970 1 O 21 Introduction of HSD Mod.CC/B9580 to massflow controller B00A214017A (HSD SB21-282).

Series 1, 1A, (25/013, 037, 058), 1B, 1B-522,1B/R-522, 1B/S-522 (25/090) and 3B (25/015,062, 069)





SB 21-61 Nov 1970 1 I 21 Introduction of Teddington Mod.C2171 oninitiation valve FMP/A/5178.

Series 1, 1A (25/013, 037, 058), 1B, 1B-522,1B/R-522, 1B/S-522 (25/090) and 3B (25/015,062, 069)

SB 21-62 Nov 1970 1 O 21 Introduction of HSD Mod.CC/B9333 (SB21-277) to mass flow controller B00A214017A.

Series 1, 1A (25/013, 037, 058), 1B, 1B-522,1B/R-522, 1B/S-522, (25/090) and 3B (25/015,062, 069)

SB 21-63 Nov 1970 1 I 21 Introduction of HSD Mod.CC/B9597 (SB21-283) to mass flow controller B00A214017A.

Series 1, 1A, (25/013, 037, 058), 1B, 1B-522,1B/S-522 (25/090) and 3B (25/015, 062, 069)

SB 21-64 Nov 1970 1 I 21 Introduction of Teddington Mod.C2186(SB21-79) on initiation valve FMP/A/5178.

Series 1, 1A (25/013, 037, 058), 1B, 1B-522,1B/R-522, 1B/S-522 (25090) and 3B (25/015,062, 069).

SB 21-65 Nov 1970 2 O 21 Introduction of Mod.C2183 to initiation valveFMP/A/5178 .

Series 1, 1B, 1B/R-522, 1B/S-522 (25/090), 1A(25/013, 037, 058) and 3B (25/015, 062, 069).

SB 21-66 Nov 1970 1 I 21 Temperature Controller B01A213020A.Introducing HSD Mod.CC/B8967 (SB 21-296).

Series 1, 1B, 1B/R-522, 1B/S-522 (25/090), 3B(25/015, 062, 069) and 1A (25/013, 037, 058).

SB 21-67 Jan 1967 - O 21 Introduction of silencer duct for flood flowsupply in lieu of standard duct.

Series 1B and 3B with Mod.251600 embodied.

SB 21-68 Nov 1970 1 O 21 Introduction of non-return valve AWE124-50Cin lieu of WE124-50A. (HSD Mod.28220).

Series 1, 1B, 1B-522, 1B/R-522, 1B/S-522(25/090, 1B/R-522 (094), 1B/S-522 (090), 3B(015, 062, 069) and 1A (013, 037, 058).

SB 21-69 Nov 1970 1 O 21 Introduction of HSD Mod.CC/B9420 to valveB01A214015A.


SB 21-7 Dec 1970 2 I 21 To introduce Dunlop Mod.M185 to pressureswitch ACM22232.

Series 1, 1A (25/013, 037, 058) and 1B

SB 21-70 Apr 1969 1 O 21 Pressurization Control. To introduce a modifiedvalve in the pressure control system.

Series 1A, 1B, 3A and 3B (Post Mod.251600aircraft).

SB 21-71 Jan 1967 - R 21 Check for faulty elbow ducts in No.2 supply toheat exchanger.

Applicable to HS.125 aircraft Series 1, 1A, 1B, 2and 3.

SB 21-73 May 1967 - R 21 Temperature Control. To prevent in linenon-return valve being assembled the wrongway in ducts.

Series 1B post-mod.251600, 3 and 3B.

SB 21-74 Jun 1970 2 R 21 Air Conditioning - Air Supply and Distribution -Ram Air Duct Fractured

Applicable to HS.125 aircraft Series 1A, 3A, 3B,3A/RA, 3B/RA and 1B.





SB 21-76 Nov 1970 1 O 21 Distribution. To introduce HSD Mod.28333 tonon-return valve GE 124/33.

Series 1 1A (25/013, 037, 058), 1B, 1B-522,1B/R-522 (25/094), 1B/S-522 (25/090), 3B(25/015, 062, 069)

SB 21-77 Jul 1967 - R 21 Duct installation bleed air supply(Mod.251600). Incorrect torque loading ofclamps C6045-30H.

Applicable to HS.125 aircraft, Series 1A, 3A and3B.

SB 21-78 Nov 1967 - O 21 Introduction of modified branch pipe givingclearance for discharge valve control cable.

Series 1A (A/C 25013) 1B

SB 21-79 Nov 1970 1 I 21 Temperature control. To introduce HSDMod.CC/B9825 to cold air unit B00A216003A(HSD SB21-342).

Series 1 1A (A/C 25013) 1B (except A/C 25097)3B (A/C 25062 069)

SB 21-8 Nov 1964 - I 21 To introduce Armstrong Whitworth non-returnvalve AWE 124/28B in lieu of AWE 124/28A.

Series 1 1B

SB 21-80 Nov 1970 2 O 21 Temperature control. To introduce HSDMod.28188 to NRV AWE12455.

Series 1 1A (A/C 25013 037 058) 1B 1B/R 1B/S(A/C 25090) 3B (A/C 25015 062 069)

SB 21-81 Aug 1968 1 R 21 Introduction of retrospective modification to theinverter discharge duct assembly.

Series 1A 3A 3B

SB 21-82 Nov 1970 1 I 21 Temperature control. To introduce HSDMod.28332 to NRV AWE12455 (HSDSB21-351).


SB 21-83 May 1968 - I 21 To introduce Cabin Pressure Controller102464-16-2 in lieu of 102464-16-1.

Series 1B/S (A/C 25097) 3A 3B 3A/R 3A/RA 3B/R3B/RA

SB 21-84 Jul 1968 - R 21 Duct installation bleed air supply. Failure ofpipe connection at coupling in auxiliary heatsupply pipeline.

Series 1A 3A 3B 3B/R 3B/RA (A/C 25097)

SB 21-85 Sep 1970 3 O 21 Compression. To introduce silencer in cabin airsupply ducting.

Series 1B/S 3A 3B 3A/R 3A/RA 3B/R 3B/RA (A/C25097) 400

SB 21-86 Feb 1969 - I 21 To introduce cooling turbine 203880-2-2 in lieuof 203880-2-1 (Part of refrigerator unit Assy682840).

Series 1A 1A/S 1B 1B/S 3A 3B 3A/R 3A/RA3B/RA (A/C 25097) 400

SB 21-87 Oct 1970 1 O 21 To introduce HSD NRV AWE124-55B in lieu ofAWE124-55A (HSD Mod 28509).


SB 21-88 Oct 1970 1 I 21 To introduce Teddington Mod C2353 tobutterfly valve FMP/A/5178






SB 21-89 Nov 1971 2 R 21 Temperature control. To introduce HSDMod.CC12118 to temprature controllerBA213020A for Series with HSD Airconditioning.

Series 1 1A 1B 1B/R 1B/S 3B (A/C 25015 062069)

SB 21-9 Dec 1970 1 I 21 Introduces miscellaneous Mods. To full- hotbypass valve BA2-14016A.


SB 21-90 Nov 1971 - O 21 Ductstat/temperature controller - Pt A-DuctstatBA213021A to change resistors Pt B-TempBA213020A controller to change.

Series 1 1A (A/C 25013 037 058) 1B 1B/R-5221B/S-522 3B

SB 21-91 Jul 1970 - O 21 Flood flow duct. Deletion of thermostat toelimate the excessive time taken for the roofduct warning lamp to extinguish.

Series 1B/S-522 3B 3B/RA

SB 21-92 Nov 1971 - I 21 Temperature controller BA213020A - Toreplace capacitor C6b on front tag board byimproved capacitor C6.

Series 1 1-521 1A (A/C 25013 037 058) 1B1B-522 1B/R-522 1B/S-522 3B

SB 21-93 Jan 1972 - R 21 Temperature controller BA213020A. Toimprove heat dissipation of transistors on topchassis & heat insulation of front tag board(HSD Mod.CC12147).

Series 1 1-521 1A 1B 1B-522 1B/R-522 1B/S-5223B

SB 21-94 Sep 1971 - R 21 Ground Pressurisation connector WGE133/2.Nylon cable retaining blanking cap shortenedConnector becomes WGE133/2A.

Series 1A 1A-522 1A/S-522 1B 1B-522 1B/R-5221B/S-522 3A 3A/R 3A/RA 3B 3B/RA 400A 400B

SB 21-95 Oct 1971 2 R 21 System aft of perssure dome - longer sleevesat inlet and outlet connections to waterseparator and outlet of heat exchanger.

Series 1B/S-522 3A 3A/R 3A/RA 3B 3B/RA 400

SB 21-96 Mar 1971 - R 21 Temperature control piping. New pipeintroduced incorporating fixed length linksacross coupling immediately upstream of heatvalve.

Series 1B/S-522 3A 3A/R 3A/RA 3B 3B/RA 400

SB 21-98 May 1972 - I 21 Introduction of reduced width ducts & modifiedbifurcated duct in windshield demist ducting.

Series 400A 400B

SB 21-99 Mar 1972 - O 21 Inward relief door in ram air duct. Twoadditional springs added on hinge line.

Series 1A-522 1A/S-522 1B/S-522 3A 3A/R3A/RA 3B 3B/RA 400

SB 21-A150 Feb 1994 - M 21 Inspection of fan venturi motor for clearancewith adjacent equipment and signs ofoverheating

Series 1 to 700 Pre Mod.253514A 800 PreMod.253514A 1000 Pre Mod.2535114A





ATA Chapter 22Auto Flight

SB 22-11 Jul 1978 - R 22 Inhibits linear deviation mode to preventinstability which can occur when in VOR mode.

Model HS.125 Series 700 and all variants.

SB 22-12 Nov 1991 - M 22 Introduction of flight control computer (FCC-86)part number 622-6195-315 in lieu of622-6195-015 or 622-6195-215.

All Series 800 aircraft with Collins flight controlcomputer (FCC-86) part number 622-6195-015 or622-6195-215.

SB 22-13 Jan 1996 - R 22 Restricted - See Remarks Hawker 800 U-125A (A/C 258245, 258247,258250

SB 22-14 Dec 1995 - M 22 Auto Flight - To introduce a modified Mach trimcomputer, Part Number 822-0872-001 Mod. 1

Hawker 800XP

SB 22-2 Apr 1966 - O 22 Introduces additional cable adjustment onaileron autopilot controls at frame 7.


SB 22-3 Dec 1969 - 22 Re-orientation of mounting bracket for elevatorservo connector

SB 22-3 - INSP Jan 1968 - R 22 Inspection of Connector Plugs in Elevator &Rudder Primary Servo Motor Assemblies forMoisture (Collins type 334C3) Mod 251974

Model HS.125 Series 1, 1B, 1B-522, 1B/R-522,1B/S-522, 3B and 3BRA. Model DH.125 1A,1A-522, 1A/S-522, 3A, 3AR, 3ARA.

SB 22-3577 Jul 2003 - O 22 AUTO FLIGHT - Introduction of Improvementsto Honeywell FZ-800 Flight GuidanceComputer

BAe.125 Series 800A, 800B, Hawker 800 andHawker 800XP, Serials 258001 through 258566equipped with Honeywell FZ-800 Flight GuidanceComputer (FGC), P/N’s 7003974-713 and7003974-728 installed in accordance with STC’sSA5937SW, ST09537SC or ST09623SC.

SB 22-3764 Dec 2005 - R 22 Autoflight - Modification of FCC-4007 Cards Model 400A Beechjet, Serials RK-118, RK-140through RK-353; Model 400A Hawker 400XP,Serials RK-354 through RK-473.

SB 22-7 Mar 1971 - R 22 Potentiometer Position Transmitter. 104PPt/BU/1 Improved locking of input shaft taperpin. (Smiths Mod.04 SB24-131).

Model HS.125 Series 400B

SB 22-8 Sep 1972 - O 22 Introduces second flight system (CollinsFD108) with navigation compass and gyroswitch.

This modification is to Special Order Only foraircraft constructors Serial No. 25/44





SB 22-A1 Jan 1966 2 M 22 Auto-Pilot - Required Placards - Flightrestrictions with autopilot engaged

This Alert Service Bulletin is appicable to H.S.A.125 Series 1, 1A, 1B, aircraft equipped withCollins Autopilot Equipment.





ATA Chapter 23Communications

SB 23-1 Sep 1966 - O 23 HF system Collins 18S4C. Frequency Selector.Introduction of 165-LRU-45J.

SB 23-10 Apr 1974 - R 23 HF aerial lead in cable support andsoundproofing restraint added to reducepossible fracture of the HF lead in cable.

Series 3B (A/C 25113 117) 3B/RA (A/C 25147162 165 to 168)

SB 23-11 Mar 1975 2 O 23 To introduce Lear Jet A250 stereo radio/tapereproducing system.

Model BH.125, Series 600B

SB 23-12 Oct 1974 - O 23 Intercomm R/T Autopilot. To facilitate switchreplacement in line connectors are fitted tocables in control column boss.

Model DH.125, Series 1A-522, 1A/S-522, 3A,3A/R, 3A/RA and 400A. Model BH.125, Series400A and 600A. Model HS.125, Series 1, 1-521,1B, 1B-522, 1B/R-522, 1B/S-522, 3B, 3B/RA,400B, 401B, 403B and 600B.

SB 23-13 Oct 1974 - R 23 Intercommunications-To prevent loss of pilotsand co-pilots intercom in the event of relay orswitch failure.

Series 1, 1A, 1B, 1B-522 and 3B

SB 23-16 Jun 1975 - O 23 Cabin Stereo Radio/Tape System. To provideimproved access for fuse replacement.

Model BH.125, Series 600A and 600B.

SB 23-2 Aug 1967 - R 23 VHF System. To introduce 33 ohms resistor inPress to Test transmit line of Collinstransceiver 618M-1.

Series 1B and 3B

SB 23-20 Feb 1980 - R 23 Fairchild A100 Cockpit Voice Recorder.Omission of thermal insulation (Fairchild SBCVR A140 refers).

Applicable to all HS/DH/BH 125 aircraft equipedwith the Fairchild A100 Cockpit Voice recorder upto and including Series 700.

SB 23-21 Nov 1983 2 M 23 Communications - ESB31 and EA76 - Audiointegrating systems - Segregation of powersupplies

This Service Bulletin is applicable to Series 1, 3and all variants.

SB 23-21AA Mar 1983 - M 23 Communications - ESB31 and EA76 - Audiointegrating systems - Segregation of powersupplies

Series 400 (A/C 25215 219 223 231 235 238 240246 247 251 to 253, 257 270 274) Series 600(A/C 25258)

SB 23-21AB Mar 1983 - M 23 Communications - ESB31 & EA76 AudioIntegrating Systems - Segregation of powersupplies

Series 400 (A/C 25217)





SB 23-21AC Mar 1983 - M 23 Communications - ESB31 & EA76 AudioIntegrating Systems - Segregation of powersupplies

Series 400 (A/C 25242 272)

SB 23-21AD Mar 1983 - M 23 Communicatinos - ESB31 & EA76 AudioIntegrating Systems - Segregation of powersupplies

25277,288,289 and 290

SB 23-21AE Mar 1983 - M 23 Communications - ESB31 & EA76 AudioIntegrating Systems - Segregation of powersupplies

Series 400 (A/C 25277 288 289 290)

SB 23-21AF Mar 1983 - M 23 Communications - ESB31 and EA76 - Audiointegrating systems - Segregation of powersupplies

Series 600 (A/C 256005 012 015 015 017 019021 024)

SB 23-21B Mar 1983 - M 23 Communications - ESB31 and EA76 - Audiointegrating systems - Segregation of powersupplies

Series 1 (A/C 25005)

SB 23-21C Mar 1983 - M 23 Communications - ESB31 and EA76 - Audiointegrating systems - Segregation of powersupplies


SB 23-21D Mar 1983 - M 23 Communications - ESB31 and EA76 - Audiointegrating systems - Segregation of powersupplies


SB 23-21E Mar 1983 - M 23 Communications - ESB31 and EA76 - Audiointegrating systems - Segregation of powersupplies

Series 1 (A/C 25009 010 025 058)

SB 23-21F Mar 1983 - M 23 Communications - ESB31 and EA76 - Audiointegrating systems - Segregation of powersupplies


SB 23-21G Mar 1983 - M 23 Communications - ESB31 & EA76 AudioIntegrating Systems - Segregation of powersupplies


SB 23-21H Mar 1983 - M 23 Communications - ESB31 and EA76 - Audiointegrating systems - Segregation of powersupplies


SB 23-21I Mar 1983 - M 23 Communications - ESB31 and EA76 - Audiointegrating systems - Segregation of powersupplies

25080





SB 23-21J Nov 1983 2 M 23 Communications - ESB31 and EA76 - Audiointegrating systems - Segregation of powersupplies


SB 23-21K Nov 1983 2 M 23 Communications - ESB31 and EA76 - Audiointegrating systems - Segregation of powersupplies


SB 23-21L Mar 1983 - M 23 Communications - ESB31 and EA76 - Audiointegrating systems - Segregation of powersupplies

Series 1 (A/C 25085 090 092 105 106)

SB 23-21M Mar 1983 - M 23 Communications - ESB31 & EA76 AudioIntegrating Systems - Segregation of powersupplies


SB 23-21N Mar 1983 - M 23 Communications - ESB31 & EA76 AudioIntegrating Systems - Segregation of powersupplies

Series 3B (A/C 25069)

SB 23-21P Mar 1983 - M 23 Communications - ESB31 & EA76 AudioIntegrating Systems - Segregation of powersupplies


SB 23-21Q Mar 1983 - M 23 Communications - ESB31 & EA76 AudioIntegrating Systems - Segregation of powersupplies

Series 3 (A/C 25116 117 128)

SB 23-21R Mar 1983 - M 23 Communications - ESB31 & EA76 AudioIntegrating Systems - Segregation of powersupplies


SB 23-21S Mar 1983 - M 23 Communications - ESB31 & EA76 AudioIntegrating Systems - Segregation of powersupplies

Series 1 (A/C 25127 130 131 133 138 140 143 to145, 147 150 154 157)

SB 23-21T Mar 1983 - M 23 Communications - ESB31 & EA76 AudioIntegrating Systems - Segregation of powersupplies

Series 3 (A/C 25162 165 167 168)

SB 23-21U Mar 1983 - M 23 Communications - ESB31 & EA76 AudioIntegrating Systems - Segregation of powersupplies


SB 23-21V Mar 1983 - M 23 Communications - ESB31 & EA76 AudioIntegrating Systems - Segregation of powersupplies

Series 3 (A/C 25169 171)





SB 23-21W Mar 1983 - M 23 Communications - ESB31 & EA76 AudioIntegrating Systems - Segregation of powersupplies


SB 23-21X Mar 1983 - M 23 Communications - ESB31 & EA76 AudioIntegrating Systems - Segregation of powersupplies

Series 400 (A/C 25184)

SB 23-21Y Mar 1983 - M 23 Communications - ESB31 & EA76 AudioIntegrating Systems - Segregation of powersupplies

Series 400 (A/C 25178 189 194 209)

SB 23-21Z Aug 1983 1 M 23 Communications - ESB31 & EA76 AudioIntegrating Systems - Segregation of powersupplies

Series 400 (A/C 25197 199)

SB 23-22 Jun 1984 - O 23 To eliminate interference on pilot's andco-pilot's intercoms when 3rd crew memberpress to talk is operated.

Series 700B (A/C 257118 127 130 133 136 139142 145 151 158 160 163)

SB 23-23 May 1987 - M 23 HF Aerial System. Possible cable overheat andsystem degradation.

Applicable to BAe/DH/BH/HS 125 Series 800Aand 800B

SB 23-24 Feb 1989 - R 23 To introduce Replacement main PCB assemblyBAM 2 Video monitor.

Series 800B

SB 23-25 Oct 1989 - O 23 Communications To Introduce modified linereplacement units for PTR1751 UHF radio (ARI23301) to enable 25 kHz channel spacing

Series 400B, 600B and 700B

SB 23-26 Sep 1989 - R 23 Restricted - See Remarks Series 800A (A/C 258129)

SB 23-27 Nov 1989 - R 23 Restricted - See Remarks Series 800A (A/C 258129 134)

SB 23-28 Dec 1990 - I 23 Central Audio Unit. Deletion of redundantcapcitor from station selector boards of CAunits AA15504-1, AA15504-2 and AA15504-11.

Series 700B and 800B

SB 23-29 Apr 1994 - I 23 Communications - To interchange the No.1 andNo.2 VHF COMM antennas

BAe 125 Series 1000B

SB 23-30 Apr 1991 - O 23 Restricted - See Remarks Series 800B

SB 23-31 Jan 1992 - R 23 Inspection of antenna coupler mount to identifysuspected incorrect material.

Applicable to BAe 125 aircraft 800 Seires fittedwith Rockwell Collins HF Radio system 628T-3.

SB 23-3121 Dec 1997 - O 23 Restricted - See Remarks Hawker U-125A (JASDF) aircraft





SB 23-3140 Dec 1997 - O 23 Restricted - See Remarks Hawker 800 U125A, a/c 258245, 258247,258250, 258268, 258288.

SB 23-3190 Oct 2000 - O 23 Communications - Reduction of inter-comaudio noise in aircraft equipped with HoneywellAudio Systems

Hawker 800XP

SB 23-32 Nov 1993 - R 23 Restricted - See Remarks Series 800A C29A (A/C 258129, 258131, 258134,258154, 258156, 258158.

SB 23-3263 Aug 1999 1 O 23 International Civil Aviation Organization (ICAO)Requirement for 8.33 kHz VHF Comm Spacing(Honeywell)

BAe 125 Series 800A, Hawker 800 and Hawker800XP, equipped with Honeywell Primus IIIntegrated Radio System, and HoneywellNZ-2000 FMS with Software version 5.2.

SB 23-3264 Jul 1999 - O 23 International Civil Aviation Organization (ICAO)Requirement for 8.33 KHZ VHF Comm Spacing(Raytheon Aircraft Company STCST00780WI-D) (Collins)

BAe 125 Series 800 and Hawker 800, equippedwith Collins Pro Line II avionics, (CTL-22 VHFComm Control Heads and VHF-22A/BTransceivers)

SB 23-3294 May 1999 - R 23 Restricted - See Remarks Hawker 800 (U-125A) JASDF, Serials 258245,258247, 258250, 258268, 258288, 258305,258306, 258325, 258333 and 258341.

SB 23-33 - O 23 Restricted - See Remarks Model Bae 125 Series 800A U-125

SB 23-3313 May 1999 - R 23 Communications - To provide 8.33 kHz spacingand VHF COMM FM immunity for the dual VHFcommunications system

Model BAe 125 Series 700B

SB 23-3327 Jul 1999 - O 23-10 Communications - International Civil AviationOrganization (ICAO) Requirement For 8.33KHZ VHF Comm Spacing

Beechjet Model 400A, Serials RK-118, RK-140 &after when equipped with Collins AMS-5000avionics.

SB 23-3357 Nov 2000 1 O 23 Communications - International Civil AviationOrganization (ICAO) requirement for 8.33 kHzVHF Comm Spacing (Raytheon AircraftCompany STC ST09571SC) (Collins)

BAe 125 Series 800, Hawker 800 and Hawker800XP, equipped with Collins Pro Line II avionics,(RTU-870T Radio Tuning Units and VHF-422Transceivers).

SB 23-3398 Jun 2001 - R 23 Communications - Collins HF CommunicationsTransceiver 'CW' Mode Modification

BAe 125 Series 800A, Major Variant C-29A.BAe125 Series 800A, Major Variant U-125.

SB 23-34 Jan 1995 - O 23 To introduce VHF Communication System(VHF-21A) on aircraft with Gables G6692-01 orG6950-3 controller

Model BAe 125 Series 800B.





SB 23-35 Jul 1996 1 O 23 Communications - To introduce VHFCommunication System (VHF-22A) PartNumber 622-6152-011 on aircraft with GablesG6868-04 or Collins CTL-22 controller


SB 23-3694 Feb 2005 1 M 23 Communications - Cockpit Audio Modification Hawker 800XP, Serial Numbers 258541, 258556,258567 through 258609, 258611 through 258628,258630 through 258669 and 258671 through258678.

SB 23-3727 May 2005 - M 23 Communications - Control Column MicrophoneJack Modification

Raytheon Aircraft Company (RAC) Arkansas STCSA4900SW installed on the followingaircraft:Bombardier Challenger ModelCL-600-1A11, Serials 1054, 1059, 1069, 1071and 1080;Bombardier Challenger ModelCL-600-2A12, Serials 3012, 3013, 3034, 3045,3050, 3051, 3061 and 3065;BombardierChallenger Model CL-600-2B16, Serials 5012,5046 and 5060. Any other Challenger ModelCL-600 aircraft with RAC Arkansas STCSA4900SW installed except Serial 3025.

SB 23-3749 Aug 2005 - O 23 Communication - VHF Communication(COMM) 2 Antenna Kit

Hawker 800XP, Serial Numbers 258717 and258723 through 258743.

SB 23-39 Apr 1996 - O 23 Communications - To introduce VHFcommunication system (VHF-21A) on aircraftwith Gables G5708A controller.


SB 23-4 Jan 1969 - R 23 HF wire aerial installation Chelton HF aerial clipin lieu of brazed ring (Chelton SB23-1).

Series 1, 1A, 1A-522, 1B, 1B-522, 1B/S-522, 3A,3B, 3A/R, 3A/RA, 3B/RA, 400A and 400B

SB 23-43 Jan 1995 - I 23 Restricted - See Remarks BAe 125 Series 800A U-125 (258215, 258227,258242)

SB 23-44 Mar 1995 - R 23 Communications - Inspection of King HFsystem for correct connection for tuning tofrequencies below 4MHz.

Applicable to BAe 125 Series 800A, 800B andHawker 800.

SB 23-45 May 1995 - O 23 Communications - To provide a 'Phones Only'facility at the P1 and P2 positions

BAe 125 Series 800B

SB 23-47 Jan 1996 - O 23 Restricted - See Remarks Hawker 800 U-125A (258245, 258247, 258250)


SB 23-49 Jan 1996 - O 23 Restricted - See Remarks HAWKER 800 U-125A (258245, 258247, 258250)





SB 23-5 May 1969 - O 23 VHF. To introduce supressed aerial in overfinto reduce drag.

Series 1, 1A, 1A-522, 1A/S-522, 1B, 1B-522,1B/R-522, 1B/S-522, 3A, 3B, 3A/R, 3A/RA and3B/RA.

SB 23-50 Feb 1996 - I 23 Restricted - See Remarks HAWKER 800 U-125A (258245, 258247, 258250)

SB 23-51 Feb 1996 - O 23 Restricted - See Remarks HAWKER 800 U-125A (258245, 258247, 258250)

SB 23-52 Sep 1996 1 M 23 Communications - Inspection of the HFcommunications system for possibleinterference with the fuel quantity indicators.

Applicable to BAe 125 Series 1000 and Hawker1000 aircraft fitted with HF radio communicationsequipment.

SB 23-53 Nov 1996 - M 23 Restricted - See Remarks HAWKER 800 U-125A (JASDF): (258245,258247, 258250, 258268)

SB 23-6 Apr 1971 - I 23 Tape reproducer TP18A Mk2 PtA to addresistor (Tele Research Ltd Mod.10 SB23-10).Pt. B to change lead colour (Tele Research LtdMod.11 SB23-11).

Model HS.125, Series 1B, 1B-522, 1B/S-522, 3Band 3B/RA.

SB 23-7 Nov 1971 1 I 23 HF. To introduce Sunair ASB100HF CustomerRequest.

The aircraft affected is 25243.

SB 23-9 Mar 1974 - O 23 HF antenna spark gap. To improve installationand reduce the possibility of electricalbreakdown.

Model HS.125, Series 3B/RA and 400B.

SB 23-A3 May 1968 - R 23 Communications - H.F. Wire Aerial Installation(Chelton) - Tail Rod Link Cracked

HS.125 with Chelton Wire Aerial fitted





ATA Chapter 24Electrical Power

SB 24-1 Sep 1964 - O 24 To introduce angle bracket in panel DA formounting terminal block AU to improveaccessability.

Series 1

SB 24-10 May 1965 - O 24 DC Generation Improved battery hold downattachments. Wing bolts have been introducedin lieu of existing bolts and stiffnuts.

Series 1 and 1B

SB 24-100 Aug 1969 - I 24 Voltage Regulators. To introduce RotaxMod.4534U to static regulator U6112.

Series 1, 1A, 1A-522, 1A/S-522, 1B, 1B-522,1B/S-522, 3A, 3B, 3A/R, 3A/RA, 3B/RA, 400Aand 400B

SB 24-101 Aug 1969 - O 24 To introduce new Starter Generator AdaptorFlange Assy ZA19602/1 in lieu of ZA19602(Mod.251533).

Series 1, 1A, 1A-522, 1A/S-522, 1B, 1B-522,1B/S-522, 1B/R-522, 3A, 3B, 3A/R, 3A/RA,3B/RA, 400A and 400B

SB 24-102 Aug 1969 - I 24 Generator Switching Units. To introduce RotaxMod.SW6948 to generator switching unitF6812.

Series 1, 1A, 1A-522, 1A/S-522, 1B, 1B-522,1B/S-522, 1B/R-522, 3A, 3B, 3A/R,3A/RA, 3B/RA,400A and 400B

SB 24-103 Jul 1969 - R 24 Introduction of interim revised quality controlstandard for Leyland MGE23-400 inverters.

Series 1A , 1A-522, 1A/S-522, 3A, 3A/R, 3A/RA,3B/RA, 400A and 400B (Post Mod.251804)

SB 24-104 Feb 1970 1 R 24 Introduction of Leyland 2500VA inverterMGE23-413.

Series 1A, 1A-522, 1A/S-522, 3A, 3A/R, 3A/RA,3B/RA (Post Mod.251804), 400A and 400B

SB 24-105 Sep 1969 1 R 24 Introduction of Leyland 750VA inverterMGH182-100.

Series 1, 1A, (A/C 25037 and 25058) 1B, 1B-522,1B/S-522, 3B, 3B/RA, (Pre Mod. 251804)

SB 24-106 Sep 1970 1 O 24 DC Generation. To introduce six 3 amp fuses inlieu of circuit breakers in generator outputvoltage and ammeter lines.

Model DH 125, Series 3A/RA and 400A. ModelHS 125, Series 3B/RA and 400B

SB 24-108 Aug 1977 1 R 24 Electrical Power - Starter Generator, TypeBC.0107 - Malalignment of Mounting with theEngine (Mod 252081)

Model DH.125, Series 1A, 1A-522, 1A/S-522, 3A,3A/R, 3A/RA and 400A. Model HS.125, Series 1,1B, 1B-522, 1B/R-522, 1B/S-522, 3B, 3B/RA and400B

SB 24-109 Nov 1969 - O 24 Introduction of provisions to trigger the CAGsystem in the event of failure of 26 volt ACsupply.

Model HS.125, Series 3B/RA and 400B.





SB 24-11 Oct 1967 1 R 24 To introduce guard on battery/emergency startswitch.

Series 1, 1A less A/C 25096 and subs. 1A, 1Bless aircraft 25097, with mod.251197.

SB 24-110 Feb 1970 - I 24 Generator Switching Unit F6815 in lieu ofF6812. The GSU's on panel GA aresuperseded by new units to provide moreprotection.

Series 1 1A 1B 1B/R 1B/S 3B (A/C 25015)

SB 24-111 Nov 1970 - I 24 Busbar Protection Unit U3626. To introducechange of resistor on printed circuit board assyNo1 to reduce drift of overvoltage.

Model DH.125, Series 1A-522, 1A/S-522, 3A,3A/R, 3A/RA and 400A. Model BH.125, Series400A. Model HS.125, Series 1B/S-522, 3B,3B/RA and 400B.

SB 24-112 Nov 1970 - I 24 Generator Contactor D.11804. To introducecrinkle washers on terminal fixings of generatorcontactor (Rotax Ltd. Mod.4324-D).

Model DH.125, Series 1A and 1A-522. ModelHS.125, 1, 1-521, 1B, 1B-522, 1B/R-522,1B/S-522 and 3B.

SB 24-113 Jan 1970 - R 24 To identify circuit breakers and fuse on DAelectrical panel which may need to be trippedor removed in the event of electrical fire.

Model DH.125, Series 1A, 1A-522, 1A/S-522, 3A,3A/R, 3A/RA and 400A. Model HS.125, Series 1,1B, 1B-522, 1B/R-522, 1B/S-522, 3B, 3B/RA and400B

SB 24-114 Aug 1970 - O 24 Voltage Control Unit U8601/1. To introducenew triple capacitors to VCU in windscreende-icing system.

Model DH.125, Series 1A, 1A-522, 1A/S-522, 3A,3A/R, 3A/RA and 400A. Model BH.125, Series400A. Model HS.125, Series 1, 1-521, 1B,1B-522, 1B/R-522, 1B/S-522, 3B, 3B/RA and400B

SB 24-115 Oct 1971 1 O 24 Voltage Regulators. To introduce higher currentrated capacitors and improved incapsulation.

Model HS.125, Series 1. Model DH.125, 1A,1A-522, 1A/S-522 and 3A. Model HS.125, Series1, 1-521, 1B and 1B-522.

SB 24-117 Sep 1972 2 O 24 DC Generation. To revise circuit for 3rd batteryPt A - 3amp fuse replaced by 5amp Pt B -Battery rate increased Pt C - Mod to PEBusbar.

Model DH.125, Series 3A/RA and 400A. ModelBH.125, Series 400A. Model HS.125, Series3B/RA and 400B.

SB 24-119 Mar 1971 1 R 24 Introduction of new alternator brushgearassembly.

Model DH.125, Series 1A, 1-522, 1A/S-522, 3A,3A/R, 3A/RA and 400A. Model HS.125, Series 1,1-521, 1B, 1B-522, 1B/R-522, 1B/S-522, 3B,3B/RA and 400B

SB 24-12 Feb 1966 1 O 24 DC Generation. A new increased rating Berco30 watt 33 OHMS resistor in No.3 starterbattery circuit and anchorage battery lead.

Series 1, 1A and 1B





SB 24-121 Jun 1971 - O 24 Voltage Regulators U6112 & U6120 Insulationstrips are rivetted to inside face of cover oneach voltage regulator.

Model DH.125, Series 1A, 1A-522, 1A/S-522, 3A,3A/R and 400A. Model HS.125, Series 1, 1-521,1B, 1B-522, 1B/R-522, 1B/S-522, 3B, 3B/RA and400B.

SB 24-122 Dec 1970 - I 24 Resistor in 3rd Battery Charging CircuitWelwyn Resistor B1602 introduced asalternative to Berco Resistor VGH/KI.

Model DH.125, Series 1A, 1A-522, 1A/S-522, 3A,3A/R, 3A/RA and 400A. Model BH.125, Series400A. Model HS.125, Series 1, 1-521, 1B,1B-522, 1B/R-522, 1B/S-522, 3B, 3B/RA and400B.

SB 24-123 Jul 1970 - I 24 Starter/Generator Plated bolts for brush flextags introduced to prevent threads seizing inholders resulting in damage on bolt removal.

Model DH.125, Series 1A, 1A-522, 1A/S-522, 3A,3A/R, 3A/RA and 400A. Model HS.125, Series 1,1-521, 1B, 1B-522, 1B/R-522, 1B/S-522, 3B,3B/RA and 400B.

SB 24-124 Dec 1971 2 M 24 Electrical Power - Voltage Sensing Unit - Tointroduce voltage sensing unit U3624/2 in lieuof U3624 (Rotax Mod. SP.7172)

Model DH.125, Series 1A and 1A-522. ModelHS.125, Series 1, 1-521, 1B, 1B-522, 1B/R-522,1B/S-522 and 3B.

SB 24-125 Aug 1970 1 R 24 Panel ZK addition of two relays in start/selectcircuit minor wiring changes are made atpanels CG and DA in the flight compartment.

Model DH.125, Series 3A/RA and 400A. ModelHS.125, Series 3B/RA and 400B.

SB 24-126 Jan 1971 - O 24 Starter/Generator Adapter Flanges. New screwand bushing introduced to ensure startergenerator being securely attached to theengine.


SB 24-127 Dec 1970 - O 24 Voltage Control Unit U8601/1. Introducing newcapacitors diode and resistors to improve thereliability of the unit.

Model DH.125, Series 1A, 1A-522, 1A/S-522, 3A,3A/R, 3A/RA and 400A. Model BH.125, Series400A. Model HS.125, Series 1, 1B, 1B-522,1B/R-522, 1B/S-522, 3B, 3B/RA and 400B.

SB 24-128 Dec 1970 - O 24 Starter/Generator New bearings Ball races Pt.Number N188068 with rubber seals replacesN135904, to obviate bearing failures.

Model DH.125, Series 1A, 1A-522, 1A/S-522, 3A,3A/R, 3A/RA and 400A. Model BH.125, Series400A. Model HS.125, Series 1, 1B, 1B-522,1B/R-522, 1B/S-522, 3B, 3B/RA and 400B.

SB 24-129 Nov 1971 - O 24 Toggle Switches Type LHA1 2 and 3 seriesrevised setting and testing to eliminate possibleopen circuit of switch on applying side G.






SB 24-13 Jun 1965 - R 24 Constant Frequency System. To preventrupture of the Airfuse during inverter start anew 100 Amp airfuse is introduced.

Series 1, 1B and 2

SB 24-130 Aug 1971 - R 24 Protection. To introduce protective covers overvoltage regulators in rear equipment bay.

Model HS.125, Series 1B/S-522, 3B, 3B/RA and400B

SB 24-131 Mar 1972 1 O 24 Voltage Regulators U6112 U6118 U6120.Diodes MR21 23 24 and 25 replaced by newtype.

Model DH.125, Series 1A, 1A-522, 1A/S-522, 3A,3A/R, 3A/RA and 400A. Model BH.125, Series400A. Model HS.125, Series 1-521, 1B, 1B-522,1B/R-522, 1B/S-522, 3B, 3B/RA and 400B

SB 24-132 Apr 1972 - R 24 APU / Fuselage. To introduce covers over DCVoltage Regulator.


SB 24-133 Nov 1971 - O 24 Voltage Regulators U6112 U6118 U6120.Drainage holes added to base of chassisassembly Rotax Mod.4435U SB 24-259.


SB 24-134 Apr 1972 - R 24 DC Distribution. Possible crossed cables atPS1 and PS2 busbars.

Applicable to HS/DH 125 aircraft, Series 1A-522,1A/S-522, 1B/S-522, 3A, 3A/R, 3A/RA, 3B and3B/RA pre mod.25/1721 with mod.25/1335embodied

SB 24-135 Sep 1972 1 R 24 Windscreen Heat Generator N0904/1. Toimprove reliability of the brush gear andprevent burning and pitting of slip rings.


SB 24-14 Jul 1965 - O 24 DC Generation. To introduce internal startswitch SW6100 for Series 1 Aircraft withoutMod.251197 embodied.

Series 1 (without Mod.251197)

SB 24-141 May 1973 1 M 24 Electrical Power - Busbar Protection Unit -Possibility of Some Units Failing to Operate inLow Temperature Conditions (Mod 257479)

Model DH.125, Series 1A-522, 1A/S-522, 3A,3A/R, 3A/RA and 400A. Model BH.125, Series400A and 600A. Model HS.125, Series 1B/S-522,3B, 3B/RA, 400B, 401B, 403B and 600B

SB 24-142 May 1973 - R 24 Over voltage during APU start. Series 3B 3B/RA 400B

SB 24-143 Jul 1973 - R 24 To prevent the possibility of the DC busbarfeeder cables projecting into the turbine debriszone.

Model BH.125, Series 600A. Model HS.125,Series 600B.





SB 24-144 Aug 1973 - R 24 Ground Supply Plug. Possible high resistantearth plug Inspection to check supply plug andearth link are clean of paint.

Applicable to HS/DH 125 aircraft, Series 600Aand 600B

SB 24-147 Apr 1974 1 O 24 To ensure internal start available indicator lightilluminates at all times under fault conditions.

Model DH.125, Series 3A/RA and 400A. ModelBH.125, Series 400A. Model HS.125, Series3B/RA, 400B, 401B and 403B

SB 24-148 May 1978 4 O 24 Introduction of revised APU wiring forMod.252248.

Model HS.125, Series 1A/S-522, 3B, 3B/RA,3B/RC and 400B and 403B.

SB 24-149 Nov 1973 - R 24 Cables in rear equipment bay, possible foul byhot air pipes.

Applicable to HS/BH 125 aircraft Series 600A and600B

SB 24-15 Sep 1965 - O 24 To introduce Fepeil cable at wiring to main andnose leg lock and oleo micro switches in placeof Uninyvin.

Series 1, 1A and 1B

SB 24-150 Feb 1974 - O 24 To introduce improved 115V 400Hz AC systemembodying frequency protection.

Model HS.125, Series 3B/RA.

SB 24-151 Jan 1974 - R 24 Constant frequency system. Possible incorrectpositioning of contactor E on panel ZC.

Applicable to HS/BH 125 aircraft Series 600A,600B and 400B

SB 24-152 Feb 1975 1 R 24 To introduce improvements to Bus tie. Model BH.125, Series 600A. Model HS.125,Series 600B.

SB 24-154 Sep 1974 - R 24 Electrical Power Distribution. Possibility ofincorrect spacers at relay panel mountingcausing fouling and malfunction.

Applicable to HS/BH 125 aircraft series 600A and600B

SB 24-155 Oct 1974 - R 24 Rotax Starter Generator. Improved lubricationof drive shaft splines.

Model DH.125, Series 1A, 1A-522, 1A/S-522, 3A,3A/R, 3A/RA and 400A. Model BH.125, Series400A and 600A. Model HS.125, Series 1, 1-521,1B, 1B-522, 1B/R-522, 1B/S-522, 3B, 3B/RA,400B, 401B, 403B and 600B

SB 24-156 Oct 1974 - R 24 Starter/Generator Air Cooling Duct. Erosion ofinterior.

Applicable to HS/DH/BH 125 aircraft, Series400A, 400B, 600A, 600B and all variants.

SB 24-157 Oct 1974 - O 24 Battery Installation. To introduce additionalsupports for battery vent pipes.

Model DH.125, Series 3A/RA and 400A. ModelBH.125, Series 400A. Model HS.125, Series3B/RA, 400B, 401B and 403B.

SB 24-158 Nov 1974 - O 24 Third battery to improve accessibility theoutboard battery securing bolts are replaced bya lipped mounting plate.

Model DH.125, Series 1A-522, 1A/S-522, 3A,3A/R, 3A/RA and 400A. Model BH.125, Series400A and 600A. Model HS.125, Series 3B,3B/RA, 400B, 401B, 403B and 600B.





SB 24-16 Feb 1966 1 O 24 Starter/Generation Circuit. An airfuse isintroduced in the PE bus bar supply cable toobviate the possibility of losing all electronics.

Series 1, 1A and 1B

SB 24-17 Jul 1965 - O 24 No.3 Battery. To introduce Varley ignitorbattery VPT 24-11-4H in lieu of VPT 24-11-4.New battery has more robust terminal posts.

Series 1, 1A, 1B and 3B

SB 24-170 Jun 1983 3 O 24 Constant Frequency Inverters. To introduceJETS1-2500 25KVA static inverters501-1128-01 in lieu of Leland MCE2341325KVA.

Model DH.125, Series 3A/RA, 400A and 400A(C).Model BH.125, Series 400A and 600A. ModelHS.125, 3B/RA, 3B/RC, 400B, 403B, 600A and600B.

SB 24-171 Feb 1975 - R 24 Distribution. Possible foul between supply fusefor stereo tape system and outlet duct for coldair unit.

Applicable to HS 125 Series 600B aircraft fittedwith stereo tape system.

SB 24-178 Apr 1975 - M 24 Electrical Power - Distribution - Displacementof Hellerman Cabin Pressure Seal Bungs

Applicable to HS/DH/BH 125 aircraft, all series.

SB 24-18 May 1966 1 O 24 Electrical Load Distribution. To modify startercircuit wiring to enable an engine start cycle tobe terminated.

Series 1, 1A and 1B

SB 24-180 Oct 1975 - O 24 Provision for retrospective introduction of nickelcadmium main batteries. Cables required forinstallation of Saft batteries.


SB 24-181 Oct 1975 - O 24 Saft Nickel Cadmium batteries replace theexisting lead acid batteries. Batteries areinterchangeable but the vent pipe is not.


SB 24-182 Sep 1975 - R 24 Maintain integrity of altitude alert system servoaltimeter in the event of PE transducer circuitbreaker being tripped.


SB 24-184 Apr 1978 1 O 24 DC Generation. To improve the accuracy ofammeter readings 95 M/V shunts Pt No 1617Uor 1617S replace 75 M/V shunts Pt NoWOP1607S or U. Main generator shunts.

Model DH/HS.125 Series 1and 3. ModelHS/BH.125 3, 400, 401, 403 and 600.

SB 24-185 Sep 1975 - R 24 No3 Battery Intercell Leakage 3 monthly checkon Varley batteries Pt. Number 24-11/4H withserial Numbers A6945 to A8391 inclusive.

Applicable to HS.125 aircraft, all series withoutmod.251890, but excluding Series 400 and subs.aircraft.





SB 24-186 Jul 1979 1 O 24 Main Batteries. Retrospective introduction ofsaft nickel cadmium batteries in lieu ofDagenite lead acid to meet operatorsrequirements.

Model DH.125, Series 1A, 1A-522, 1A/S-522, 3A,3A/R, 3A/RA, 400A and 400A(C). Model BH.125,Series 400A. Model HS.125, Series 1, 1-521, 1B,1B-522, 3B, 3B/RA, 3B/RC, 400B and 403B.

SB 24-19 Sep 1965 - O 24 To introduce revised fastening of covers forelectrical panels ZL and ZK in rear fuselage.

Series 1, 1A and 1B with Mod.251197incoporated.

SB 24-192 Jul 1976 - I 24 Static inverters.To introduce JET Electronicsstatic inverter 501114801 in lieu of 501112801.

Model DH.125, Series 3A/RA, 400A and 403A(B).Model BH.125, Series 400A and 600A. ModelHS.125, Series 600A, 3B/RA, 3B/RC, 400B, 403Band 600B.

SB 24-194 Jul 1976 - R 24 Overheating of internal connections of PEDQ/FMk. 3 batteries.

Applicable to HS/DH/BH 125 aircraft, all series upto and including Series 600A and 600B.

SB 24-2 Dec 1964 1 M 24 Electrical Power - To introduce battery heatingfor the forward batteries

Series 1 prior to the embodiment of Mod.251197.

SB 24-20 Dec 1965 - O 24 DC Generation. To transfer the fuse supplyingthe start half of the LDK150 Y1 contactor frombattery No.2 to Battery No.3.

Series 1, 1A and 1B with Mod.251197.

SB 24-200 Sep 1977 1 R 24 Chloride main batteries. Unsatisfactory initialcharge of batteries with dry charged cell blocks.

Applicable to HS/DH/BH 125 aircraft, all seriesfitted with Chloride main batteries.

SB 24-201 Jun 1978 2 R 24 APU Generation. To introduce improved APUGenerator over voltage protection.

Model DH.125, Series 1A/S-522 and 600A. ModelHS.125, Series 3B, 3B/RA, 3B/RC, 400B, 403Band 600B.

SB 24-202 Oct 1977 - R 24 Inverter Protection Unit Improved attachment ofcapacitor C3. Inadequate attachment hasresulted in fractures on the connections.

Model BH.125, Series 600A. Model HS.125,Series 600A, 700A, 3B/RC, 403B and 600B.

SB 24-203 Dec 1977 - M 24 Electrical Power - Lights - Beacon - One cable(GG:AD:4R to ZZ:C10:R) Size 16 replaces theexisting standard cable

Series 700A and 700B

SB 24-204 Dec 1977 - R 24 Lucas Contactor LDK150Y1 Lucas Mod.5148Dintroduces changes to auxiliary contact bar.

Model DH/HS.125, Series 1, 3 and all variants(pre mod. N/A post mod.251197. ModelHS/BH.125, Series 400, 401, 403, 600 and allvariants (pre mod. N/A post mod.251197)

SB 24-205 Apr 1978 1 O 24 To permit defuelling operations subsequent toa surge tank overfill condition.

Model HS.125, Series 700 and all variants (PostMod.252545).

SB 24-206 Jan 1978 - R 24 DC Generation. Generator cables chafing onedge of aperture in the fuselage skin.

Applicable to HS 125 Series 700 aircraft.





SB 24-207 Apr 1983 7 R 24 Electrical power - DC ground supply -Overvoltage control introduced for groundpower contactor circuit

Series 1, 3, F3, F1, 400, F400, 600, F600, 700Aand 700B

SB 24-208 Oct 1978 1 R 24 Lear Siegler Starter Generator 23076-005.Introduction of new improved cooling fan.

Model HS.125, Series 700 and all variants.

SB 24-209 Apr 1980 2 I 24 To inhibit main engine start initiation whenstarter/generator is in generate mode as severedamage will result if engine is rotating.

Model DH/HS.125, Series 1, 3 and all variants(Pre Mod.252608 post Mod.251335). ModelHS/BH.125, Series 400, 401, 403 and all variants(Pre Mod.252556 post Mod.251721). Series 600and all variants (Pre Mod.252475 PostMod.252110)

SB 24-21 Apr 1966 - O 24 DC Generation. To introduce Leach relays inlieu of Hendry relays which have provedtroublesome in service.


SB 24-210 Mar 1982 3 R 24 Ignition Deletion of igniter relays and revision ofignition wiring to improve engine starting whenusing GPU.

Model HS.125, Series 700A and 700B.

SB 24-212 Jul 1979 - R 24 Constant Frequency System. To introducehold-on facility for any inverter in use duringengine start cycle.

This bulletin is applicable to HS 125 aircraft ofSeries 1A, F-1B, F-1B/S, 3A, F-3B, 3A/RA,F-3B/R, 400A, F-400B, 600A, F-600B, 700A and700B.

SB 24-213 Jul 1979 - R 24 Electrical Power - To provide a stable voltageat ground power contactor during engine starts

All Series with TFE 731 engines

SB 24-214 Aug 1979 - R 24 DC Generation. Possible generator linecontactor malfunction.


SB 24-215 Sep 1979 - R 24 Power supplies for hydraulic low pressurewarning annunciators transferred from PSI andPS2 to PE busbar.


SB 24-216 Oct 1979 - R 24 Electrical Power - To eliminate a spurious XS1FAIL warning

All Series and all variants thereof up to andincluding Series 700 with TFE engine installation.Series 600A and 600B with Viper Engines. Series400A and 400B and variants Post Mod.252185with Viper Engines.

SB 24-217 Dec 1979 - R 24 Distribution. Possible deterioration of earthstation 26.

Applicable to all HS/BH/DH 125 aircraft with eitherViper or Garrett TFE engines up to and includingSeries 600 except Series 1 aircraft 005 and 008.





SB 24-218 Dec 1979 - R 24 Interference suppression added to engineDe-ice system. Possible nuisance "bright ups"on MWS by voltage spikes.

Series 700A, 700B, 600A and 600B.

SB 24-219 Jan 1980 - R 24 Interference suppression added to enginenacelle intake de-ice system.

Series 600A, F600B, 700A and 700B

SB 24-22 Nov 1970 1 R 24 DC Generation. Voltage regulators U6118. Tointroduce Rotax Mod.4220U (Rotax SB24-127).

Series 1, 1A, 1A-522, 1A/S-522, 1B, 1B-522,1B/R-522, 1B/S-522, 3A, 3B, 3A/R, 3A/RA,3B/RA, 400A and 400B.

SB 24-220 Mar 1983 3 M 24 Electrical Power - Distribution. - Panel 'ZL'addition of protective covers

All Series fitted with Garrett TFE 731 engines upto and including Series 700A and 700B.

SB 24-221 Jun 1980 - R 24 DC Ground Supply. Deletion of redundant earthcable from ground supply power supplyovervoltage sensor.

Applicable to HS 125 aircraft Series 700

SB 24-222 Oct 1980 - R 24 Distribution. Possible damage to cable loomadjacent to weather radar indicator.

Applicable to HS 125 aircraft of Series 700A and700B.

SB 24-223 Jul 1980 - O 24 Electrical Power - APU - To introduce resistoracross each of two current transformers in APUGenerating circuit

All Series with TFE 731 engines installed. Series700 a/c post mod.256818. Series 600 a/c postmod.256856.

SB 24-224 Jul 1980 - R 24 Squat Switch Relay Supply. For relaytransferred from battery No1 to battery No2busbar.

Series 700B

SB 24-225 Oct 1980 - M 24 Electrical Power - Fuel Computers DC powersupply transferred to 'PE' busbar from 'PE2'busbar

Model HS.125, Series 1A, 400A, F400B, 600Aand 700A, 700B.

SB 24-226 Aug 1980 - R 24 Static inverters.To introduce suppressiondiodes in external control circuit to the preventthe inverters tripping out.

All Series with TFE engines installed, Series600A, 600B, 400A, 400B, 3A/RA and 3B/RA withViper engines (Post Mod.256574 Parts A,B,C orD).

SB 24-227 Sep 1980 - R 24 Electrical Power - D.C. voltage regulatorcircuits - To improve the electrical screening ofleads


SB 24-228 Oct 1980 - R 24 Possible incorrect cable termination at inverterprotection unit.

Series F400B, 700A and 700B.

SB 24-229 Jul 1981 1 R 24 Electrical power - A.P.U. start circuit - Toprevent main generators supporting an A.P.U.start

All Series with TFE 731 engines Mod.251605 (upto A/C 257124)





SB 24-23 Mar 1966 - O 24 Load Distribution. To introduce a delay unit inthe oil low pressure system warning.


SB 24-230 Jun 1982 3 M 24 Electrical Power - Electrical Interferencesuppression. Parts A and B - Windscreen heatpower cables. Parts C and D - GeneratorControl Units


SB 24-231 May 1981 - R 24 Electrical power – Radio frequency interferencesuppression – Part A: reduced length earthleads at fuel amplifiers – Part B: addition ofearth posts *12, ‘D’ and ‘E’

Series 600A, F600B, 700A and 700B

SB 24-232 Feb 1982 1 O 24 Wing electrical installation. To introduceterminal block cover and shorter bonding strapsat access panels in forward fairing.

Model HS/BAe.125, Series F-400B, 700A and700B.

SB 24-233 Oct 1981 - R 24 Electrical power - To improve bonding of thegenerator control unit and the unit cable loom

Series 700A, 700B, 600A, F600B, 400A, F400B,3A/RA, 3A/R, 3A, F3B, 1A/S, 1A, F1B/S, F1B/Rand F1B.

SB 24-234 Feb 1985 2 R 24 Electrical power - To revise the operating delayfacility of heavy duty contactors during mainengine and A.P.U. starting

Model DH/HS.125, Series 1A, F-1B, F-1B/S, 3A/Rand F-3B/RA. Model HS/BH.125, Series 400A,F-400B, 600A and F600B. Model HS/BAe.125,Series 700 and all variants.

SB 24-235 Jan 1982 - R 24 Main cable looms. Possible foul on fuselagestructure.

Applicable to HS 125 aircraft Series 700

SB 24-236 Apr 1983 1 R 24 Electrical power - To introduce an improvedemergency contactor (Leach)

Series 700A and 700B to Post Mod 252573- PreMod 256990 and all other Series retro fittedGarrett TFE 731 engines to Pre Mod 256990

SB 24-237 Jan 1983 - R 24 Electrical power - To introduce equipment withbuilt in suppression

Model HS/DH/BH 125 Series Aircraft with GarrettTFE-731 Engines are affected. 1A, 3A, 3A/RA,F-3B, F-3B/RA, 400A, F-400B, 600A, F600B,700A and 700B.

SB 24-238 Feb 1983 - R 24 MWS and ADS80 System. To reduce electricalnoise effects. To prevent spurious MWS brightups. Resistor R14 on MWS board 'H' ischanged in value from 5K6 ohm to 8K2 ohm.

Series 600 (up to A/C 256071) 700 (up to A/CNA0339 and up to A/C 257196)

SB 24-239 Feb 1984 1 M 24 Electrical power - Load distribution - Tointroduce uprated feeder fuses in the PEbusbar circuits on panel ZL

Model DH/HS/BH/BAe.125, Series 1A, 3A, 3B,400A, 400B, 600A, 600B, 700A, 700B and allvariants.





SB 24-24 May 1966 1 O 24 Electrical Load Distribution. To introduce pottedfilter into meterflow fuel flow circuit.

Series 1A and 1B

SB 24-241 Jan 1984 - R 24 Earth cable to flight deck roof panel re-routed. Applicable to HS.125, Series 700 aircraft up toand including 700A and 700B.

SB 24-242 Mar 1984 - M 24 Electrical Power - Navigation - Revised ADS 80power supplies and associated improvedinstrument flag operation

Model HS.125, Series 700B

SB 24-243 Jul 1984 - O 24 Electrical Power - To re-route the cables to No.1 Battery

Model HS.125, Series 700A and 700B

SB 24-244 Feb 1985 - R 24 Electrical Power - Stall warning & Identificationsystem - To revise the annunciator and faultindicator circuits

BAe 125 Series 800A and 800B

SB 24-245 Dec 1985 1 R 24 Electrical Power - Bus-tie contactor LDA 150A8C - Possible failure of main contacts to makedue to insufficient overtravel of contact.

Applicable to DH/BH/HS/BAe.125 aircraft exceptSeries 1A and 1B pre mod.251335.

SB 24-247 Feb 1985 - R 24 Electrical Power - To introduce additionalrelays in the windscreen Panel 'A' temp controlcircuits

Series 800 (up to A/C 258030)

SB 24-248 Mar 1985 - M 24 Electrical Power - EFIS power supply - Revisedheat sink sub-Assembly

Series 700B, 800A and 800B

SB 24-249 Apr 1985 - M 24 Electrical Power - Windscreen heat controllers -Revised overheat monitoring control

Model BAe.125, Series 800A and 800B.

SB 24-25 Nov 1970 1 O 24 DC Generation. Starter Generators. Improvedstarter generators are fitted with a greaseretaining housing.

Series 1, 1A, 1A-522, 1A/S-522, 1B, 1B-522,1B/S-522, 1B/S-522, 1B/R-522 and 3B (25/015,062 and 069).

SB 24-250 Apr 1985 - M 24 Electrical Power - Panel 'DA' - Improvedprotection for electrical cables

Model BAe.125, Series 800A and 800B.

SB 24-251 Apr 1985 - M 24 Electrical Power - Revised Signal SummingUnit Earth Connections

Model BAe.125 Series 800A and 800B.

SB 24-252 Jun 1985 - R 24 Electrical Power - To introduce revised earthcircuit arrangements

Model BAe 125 Series 800A and 800B.

SB 24-254 Sep 1986 - O 24 Electrical Power - Additional electrical interlockbetween battery contactors and engine startcontactors

Model BAe.125 Series 700A, 700B, 800A and800B.





SB 24-255 Oct 1985 - M 24 To check for a possible foul between the TKSdeicing pump and an adjacent electrical loom.

Applicable to all HS.125 aircraft, Series 400B to700B inclusive, post mod.252049.

SB 24-256 Jun 1986 - O 24 Electrical power – Replacement relays – PartA: central attention unit – Part B: panel DA-Sammeter relay

All Series up to and including 403B (A/C 25249)

SB 24-257 Jul 1986 - R 24 Standby Power - To inhibit No.2 jet batterypack charging during test operation

Model BAe.125 SEries 800A and 800B

SB 24-259 Nov 1986 - M 24 Electrical Power - Panel ZK - Panel extensionrevised. To provide improved segregation

Model BAe.125 Series 800A and 800B

SB 24-26 Apr 1966 - O 24 DC Generation. To improve the attachment ofammeter shunt fuse assembly the existingscrews are replaced by hexagon headed bolts.


SB 24-260 Mar 1987 - M 24 Electrical Power - Component installation -Possible foul between pillar stud and electricalloom

Applicable to BAe 125 aircraft Series 800.

SB 24-261 Mar 1988 1 R 24 Electrical power – Wiring installation –Rerouting of wiring installation at panel ZL

Series 800

SB 24-262 Jun 1987 - M 24 Electrical power - Distribution - To improve theintegrity of the power supply to the laserefinertial reference system (YE1779A)

Series 800B

SB 24-263 Jan 1988 1 M 24 Electrical Power - Smoke Drill - Additionalcircuit breaker identification labels

Series 700B, 800A and 800B.

SB 24-264 Jun 1988 1 M 24 Electrical Power - DC bus-tie system - Inspectfor correct operation

Applicable to all DH/HS/BAe 125 aircraft whcihhave a split D.C. busbar system.

SB 24-265 May 1988 - R 24 Electrical Power - APU Generation - APUGenerator control unit circuit revised

Series 800B (A/C 258091 094 097)

SB 24-266 Apr 1994 2 I 24 Electrical Power - Battery - Introduction ofSAFT (NI-CAD) Batteries in place of GATES(Lead Acid)

Model BAe 125 Series 800.

SB 24-267 Aug 1988 1 M 24 Electrical Power - AC Generation - Revisedcable termination at both AC Generator controlunits

All Series 800A and 800B aircraft with theexceptionof258088, 258106, 258115, 258116,258118, 258120, 258122 and subs. which havethe mod. emobodied during manufacture beforedelivery.





SB 24-268 Apr 1989 3 M 24 Electrical Power - Starting - Hartman ContactorA848MAS, A848KHS, A848KSS mountingarrangement revised

Series 600 and 700

SB 24-269 Jun 1989 - R 24 Electrical power - Elcon battery disconnects -Inspect for satisfactory condition

All Series with Elcon Battery Disconnect Pt.No.BD6-3

SB 24-27 Dec 1970 1 I 24 DC Generation Starter. New brush coverassembly added increased in width and withcutaway to clear terminal block.

Series 1 and 1A

SB 24-270 Mar 1989 - M 24 Electrical Power - Cable installation - Chafingof electrical cable looms above panel DA-E

Applicable to BAe.125 aircraft Series 800.

SB 24-271 Oct 1989 1 R 24 Restricted - See Remarks Series 800A (A/C 258129)

SB 24-272 Dec 1989 - R 24 Restricted - See Remarks Series 800A (A/C 258129 131 134)


SB 24-274 Mar 1990 1 R 24 Electrical Power - Introduction of Leland staticinverters Part No. ASH 664-1PF

Series 800A Post Mod.253135A

SB 24-275 Sep 1990 - O 24 Panel 'DA'. Introduction of replacementammeter for LH pitot heater circuit.

Series 1 3 and 400

SB 24-276 Mar 1990 - R 24 Restricted - See Remarks Series 800A (A/C 258129 131 134)

SB 24-277 Mar 1990 - O 24 To Introduce Jet 1250VA static inverters in lieuof Leland 1500VA static inverters.

Series 800A (258166)

SB 24-279 Nov 1990 - M 24 Rear fuselage. Introduction of a cover for thestandby inverter. To reduce the possibility ofthe inverter being contaminated bycondensation.

Series F600A and F600B aircraft PostMod.252475. Series 700A and 700B aircraft PostMod.252509.

SB 24-28 Dec 1970 1 I 24 DC Generation Starter. Introduction of RotaxMod.4104B (SB 24-75). To ensure satisfactorylocking of brush and cover assembly.

Series 1, 1A and 3B (25/015)

SB 24-280 Feb 1992 1 O 24 Electrical Power - Landing Lamp Control Circuit- Introduction of replacement relays Leach PartNo. M520-U5N

Series 600 700 800

SB 24-281 Jun 1991 - I 24 Electrical power - Inspection of SAFTnickel-cadmium battery terminal block forinsulation breakdown

Applicable to all BAe 125 aircraft which areequiped with SAFT Nickel-cadium batteries asidentified by Serial Numbers listed in SAFTBulletin.





SB 24-282 Jun 1993 1 R 24 Power plant - Power plant accessories -Introduction of engine and APUstarter/generator models 23076 and 23080 withnew bearings

All Series with Lear Siegler Starter/Generatorsfitted

SB 24-284 Dec 1991 - R 24 Electrical Power - Auxiliary Power Unit - Torelocate the generator control unit earth wire

All Series F3B Post Mod.251601/256859, AllSeries F400B Post Mod.256859, All Series F600BPost Mod.256856, All Series 700B PostMod.256818 - all with Garrett Auxiliary Power Unitinstallation. All Series 800B PostMod.258706/259404B ewith Garrett orTurbomach Auxiliary Power Installations.

SB 24-285 Jan 1992 - O 24 Electrical Power - Main Batteries - To introducebattery heater muffs for NiCad batteries

All Series 800 aircraft Pre and Post Mod.253149fitted with Ni-Cad Batteries.

SB 24-286 Nov 1992 - O 24 Electrical Power - Main Batteries - Introductionof Hawker sealed lead acid battery with integralheater

Series 800 aircraft Post Mod.253187A.

SB 24-287 Feb 1992 - O 24 Electrical Power - Landing Lamp Control Circuit- Introduction of replacement relays PartNumber M520-U5N-L

Series 600, 700 and 800 Post Mod.253258A, BorC.

SB 24-288 Feb 1992 - M 24 Electrical Power - Smoke Drill - Introduction ofwhite indicator labels to windscreen heat powersupply circuit breakers

Series 800

SB 24-289 Apr 1992 1 M 24 Generator control. To introduce additionalgenerator control arrangements and relocateG.C.U. earth wires.

Series F1, F3, F400, F600, 700 and 800

SB 24-29 Dec 1970 1 O 24 DC Generation Starter. Introduction of RotaxMod.4096B (SB 24-78). New suppressor trayassembly bolted instead of welded.

Series 1, 1A and 3B (25/015)

SB 24-290 Jul 1992 - O 24 Electrical power - Main batteries - Introductionof Hawker type 25AH capacity sealed lead acidbatteries

All Series aircraft up to and including Series 600equiped with Chloride, Dagenite or similar LeedAcid type batteries.

SB 24-292 Jun 1992 - R 24 Electrical power - Inspection of batteryconnectors (Elcon) for presence of shippingplugs

All Series up to and including 1000

SB 24-293 Feb 1993 2 M 24 Introduction of revised mounting arrangementsfor the Battery and Emergency Contactors.

Series 700 and 800





SB 24-294 Apr 1994 - R 24 Electrical Power - Panel ZZ - To relocateAuxiliary Power Unit control power supply tothe PE2 busbar

BAe 125 Series 1000A, 1000B and Hawker 1000.

SB 24-295 Aug 1992 - R 24 Electrical Power - Inspection of DC powerdistribution panel ZK-A to ensure that correctlyrated fuse and label are fitted

Applicable to 1000A and 1000B.

SB 24-296 Feb 1993 - O 24 Electrical Power - Main Batteries - Introductionof modified cable clipping to improve clearanceof RH Battery Vent Pipe

Series 1000A and 1000B.

SB 24-297 Aug 1992 - R 24 Electrical Power - Inspection of cable loom(s)for possible damage caused by main entry doormechanism

Applicable to BAe 125 Series 1000.

SB 24-298 Apr 1993 - O 24 Electrical Power - Introduction of an additionalheated portion of galley drain

Series 1000A and 1000B Post Mod.253373A and253373C.

SB 24-3 Nov 1964 - O 24 Improved earth station for fuel pumps to reducethe possibility of corrosion.

Series 1, 1A and 1B

SB 24-30 Dec 1970 1 O 24 DC Generation Starter . Introduction of RotaxMod.4062B (SB 24-30). Capacitor assemblyhave welded clamps to prevent movement.

Series 1, 1A and 3B (25/015)

SB 24-301 Mar 1995 - R 24 Batteries. To introduce a revised batteryvoltage measurement circuit.

BAe 125 Series 1000A, 1000B and Hawker 1000

SB 24-302 Jun 1993 - O 24 Electrical Power - DC Generation - Introductionof Lucas starter generator part No. 23091-002

Series 1000 (259036)

SB 24-303 Apr 1994 - O 24 Introduction of wiring provision for an additionalPS1 feeder cable between Panels GC andDA-K and an additional power link betweenbusbars PS1 and PE(a)

BAe 125 Series 1000 aircraft 259003 to 259036inclusive.

SB 24-304 Mar 1993 - O 24 Electrical Power - Battery venting - Tointroduce an elbow at the right main batteryvent


SB 24-305 Nov 1994 - R 24 Introduction of revised power supplies for theFADEC Engine 1 and Engine 2 overspeedcircuits.

BAe 125 Series 1000A, 1000B and Hawker.

SB 24-306 Oct 1993 - R 24 Electrical Power - Inspection of AC generatorand starter/generator for presence of improvedattachment bolts

Applicable to BAe 125 Series 1000





SB 24-3068 Feb 1999 1 R 24 Replacement of APU Diodes on panel ZK-Aand installation of heat sinks

BAe 125 Series 1000A/B and Hawker 1000

SB 24-307 Jun 1993 - R 24 Superseded by SB 24-317 Applicable to HS/BAe 125 series 700 and 800

SB 24-308 Jul 1994 1 M 24 Electrical Power - Standby Inverter - Tointroduce improved sealing of the printed circuitboard assembly in the static inverter (TypePC250)

Hawker 800, BAe 125 Series 800A and Series800B and all DH/BH/HS/BAe 125 Series 700aircraft which are Post Mod.252740.

SB 24-309 Dec 1993 - R 24 Electrical Power - Revision to the quickattach/detach kit for starter/generator23091-002

Series 1000 Post Mod.253416A

SB 24-31 Dec 1970 1 O 24 Introduction of Rotax alternator Mod.R6611(SB 24-123).

Series 1, 1A, 1A-522 and 1B

SB 24-310 Feb 1994 - M 24 Electrical Power - Lighting - To introduce acircuit breaker at the transformer output for the6V lighting circuits

Series 600A, 600B, 700A and 700B

SB 24-310 - INSP Aug 1993 - R 24 Inspection of panel RY for signs of overheatingof cable looms and connectors.


SB 24-312 Sep 1996 1 O 24 Electrical power - Main batteries - To introduceHawker type 25 AH capacity sealed lead acidbatteries

Model DH/HS 125 Series 1, 3 and 400 aircraftwhich are post mod256734A, 256734B, 256734C,256734D or 256734E.800XP which are PostMod.253563C.

SB 24-3122 Jul 1999 - O 24 ELECTRICAL POWER - MAIN BATTERIES -To Improve Access to Batteries

BAe 125 Series 1000A and 1000B airplanesequipped with Saft Batteries.Hawker 1000airplanes equipped with Saft Batteries

SB 24-313 Dec 1994 - M 24 Inspection of cable loom for possible damagecaused by flap selector spring strut.

applicable to BAe Series 1000A, 1000B andHawker 1000.

SB 24-314 Oct 1994 - O 24 To Introduce circuit breakers on panel GN andPanel GU in place of fuses.


SB 24-315 May 1995 - R 24 DC Electrical load distribution. To transfer thepower supply for GPS from PS2 Busbar to PEBusbar.

BAe 125 Series 1000

SB 24-316 Feb 1995 - R 24 Electrical Power - Power Plant Accessories -Introduction of Engine and APUStarter/Generator models 23076 and 23080with new bearings

All Series 800 and 1000 (With Starter/Generatorunit)





SB 24-317 Dec 1994 - M 24 Electrical Power - Inspection for integrity ofsoldered diode connections on panels ZL(Series 800) or ZK (Series 1000)

Applicable to BAe 125 Series 800A, 800B, 1000A,1000B, Hawker 800 and 1000

SB 24-319 Feb 1995 - M 24 Electrical Power - Emergency power supplyunit - To revise 'Jet Pack' battery output voltagemonitoring

BAe 125 Series 800B (258211)

SB 24-32 May 1966 - I 24 Inverter Cooling. Change-over valve, new valvebody/assy.

Series 1A

SB 24-320 Jun 1997 - M 24 Restricted - See Remarks BAe 125 Series 800A (U-125 only) 258215 and58227 (JASDF)

SB 24-3201 Oct 1998 - M 24 Inspection/Replacement of chafed wire bundleson the front ventral tank transfer/crossfeedvalve and transfer valve

Models 1000

SB 24-3202 Oct 1999 - O 24 Electrical power - Replacement of powerdiodes on panel 'ZL'

HS 125 Series F3B, F3B/RA, F400B, F403B,600A, F600B, 700A and 700B. DH 125 Series 1A,3A, 3A/RA and 400A. BH 125 Series 400A and600A. BAe 125 Series 800A and 800B. Hawker800.

SB 24-3212 Aug 1999 - M 24 Electrical Power - Inspection/Repair of wirebundle from panel 'JA'

Hawker 800XP, Serials 258266, 258277 through258287, 258289 through 258304, 258307 through258324, 258326 through 258332, 258334 through258340, 258342 through 258347, 258349 through258359, 258361 through 258369, 258371 through258380, 258382 through 258406 and 258408through 258424.

SB 24-3213 Feb 2000 1 M 24 Restricted - See Remarks Hawker 800 (U-125A) JASDF airplanes

SB 24-322 Jul 1996 - M 24 Electrical Power - To introduce covers to theflight deck terminal blocks 'CQ' and 'CR'

BAe 125 Series 800A, 800B, Hawker 800, SpecialVariants (C29A,U-125A) and Hawker 800XP.

SB 24-3224 Mar 2000 1 M 24 Electrical Power - Inspection of wiring harnessfor chafing and modification if required

Hawker 800XP

SB 24-324 Oct 1996 - R 24 Restricted - See Remarks Hawker 800 U125A (JASDF) (258245, 258247,258268, 258250)

SB 24-3272 Oct 2000 1 M 24 Electrical Power - Inspection / Relocation ofPower Source for Instrument Panel and LH andRH Cockpit Blowers

HS 125 Series 700A. BAe 125 Series 800A andHawker 800 which utilize a Brailsford modelTBL-2.5 blower installed in accordance with thedrawings listed in Table X and/or Table Y of thisbulletin. Hawker 800XP





SB 24-3278 Aug 2000 - M 24 Electrical Power - Introduction of Leland StaticInverters P/N ASH664-5 and Modifications toBus Links XS1 and XS2

BAe.125 Series 800A/800B, Hawker 800, andHawker 800XP. BAe.125 Series 800A MajorVariant U-125. Hawker 800 Major VariantU-125A.

SB 24-33 Dec 1970 1 O 24 Introduction of Rotax alternator Mod.3993B (SB24-45).


SB 24-3321 May 1999 - O 24-00 Electrical Power - Lead Acid Main BatterySpares Replacement

Beechjet Model 400A, Serials RK-98 and after.

SB 24-3330 Aug 2006 1 O 24 Electrical Power - Introduction of ReplacementCircuit Breakers

BAe125 Series 1000 and Hawker 1000 Pre Mod.25F606B

SB 24-3338 Aug 2001 - O 24 Introduction of Replacement Circuit Breakers BAe 125 Series 800A/800B (including MajorVariants C-29A and U-125); Hawker 800 andHawker 800XP which are Pre Mod. 25F606A;Hawker 800 (U-125A) (JASDF) which are PreMod. 25E134A.

SB 24-3389 Mar 2000 - M 24 Restricted - See Remarks BAe 125 Series 800 (U-125) JASDF, Serials258215, 258227 and 258242;Hawker 800(U-125A) JASDF, Serials 258245, 258247,258250, 258268, 258288, 258305, 258306,258325, 258333, 258341, 258348, 258360,258370 and 258381.

SB 24-34 Jun 1966 - O 24 DC Generation Starter. Introduction of RotaxMod.4016B. Cored brushes in grade PDM4A toreplace grade 555 brushes.

Series 1, 1A and 1B

SB 24-3436 Feb 2001 - O 24 Restricted - See Remarks Hawker 800 (U-125A)

SB 24-3453 Jan 2001 - M 24 Electrical Power/Inspection of ElectricalConnections on Panels GG, CG and DA.

Hawker 800XP

SB 24-35 Jun 1966 - O 24 DC Generation. Voltage Regulator U6112Introduction of Rotax Mod.39944 to enableregulator to operate at higher temperature.

Series 1, 1A and 1B Pre Mod.251323

SB 24-3555 Jun 2004 1 M 24 Electrical Power - 'DA-A' Panel WiringModification for Emergency Radio

Hawker 800XP, Serial Numbers 258541, 268556and 258567 through 258608.





SB 24-3588 Sep 2003 1 M 24 ELECTRICAL POWER - Inspection/Repair ofWire Bundles from Panel ’JA’ and PressureBung 'DD'

BAe.125 Series 800A and Series 800B, Serials258091 through 258128, 258130, 258132,258133, 258135 through 258150, 258152,258153, 258155, 258157, 258160 through258214, 258216 through 258226, 258228 through258241, 258243, 258244, 258246, 258248,258249

SB 24-3641 Feb 2004 - O 24 FUEL - REFUEL PANEL UPGRADE WITHLOWER BATTERY CONSUMPTION


SB 24-3664 Jun 2004 - M 24 Electrical Power - Wiring Modification forAirshow® Cabin Display

Hawker 800XP, Serial Numbers 258541, 258556and 258567 through 258598, if equipped withAirshow® Cabin Display.

SB 24-3693 Feb 2005 - R 24 Electrical Power - Starter-Generator ShieldGround Relocation

MU-300, Serials A003SA through A091SA; 400,Serials RJ-1 through RJ-65; 400A, Serials RK-1through RK-422 400T(TX), Serials TX-1 throughTX-13.

SB 24-37 Jun 1966 - O 24 Constant Frequency System EKCO Inverter150VA/182. Change of capacitor valve toensure reasonably volts across transistor.

Series 1 Pre Mod.251174. 1A Post Mod.251067(25062 and 25069).

SB 24-3724 May 2005 - M 24 Electrical Power - Inspection/Replacement ofHydraulic Overtemperature Switch Fuse


SB 24-3745 Sep 2005 1 M 24 Electrical Power - Inspection of DA-A PanelBussing

Hawker 800XP, Serial Numbers 258541, 258556,258567 through 258609, 258611 through 258628,258630 through 258684 and 258686 through258728.

SB 24-3751 Mar 2006 - O 24 Fuel - Refuel panel upgrade with lower batteryconsumption for Aircraft equipped with weathergraphic CDU (S)

Hawker 800XP, Serial Numbers 258541, 258556and 258567 through 258669 (if ServiceBulletinNo. 34-3750 is accomplished prior to orconcurrent with accomplishment of this ServiceBulletin).

SB 24-3772 Feb 2006 - M 24 Electrical Power - Inspection of Panel DAWiring

Hawker 800XP, Serial Numbers 258297, 258301,258304 through 258306, 258309, 258311,258313, 258315, 258317, 258319, 258320,258322, 258325, 258326, 258331, 258333,258334, 258336, and 258338 through 258755.





SB 24-3793 May 2006 - M 24 Electrical Power - Inspection and Replacementof UAM100 Limiters

DH.125 Series 1A; HS.125 Series 1B; DH.125Series 1A-522; HS.125 Series 1B-522;DH.125Series 1A/R-522; HS.125 Series 1B/R-522;DH.125 Series 1A/S-522;HS.125 Series1B/S-522; DH.125 Series 3A; HS.125 Series 3B;DH.125 Series 3A/R;HS.125 Series 3B/R; DH.125Series 3A/RA; HS.125 Series 3B/RA; HS.125Series 3B/RB;HS.125 Series 3B/RC; HS.125Series F3B; HS.125 Series F3B/RA;BH.125-400A;DH.125-400A; HS.125-400B;HS.125-400B/1; HS.125-401B;HS.125-403A(C);HS.125-403B; HS.125 Series F400B; HS.125Series F403B;BH.125 Series 600A; HS.125Series 600A; HS.125 Series 600B; HS.125 Series600B/1;HS.125 Series 600B/2; HS.125 Series600B/3; HS.125 Series F600B; HS.125 Series700A;HS.125 Series 700B; which are Post Mod.252885 (see SB 24-239-2885).BAe.125 Series800A; BAe.125 Series 800A(C-29A); BAe.125Series 800A(U-125);BAe.125 Series 800B;Hawker 800(U-125A); BAe.125 Series 1000A;BAe.125 Series 1000B;Hawker 1000. Hawker800XP and Hawker 850XP thru 258768

SB 24-38 Jun 1966 - O 24 Constant Frequency System EKCO Inverter150VA/182. Addition of hole in cover to enableoutput voltage to be adjusted.

Series 1 Pre Mod. 251174. 1A Post Mod. 251067(25062 and 25069)

SB 24-3850 Nov 2008 1 M 24 Electrical Power - Circuit Protection for CockpitFan Blowers

BH.125 Series 600A, Serial Numbers 256025,256026, 256040, 256046, 256047, 256055,256066, 256067, 256068 and 256069. HS.125Series 700A, Serial Numbers 257006, 257019,257024, 257029, 257033, 257036, 257038,257039, 257042, 257044, 257048, 257049,257052, 257057, 257059, 257060, 257065,257068, 257069, 257071, 257074, 257075,257077, 257078, 257081, 257083, 257086,257090, 257095, 257098, 257101, 257104,257106, 257111, 257113, 257114, 257116,257117, 257119, 257120, 257122, 257123,257125, 257128, 257129, 257131, 257134,257135, 257137, 257140, 257141, 257144,257147 and 257148.

SB 24-39 Dec 1970 1 O 24 DC Generation. Battery blocking rectifierAE7011. Modified terminal block and newterminal block cover.

Series 1, 1A, 1B, 1B/S-522 and 1B/R-522





SB 24-3914 Dec 2008 - O 24 Electrical Power - Removal of Engine ChipDetector Indicators

Hawker 900XP Serials HA-0001 through HA-0073

SB 24-3923 Dec 2008 - M 24 Electrical Power - Inspection / Replacement ofIncorrect Fuse and Labeling

Hawker 900XP Serials HA-0001 throughHA-0060.

SB 24-4 Jan 1965 1 O 24 Hot Rod Ice Detector. To introduce Plesseycircuit breaker 516/80000/025 in lieu of7CZ/106664/25 at panel DA and516/1/80000/020 in lieu of 7CZ/10664/20.

Series 1, 1A and 1B except A/C with Mod.255396embodied

SB 24-40 Jun 1966 - O 24 Battery. To introduce shouldered spigots onbattery tray in lieu of existing straight spigotsensuring stronger welded joints.

Series 1, 1A, 1B, 3, 3A and 3B

SB 24-41 Dec 1970 1 I 24 DC Generation. To introduce AEI toggleswitches 200 series which have improvementsin sealing (AEI SB24-33).

Series 1, 1A, 1A-522, 1A/S-522, 1B, 1B-522,1B/S-522, 1B/R-522, 3A, 3B, 3A/R, 3A/RA and3B/RA

SB 24-42 Jun 1966 - I 24 Constant Frequency System Static InverterEKCOE182. Introduction of EKCO Mod.16 toimprove high temperature performance.


SB 24-43 Nov 1970 1 I 24 Introduction of Rotax alternator Mod.3976B. Series 1, 1A, 1A-522, 1A/S-522, 1B, 1B-522,1B/S-522, 1B/R-522, 3A, 3B, 3A/R, 3A/RA,3B/RA, 400A and 400B

SB 24-44 Nov 1970 1 O 24 DC Generation Starter Generator. Introductionof Bendix grade 166 brushes in lieu of gradePDM4A to give increased brush life.

Series 1, 1A, 1A-522, 1A/S-522, 1B, 1B-522,1B/S-522, 1B/R-522 and 3B (25/015, 062, 069).

SB 24-45 Nov 1970 1 O 24 DC Generation. Voltage Regulators.Introduction of Rotax Mod.4221U Replacementof capacitor C25 to eliminate possibility offailure.

Series 1, 1A, 1A-522, 1B, 1B-522 and 3B (25/015,062, 069)

SB 24-46 Nov 1970 1 O 24 Constant Frequency System Hendrey Relays.Introduction of Hendrey Mod.2 Addition ofarmature stops to avoid possibility of failure.

Series 1, 1A, 1A-522, 1A/S-522, 1B, 1B-522,1B/S-522 and 1B/R-522

SB 24-47 Nov 1970 1 O 24 Random Frequency Rotax Mod.SP6708 SB24-175 to voltage control unit U8601. Theovervoltage level is reset from 128 to 138 volts.

Series 1, 1A, 1A-522, 1A/S-522, 1B, 1B-522,1B/S-522 and 1B/R-522

SB 24-48 Aug 1966 - O 24 DC Generation No.3 ignitor battery restrainingstrap changed to silicone coated asbestos tomake them fully acid resistant.






SB 24-49 Oct 1966 - I 24 Constant Frequency System. Improved methodof mounting 2500VA Leyland inverter on topshelf.

Series 1A

SB 24-5 Dec 1970 1 O 24 Static Inverter. Ekco Type E182 (EkcoSB24-3). To increase the effective range ofover voltage setting.

Series 1, 1A, 1A-522, 1B and 3B (25/015) PostMod.251067C Part C.

SB 24-50 Sep 1966 - O 24 DC Generation. To reposition ground supplycontactor fuse BY on Pre Mod.251335 A/C andfuse BY and CH on Mod.251335 A/C.

Series 1, 1A, 1B and 3B.

SB 24-51 Oct 1966 - O 24 Distribution Panel DA Fuse Panel AD.Introduction of labels for fuses to clarifyidentification.

Series 1, 1A and 1B Pre Mod.251335

SB 24-52 Oct 1966 - R 24 DC Generation. To avoid inadvertent operationgated bus tie switch type LHA2/BG219/D2 isintroduced.

Series 1A and 1B Post Mod.251335. Series 3, 3Aand 3B

SB 24-53 Oct 1967 1 R 24 DC Generation Internal start/normal/emergencyswitch improved guard to prevent rapidselection from start to emergency.

Series 1, 1A less aircraft 25096 and subs. 1A,and 1B less aircraft 25097, with mod.251197.

SB 24-54 Dec 1966 - O 24 DC Generation. To downrate the value of fusein charge circuit to 3.rd battery to 3 amps.


SB 24-55 Jan 1967 - R 24 Distribution. Re-arrangement of electricaldistribution on A/C with split busbar system.

Series 3B

SB 24-57 Sep 1970 2 I 24 Electrical Power Diodes BYZ12 are to bereplaced in all cases where rating is suitable byCV7313 diodes.

Series 1, 1A, 1A-522, 1A/S-522, 1B, 1B-522,1B/R-522, 1B/S-522, 3A, 3A/RA, 3A/R, 3B,3B/RA, 400A and 400B

SB 24-58 Jan 1967 - R 24 Distribution U/C green light. The RH green lightcircuit cables to the relay have been re-routedto by pass the relay.

Series 1A a/c Post Mod.251265 and PreMod.251601A part A.

SB 24-59 Jun 1967 - R 24 Introduction of second 26 volt AC 400c/s powersource with failure indication.

Series 1, 1B and 3

SB 24-6 Dec 1970 1 O 24 To introduce Mod No1 to Hendrey relays toimprove the insulation between the energisingcoil leads and earth.


SB 24-60 Nov 1970 1 R 24 DC Generation. To introduce RotaxMod.4400D to starter generator contractorD16401.

Series 1A-522, 1A/S-522, 1B-522, 1B/S-522,1B/R-522, 3A, 3B, 3A/R, 3A/RA, 3B/RA, 400Aand 400B. Post Mod.251335.





SB 24-61 Nov 1970 1 O 24 DC Generation. Starter/Generators. Armatureshaft strengthened at fan drive end and fanengaged on splines instead of slots.

Series 1A, 1A-522, 1A/S-522, 1B, 1B-522,1B/S-522, 1B/R-522, 3A, 3B, 3A/R, 3A/RA,3B/RA, 400A and 400B

SB 24-62 Nov 1970 1 O 24 DC Generation. To introduce RotaxMod.4382U to voltage regulators to preventslight over-voltage conditions on someregulators.

Series 1, 1A, 1A-522, 1A/S-522, 1B, 1B-522,1B/R-522, 1B/S-522, 3A, 3A/R, 3A/RA, 3B,3B/RA, 400A and 400B

SB 24-63 Oct 1967 1 R 24 Negative Bus-bar at earth station 2 possibilityof insufficient clearance and short circuit.

Applicable to HS.125 aircraft, Series 1, 1A and1B, post Mod.251197, pre. Mod.251492, pre.Mod.251335.

SB 24-64 Mar 1972 3 I 24 DC Generation. To replace Varley lead acidbattery with Sonotone nickel-cadmium batteryto provide a longer service life battery.

Series 1, 1A, 1B, 3, 3A, 3AR, 3ARA, 3B, 3BR and3BRA.

SB 24-65 Oct 1969 2 O 24 Constant Frequency System. Re-routing No 2inverter positive power supply cable assembly.

Series 1A, 1A-522, 1A/S-522, 1A/R-522, 3A, 3A/Rand 3A/RA (Pre Mod.251804)

SB 24-66 Aug 1969 - I 24 Constant Frequency System. To introduceLeland Mod.LEL 6430 to inverter.

Series 1, 1A, 1A-522, 1A/S-522, 1B, 1B-522,1B/S-522, 3A 3A/R 3A/RA, 3B, 3B/RA, 400A and400B

SB 24-67 Feb 1968 - O 24 Constant Frequency. To introduce LelandMod.LEL64-36 to Leland inverter MGH182-100 Introduction of DC brushes withimproved life.

Series 1 and 1B with 251174, 1B with 255396, 1Band 3B with 251405, 3B/R.

SB 24-68 Oct 1970 1 I 24 Generator Switching Unit. Introduction of RotaxMod.4341D Range of resistors added to groupboard.

Series 1, 1A, 1A-522, 1A/S-522, 1B, 1B-522,1B/R-522, 1B/S-522, 3A, 3A/R, 3A/RA, 3B,3B/RA, 400A and 400B (A/C post mod.257151).

SB 24-69 Jul 1968 - I 24 To introduce Rotax Mod.4356A to invertercooling change-over valve C5068.

Series 1A (Post Mod 251201)

SB 24-7 Apr 1965 - O 24 Voltage Regulators. To introduce Rotax voltageregulators Type U6118 and U6119 in lieu ofU6120 and U6112 respectively.

Series 1, 1A and 1B

SB 24-70 Nov 1970 1 R 24 Alternator N0904/1. To introduce RotaxMod.R6772.


SB 24-71 Mar 1971 - O 24 Introduction of new battery hold-down bolts. Model DH.125, Series 1A, 1A-522, 1A/S-522, 3A,3A/R and 3A/RA. Model HS.125, Series 1, 1-522,1B, 1B-522, 1B/R-522, 1B/S-522 and 3B.





SB 24-71 - INSP Mar 1968 - R 24 Battery Installation Surplus weld on theunderside of battery holding down wing boltsand possible omission of washer SP125G.

Model DH.125, Series 1A, 1A-522, 1A/S-522, 3A,3A/R and 3A/RA. Model HS.125, Series 1, 1-522,1B, 1B-522, 1B/R-522, 1B/S-522 and 3B.

SB 24-72 Apr 1968 - O 24 Generator Overheat Switch. An improvedswitch is introduced in which the cable enter atright angles to the switch body.

Series 1, 1A, 1A-522, 1A/R-522, 1A/S-522, 1B,1B-522, 1B/R-522, 1B/S-522, 3, 3A, 3B, 3A/R,3B/R, 3A/RA and 3B/RA

SB 24-73 Apr 1968 - I 24 Introduction of uprated main supply fuses inBendix inverter 1518-7-J circuits.

Series 1, 1B, 1B-522, 1B/R-522 (PreMod.251335), 1B/S-522 (Pre Mod.251335) and3B (Qantas 062.069) (DCA 015) only.

SB 24-74 Jun 1972 1 O 24 DC Generation. Elimination of automaticselection of generator on line by operation ofthe relight switch.

Series 1, 1A, 1A-522, 1A/R-522, 1A/S-522, 1B,1B-522, 1B/R-522, 1B/S-522, 3A, 3A/R, 3A/RA,3B, 3B/R and 3B/RA

SB 24-74 - INSP Jun 1968 2 R 24 DC Generation. Elimination of automaticselection of generator òn line' by operation ofthe relight switch.


SB 24-75 May 1968 1 R 24 DC Generation. Excessive wear atStarter/Generation Fan Drive. Inspection of thecondition of the drive is required.

Applicable to HS.125 aircraft, all Series, fitted withstarter/generators type BC.0107 or BC.0107/1.

SB 24-76 Sep 1968 - R 24 Rotax Mod.4474U. To introduce over voltageprotection unit U3627/1 in lieu of U3627.

Series 1A-522, 1A/S-522, 1B/S-522, 3A, 3B,3A/RA and 3B/RA Post Mod.251335

SB 24-77 Dec 1981 4 O 24 Electrical power – To introduce voltageregulators U6120 in place of U6118 – Part A:aircraft post mod. 251335 – Part B: aircraft premod. 251335

Series 1, 1A, 1A-522, 1A/S-522, 1A/R-522, 1B,1B-522, 1B/S-522, 1B/R-522, 3A, 3A/R, 3B/R,3A/RA and 3B/RA

SB 24-78 Dec 1968 - O 24 To introduce overvoltage protection into ACcircuit which will automatically isolate aninverter if the output increases.

Series 1, 1A, 1A-522, 1A/S-522, 1A/R-522, 1B,1B-522, 1B/S-522, 1B/R-522, 3A, 3B, 3A/R, 3B/R,3A/RA and 3B/RA

SB 24-79 Oct 1968 - R 24 To introduce diode into the output circuit fromthe overvoltage protection unit to trip coil offield contactor.

Series 1A-522, 1A/S-522, 1B/S-522, 3A, 3B,3A/R, 3B/R, 3A/RA and 3B/RA.

SB 24-8 Apr 1965 - O 24 Introduction of stiffening flange to alternatorvoltage control unit mounting plate.

Series 1

SB 24-80 Dec 1970 - I 24 Starter/Generator contactor D16401. Threadschanged on auxiliary switch operating rod andassociated nuts torque fig shown.

Model DH.125, Series 1A-522, 1A/S-522, 3A,3A/R, 3A/RA and 400A. Model BH.125, Series400A. Model HS.125, Series 1/B-522, 3B, 3B/RAand 400B.





SB 24-80 - INSP Nov 1968 - R 24 DC Generation. Loosening of nuts instarter/generator contactor assy.

Model DH.125, Series 1A-522, 1A/S-522, 3A,3A/R, 3A/RA and 400A. Model BH.125, Series400A. Model HS.125, Series 1/B-522, 3B, 3B/RAand 400B.

SB 24-81 Dec 1968 - R 24 To introduce a rain guard forward of invertorcooling air duct.

Series 3A/RA Post Mod.251804

SB 24-82 Nov 1968 - O 24 To introduce Rotax Mod.SW6855 to startergenerator contactor D13202/1 Box formationshroud redesigned.

Series 1, 1A, 1A-522, 1B, 1B-522, 1B/S-522(25090) and 1B/R-522 (25094).

SB 24-83 Nov 1968 - I 24 Starter Generation.To introduce RotaxMod.R6934 to BC0107/2 and BC0108/2 andMod.4480B to BC0104/1 and BC0106 Airspout.

Series 1, 1A, 1A-522, 1A/S-522, 1B, 1B-522,1B/S-522, 1B/R-522, 3A, 3A/R, 3A/RA, 3B,3B/RA, 400A and 400B.

SB 24-84 May 1970 - O 24 Introduces Rotax alternator Mod.R6925. Model DH.125, Series 1A, 1A-522, 1A/S-522, 3A,3A/R, 3A/RA and 400A. Model HS.125, Series 1,1B, 1B-522, 1B/R-522, 1B/S-522, 3B, 3B/RA and400B.

SB 24-85 Dec 1968 - I 24 Starter Generator Contactor D16401. Tointroduce Rotax Mod.4449D Series coil andrelay assy have brass brushes instead ofstainless steel.

Series 1A-522, 1A/S-522, 1B-522, 1B/S-522, 3A,3A/R, 3A/RA, 3B, 3B/RA, 400A and 400B (PostMod.251335).

SB 24-86 Nov 1968 - I 24 Windscreen wiper motor suppression unitZA20101. Introduction of Rotax Mod.4483D.New capacitors are added to reduce failure.

Series 1, 1A, 1A-522, 1A/S-522, 1B, 1B-522,1B/S-522, 1B/R-522, 3A, 3A/R,3A/RA, 3B/RA,400A and 400B

SB 24-87 Mar 1970 1 I 24 To introduce Rotax Mod.4401D to switchingunits F6811.

Series 1 1A 1A-522 1A/S-522 1B 1B-5221B/S-522 1B/R-522 3A 3A/R 3A/RA 3B 3B/RA400A 400B

SB 24-88 Feb 1969 - I 24 Engel & Gibbs Temperature Switch QS8320/1in lieu of QS8320 for starter/generator. Theswitch case is strengthened at the head.

Series 3A/R, 3B (25145- 147), 3A/RA, 3B/RA,400A and 400B

SB 24-89 Oct 1970 1 I 24 Generator switching unit Cable from in maincasing assy is secured with P-clip to stop cablefouling of over-ride spindle.

Series 1, 1A, 1A-522, 1B, 1B-522, 1B/R-522,1B/S-522, 3A, 3A/R, 3A/RA, 3B, 3B/RA, 400Aand 400B

SB 24-90 Feb 1969 - R 24 To prevent the warning light on high pressurecock handle remaining illuminated when thecock is selected closed.






SB 24-91 Jun 1969 1 R 24 Introduction of Rotax alternator Mod.R6944. Series 1, 1A, 1A-522, 1A/S-522, 1B, 1B-522,1B/R-522, 1B/S-522, 3A, 3B, 3A/R, 3A/RA,3B/RA, 400A and 400B

SB 24-92 Sep 1970 2 O 24 Generator cables. To introduce a clamp onheavy duty cables of LH generator. To preventthe possibility of the LH generator cables beingwrongly connected.

Series 1, 1A, 1A-522, 1A/S-522, 1B, 1B-522,1B/S-522, 1B/R-522, 3A, #B, 3A/R, 3B/R, 3A/RAand 3B/RA (Pre 251721)

SB 24-93 Mar 1969 - O 24 Introduction of over-voltage unit Pt No. AE5611into inverter AC output feeders.

Series 3A/RA, 3B/RA, 400A and 400B PostMod.251804

SB 24-94 Jul 1969 1 R 24 DC Generation. Protective cover introduced fortype KI-VGH 3.3ohm resistor on panel GK toprevent the resistor being shorted by tool.

Series 3A, 3A/R, 3A/RA, 3B, 3B/RA, 400A and400B.

SB 24-95 Apr 1969 - O 24 Voltage Regulators. To introduce RotaxMod.4396D to voltage regulators U6112.

Series 1, 1A, 1A-522, 1A/S-522, 1B, 1B-522,1B/S-522, 1B/R-522, 3A, 3A/R, 3A/RA, 3B,3B/RA, 400A and 400B

SB 24-96 Oct 1969 1 R 24 Introduction of Rotax alternator Mod.R6940. Series 1, 1A, 1A-522, 1A/S-522, 1B, 1B-522,1B/S-522, 1B/R-522, 3A, 3A/R, 3A/RA, 3B,3B/RA, 400A and 400B

SB 24-97 Jul 1969 - I 24 Introduction of brackets with revised spigotlocations and two re-positioned anchor nuts.

Series 1A, 1A-522, 1B, 1B-522, 1B/S-522, 3A,3A/R and 3A/RA (Pre Mod.251804).

SB 24-98 May 1969 - I 24 Starter/Generators. To introduce RotaxMod.4405B to starter generator BC0104/1.New armature assembly introduced withstrengthened shaft.

Series 1, 1A and 1B

SB 24-99 Dec 1969 1 R 24 DC Generation. To introduce diode networkbetween PE busbar and No.3 battery busbarand 70 amp circuit breaker in lieu of 50 amp.

Series 3A/RA, 3B/RA, 400A and 400B PostMod.251728 (To simplify engine starting circuit).

SB 24-A258 Sep 1986 - M 24 Electrical Power - Cable Installation - Chafingof Wiring Loom at Panel ZK

Applicable to all BAe 125 aircraft Series 800A and800B.

SB 24-A261 Aug 1987 1 M 24 Electrical power - Cable installation - Chafing ofwire at panel ZL

Applicable to BAe/HS/BH/DH 125 aircraft (PreMod.253204), Series 1A, 1A/S, 3A, 3A/RA, 400A,600A, 700A and 700B. All Series f1B, F3B,f#B/RA, F400B and F600B retrofitted with GarrettTFE 731-3 engines.





SB 24-A278 Jul 1990 - M 24 Electrical Power - DC Generation System -Inspection of generator control unit earth wireat starter generator terminal block

Applicable to DH/BH/HS/BAe 125 aircraft whichare pre-mod. 253159, Series 800A, 800B, 700Aand 700B. All earlier series aircraft retrofitted withGarrett TFE 731 engines.

SB 24-A65 Dec 1967 - R 24 Constant Frequency System to Mods.251201or 251335 power supply cable to No2 inverterdamaged by chafing on frames 21/22.

Applicable to HS.125 aircraft Series 1A, 3A, 3A/Rand 3A/RA.





ATA Chapter 25Equipment/Furnishings

SB 25-1 Dec 1964 1 O 25 To introduce terminal block in wiring at controlpedestal.

Series 1B

SB 25-12 Apr 1973 - O 25 Transferred to SB 11-008 (Mod 251785). Series 1A, 1B pre mod.251301 and 3A aircraft

SB 25-13 Apr 1967 - R 25 To introduce cover over gust lock aperture incockpit LH trim panel.

Series 1A and 3A

SB 25-14 Sep 1967 - R 25 To introduce modified sound proofing in way ofdischarge valves on rear pressure bulkhead.

Series 3B

SB 25-15 Feb 1968 - R 25 To introduce improved inner guard belowforward vestibule cabinet.

Series 3B with mod.251764 Part B, 3B/R and3B/RA

SB 25-16 Dec 1969 1 R 25 To introduce a guard on the LP cock operatinglever.

Series 1, 1A, 1A-522, 1A/S-522, 1B, 1B-522,1B/S-522, 1B/R-522, 3A, 3A/R, 3A/RA, 3B,3B/RA, plus 25062 and 25069

SB 25-19 Nov 1969 2 O 25 To introduce flexible pipe covers in rearfuselage equipment bay.

Series 1, 1A, 1A-522, 1A/S-522, 1B, 1B-522 and1B/S-522

SB 25-2 Jun 1965 - M 25 To introduce Mills Equipment Mod.ME/3 onpassenger seat belt ME/2095.

Series 1B (25015 only).

SB 25-20 Dec 1969 - O 25 To introduce protective cover over diode stripsin vertical radio junction box.


SB 25-21 Mar 1970 1 R 25 Radio Rack Assembly at captain's seat.Elimination of anchor nut at inboard end ofmounting beams.

Series 1 1A 1B 1B/S 1B/R 3B 3B/R 3B/RA

SB 25-22 Jun 1971 1 R 25 Control Pedestal. To ensure clearancebetween airbrake cable and trim box.

Model DH.125, Series 1A, 1A-522, 1A/S-522, 3A,3A/R, 3A/RA and 400A. Model HS.125, Series 1,1-521, 1B, 1B-522, 1B/R-522, 1B/S-522, 3B and3B/RA.

SB 25-24 Aug 1971 - R 25 Insulation Blanket on Bulkhead 1. Possibility ofdamage to soundproofing insulation blanketfrom O/heated windscreen wiper resistor.

Applicable to HS/DH 125 aircraft, Series 1, 1A,1A-522, 1A/S-522, 1B, 1B-522, 1B/R-522,1B/S-522, 3A, 3A/R, 3A/RA, 3B, 3B/RA, 400Aand 400B

SB 25-25 Nov 1971 - R 25 Radio Guard Panels. Obstruction of ventilationgrilles in forward luggage compartment.

Applicable to HS 125 aircraft Series 400B





SB 25-26 Dec 1972 - O 25 Cabin Window Blinds. Change of blindoperation from folding to rolling.

Not Specified in Service Bulletin

SB 25-27 Nov 1973 2 O 25 To revise cabin interior layout electrics andaudio system.

The aircraft affected is 25/067

SB 25-28 Apr 1973 - O 25 Cabin windows blinds. To introduce "Levelor"woven aluminium blinds with pre-coiled springsand guide in stowage areas.

Model HS.125, Series 3B/RA

SB 25-29 May 1975 - O 25 Rumbold Seats series M1300 and M1350. Toavoid the necessity for repeat inspections thesubject stiffnut is replaced.

Model HS.125, Series 3B/RA, 400B, 401B and403B.

SB 25-29 - INSP May 1973 - R 25 Rumbold Passenger seat. Incorrect assemblyand loss of nuts securing seat belt anchorageeye bolts.

Model HS.125, Series 3B/RA, 400B, 401B and403B.

SB 25-30 Nov 1973 - R 25 Cockpit ashtrays. Unsealed holes in base. Applicable to HS/DH/BH 125 aircraft Series 3A,3B, 400A, 400B and all variants, 600A and 600B

SB 25-3026 Jul 1998 - O 25 Equipment/Furnishings - Introduction of anadditional cockpit door hold open hook to theforward luggage bay

HS 125 Series 600, Romanian registeredairplane, Serial Number 256024

SB 25-31 Sep 1974 - O 25 Rumbold swivel seats. Introduced to replacethe fixed seats to meet customer's specialrequirements.

Series 600B (A/C 256039)

SB 25-32 Oct 1975 2 R 25 To introduce placarding and changes in thetoilet compartment and meet requirements ofCAA Airworthiness Notice No 83.

Model HS.125, Seris 1, 1-521, 1B, 1B-522,1B/R-522, 1B/S-522, 3B, 3B/RA, 400B, 401B,403B and 600B

SB 25-3493 Apr 2002 - M 25 Equipment Furnishings - Introduction Of NewAllowable Load Placards

Hawker 800XP Serial No’s 258296, 258304,258309, 258311, 258327, 258330, 258338,258340, 258355, 258361, 258362, 258365,258368, 258375, 258378, 258379, 258380,258387, 258388, 258390, 258391, 258392,258393, 258396, 258398, 258399, 258403,258404, 258409, 258411, 258416, 258420,258422, 258424, 258429, 258430, 258433,258435, 258436, 258439, 258441, 258449,258452, 258457, 258463, 258468, 258472,258474, 258479, 258482, 258486, 258492,258499, 258502, 258504, 258505, 258508,258511 and 258517.





SB 25-3494 Apr 2002 - O 25 Equipment Furnishings - Introduction OfImproved Cargo Strap Assembly For TheThree Place Divan

Part A: Hawker 800XP Serial No’s 258296,258304, 258309, 258311, 258327, 258330,258338, 258340, 258355, 258361, 258362,258365, 258368, 258375, 258378, 258379,258380, 258387, 258388, 258390, 258391,258392, 258393, 258396, 258398, 258399,258403, 25840

SB 25-3568 Feb 2004 - M 25 Equipment/Furnishings - Modification of DACircuit Breaker Panel Door

Hawker 800XP, Serials 258293, 258294, 258320,258322, 258324, 258326, 258327, 258329,258331, 258332, 258349, 258358, 258363,258364, 258368, 258369, 258371, 258374,258378, 258380, 258383, 258384, 258386,258395, 258397, 258400, 258402, 258405,258406, 258410, 258411, 258413, 258414,258417, 258419, 258420, 258423, 258425,258426, 258428, 258437, 258441, 258448,258449, 258450, 258451, 258453, 258454,258455, 258456, 258458, 258460, 258461,258466, 258473, 258476, 258477, 258478,258483, 258484, 258487, 258490, 258492,258494, 258495, 258496, 258498, 258500,258502, 258503, 258507, 258508, 258509,258510, 258514, 258515, 258516, 258518,258520, 258521, 258522, 258524, 258527,258529, 258531, 258532, 258534, 258537,258541, 258543, 258544, 258546, 258548,258549, 258550, 258552, 258555, 258556,258558, 258559, 258562, 258565, 258566,258567, 258568, 258569, 258571, 258572,258574, 258578, 258580, 258581, 258582 and258583.

SB 25-3665 Jun 2007 - O 25 Equipment/Furnishings - Lavatory WaterSwitch Modification

Hawker 800XP, Serial Numbers 258377, 258391,258396 to 258669 and 258671 through 258698.

SB 25-3687 Oct 2004 - M 25 Equipment/Furnishings - Microwave OvenModification

Hawker 800XP, Serials 258612, 258615, 258617through 258625, 258627, 258628, 258630,258632 through 258639, 258641 through 258655,258657 through 258662, 258665 through 258672,258674 through 258682, 258684, 258687 and258689 equipped with TIA Wavejet SL

SB 25-37 Apr 1975 - R 25 Galley Boiling Water System. Mechanicallyoperated valves replace fluid actuated valves toprevent contamination of water.






SB 25-3704 Mar 2005 - R 25 Equipment/Furnishings - Prevention ofMoisture Ingress into Emergency

Hawker 800XP equipped with Proline 21; Serials258541, 258556 and 258567 through 258704.

SB 25-3707 Mar 2005 - O 25 Equipment/Furnishings - Artex EmergencyLocator Transmitter (ELT) Wiring

Hawker 800XP equipped with Proline 21; Serials258541, 258556 and 258567 through 258719.

SB 25-3736 May 2006 - O 25 Equipment/Furnishings - Cabin MonitorReplacement

Hawker 800XP, if equipped with the AudioInternational 14.2" cabin monitor(s).

SB 25-3758 Jun 2006 - M 25 Equipment/Furnishings - Galley Power CircuitProtection Improvement

Raytheon Aircraft Model 400A Beechjet, SerialsRK-98 and RK-110 through RK-353; RaytheonAircraft Model 400A (Hawker 400XP) Beechjet,Serials RK-354 through RK-364, RK-367, RK-369through RK-375, RK-378 through RK-386,RK-388 through RK-396, RK-399, RK-400 andRK-406

SB 25-3760 Jan 2006 - O 25 Equipment/Furnishings - Spares Replacementof Lavatory Water Timer Relay

Hawker 800 and 800XP, Serials through 258747if equipped with STC ST08991SC and/orSTCST09651SC.

SB 25-3796 Dec 2006 - O 25 Equipment/Furnishings - PPI P/N 20918-59and P/N 20918-63 Forward Closet AssemblyProduct Improvement

Raytheon Aircraft Model 400A Beechjet (Hawker400XP), Serials RK-380 through RK-461 withPrecision Pattern, Inc., P/N 20918-59 or P/N20918-63 right hand forward closet assemblyinstalled.

SB 25-3808 Jun 2006 - M 25 Equipment/Furnishings - Inspection of SeatBelt Restraint System End Release Buckle

Hawker 800XP, Serial Numbers 258722, 258729,258736, 258737, 258738 through 258748,258750, 258753, 258757, 258761 and 258762

SB 25-3823 Jan 2008 1 M 25 Equipment/Furnishings -Inspection/Replacement of Seat Belt Shackle

BAe.125 Series 800A; Hawker 800; Hawker800XP and Hawker 850XP, Serial Numbers258001 through 258798 and 258802, withDeCrane Swivel Chairs. Hawker Series 1000,Serial Numbers 259002 through 259052, withDeCrane Swivel Chairs. NOTE: This ServiceBulletin does not apply to BAe.125 Series 800A(U-125) and Hawker 800 (U-125A) aircraft. If youare no longer in possession of the airplane,please forward this information to the presentowner.

SB 25-3852 Oct 2007 - O 25 Equipment/Furnishings – Installation ofImproved Toilet Assembly (P/N 500-31A-3)

Model 400A, Beechjet, Serials RK-98, RK-110through RK-353; Model 400A, (Hawker 400XP),Serials RK-354 through RK-542.





SB 25-4 Feb 1966 - O 25 To introduce modified pull down roller blinds oncabin windows.

Series 1B (25015 only)

SB 25-41 Jun 1976 - O 25 Soundproofing. Additional soundproofingadded to vestibule overhead areas.


SB 25-45 Dec 1981 - M 25 Flight Compartment. Introduction of shorterarmrest for Ipeco seat. Restriction ofhandwheel movement can occur with the seatforward.

Model HS/BAe.125, Series 700B and 700A- PostMod.258370

SB 25-46 Nov 1981 - R 25 Flight Compartment. Hand fire extinguisher andtorch relocated on LH bulkhead.

Model HS/BAe.125- Post Mod.252739, Series700A and 700B.

SB 25-47 Sep 1982 - O 25 Flight Compartment. To introduce grilles ininstrument panel coaming to improve aircirculation behind instrument panel.

Applicable to 700A and 700B.

SB 25-48 Oct 1982 - I 25 Buffet / Galley. To introduce Sonceboz hot-cuptime switch as replacement for Venner PTBtime switch.

Model HS.125, Series 1, 3, 400 and all variants.

SB 25-49 Jun 1984 - I 25 Equipment/furnishing - Crew seat inertia ReelD73766/002 with improved torsion spring toTeleflex SB 25-00-18542 issue 2

All Series with crew seats of Series or TeleflexMorse Standard

SB 25-5 Dec 1970 2 M 25 Equipment Furnishing - Emergency - Life jacket50C Mk2. Introduction of R.F.D. Modification862


SB 25-50 Sep 1985 1 O 25 To retrospectively replace Metair door latch01-30-9 with Metair door latch 30-114 on toiletdoors with and without a mirror on aft face.

Applicable to DH/BH/HS.125 aircraft, Series400A, F400B, 600B, 700A and 700B

SB 25-51 Apr 1986 - O 25 Passenger Seats M2500 Series-Armrestsstrengthened to Rumbold SB NoM2500-25-538.

Model BAe.125 Seris 700B and 800B

SB 25-52 Jan 1986 - I 25 Equipment/Furnishings - Revised toilet tissueholder

All HS.125 Series 700B. Model BAe.125 Series800B up to and including 258028.

SB 25-54 Aug 1989 1 M 25 Equipment/furnishings – Warming oven –Introduce warming oven part nos.255D-LH-28/115, 255D-RH-28/115 and255-362A with overheat protection

All Series with oven 255B-LH-28/115,255B-RH-28/115 and 255-362









SB 25-59 Dec 1989 - R 25 Restricted - See Remarks Series 800A (A/C 258129 131 134 154 156 158)

SB 25-6 Oct 1966 1 R 25 Flight Compartment. To provide a stop whichensures that the emptying shutter on crewashtray is fully closed when fitted to A/C.

Series 1, 1A and 1B



SB 25-62 Jul 1991 2 O 25 Equipment/Furnishing - Forward Luggage Bay -To introduce sealing of the shelf area


SB 25-63 - 259555K Oct 1990 1 R 25 Restricted - See Remarks Series 800A (A/C 258129 131 134 154 156 158)

SB 25-63 - 259555L Oct 1990 1 R 25 Restricted - See Remarks Series 800A (A/C 258129 131 134 154 156 158)

SB 25-64 Aug 1992 - M 25 Equipment/furnishings - Warming oven -Introduce warming oven part No.206D-LH-28/115 with overheat protection

Series 125 aircraft fitted with Warning Oven PartNo.206B-LH-28/115

SB 25-65 Jul 1990 - R 25 Restricted - See Remarks Series 800A (A/C 258158)

SB 25-66 May 1991 - R 25 Equipment and Furnishings - Inspection forcorrect third crew seat belt arrangement

Applicable to BAe 125 Series 800 aircraftpost-mod.259137

SB 25-67 May 1992 4 M 25 Equipment/Furnishings - To introduce animproved washbasin watertank shroud drainoutlet


SB 25-68 Aug 1992 - M 25 Equipment Furnishings - Installation ofimproved forward cabin door retainer catch

Series 800

SB 25-7 Nov 1970 1 O 25 To introduce Strabor Mod. to airscalators.D11342.

Series 1, 1B, 1B/S-522 and 3B

SB 25-70 Oct 1992 - R 25 Equipment/Furnishing - Control pedestal - Tointroduce revised operating point for the throttlelever reverse thrust deploy microswitch

Series 1000 Pre Mod. 253600A

SB 25-71 Oct 1992 - R 25 Control Pedestal. Introduction of clearancecheck of the reverse thrust lever baulk.

Series 1000- Pre-Mod.253621A





SB 25-72 Oct 1992 - R 25 Equipment/Furnishings - Control Pedestal -Introduction of revised rigging instructions foraileron/elevator gust lock

Series 1000- Pre Mod.253615A

SB 25-74 Jun 1993 - R 25 Equipment/Furnishings - Control Pedestal -Introduction of a Flap Lever/Gate with a baulkat Zero Degrees

Series 1000

SB 25-75 Feb 1994 - M 25 Power Supply. To introduce uprated galleyfeeder cables and change the rating of thetoilet services fuse F3.


SB 25-76 Feb 1994 - M 25 Power Supply - To introduce uprated left galleyand right galley feeder cables and change therating of the toilet services fuse F3


SB 25-77 Mar 1994 - O 25 To introduce an AMC beverage maker andassociated electrics in open plan galley.


SB 25-8 Dec 1966 - R 25 Rear equipment bay. Clearance of coverassemblies.

Applicable to HS.125 aircraft, all Series

SB 25-80 Apr 1994 - R 25 Equipment/Furnishings - Panel DA -Introduction of modified trim panels for EngineDiagnostic System (EDS) display unit

BAe 125 Series 1000B (excluding aircraft259024) which are Post Mod.253364A,B,C,D andD.

SB 25-81 Apr 1997 - I 25 To introduce radio frequency screening toentertainment module


SB 25-82 Nov 1994 - O 25 Equipment/Furnishing - To introducemiscellaneous changes to the aircraft interiortrim, soundproofing and exterior paint

BAe 125 Series 800B (258002)

SB 25-83 Jan 1995 - I 25 Restricted - See Remarks BAe 125 Series 800A U-125 (258215)

SB 25-84 Jan 1995 - I 25 Restricted - See Remarks BAe 125 Series 800A U-125 (258215)

SB 25-85 Jan 1995 - I 25 Restricted - See Remarks BAe 125 Series 800A U-125 (A/C258215)

SB 25-86 Apr 1995 - R 25 Restricted - See Remarks Hawker 800 U-125A (258245, 258247, 258250,258268)

SB 25-87 Feb 1995 - I 25 Restricted - See Remarks Hawker 800 U-125A (258247, 258250)

SB 25-88 Jan 1996 - R 25 Restricted - See Remarks Hawker 800 U-125A (258245, 258247, 258250)

SB 25-89 Jan 1996 - O 25 Restricted - See Remarks Hawker 800 U-125A (258245, 258247 and258250)





SB 25-9 Jun 1967 2 R 25 To introduce rubbing strip on main entry doortrim.

Series 1, 1B, 3 and 3B

SB 25-90 Jan 1996 - O 25 Restricted - See Remarks Series 800 U-125A (A/C 258245, 258247,258250)


SB 25-92 Jan 1996 - R 25 Restricted - See Remarks Series 800 U-125A (A/C 258245, 258247,258250)



SB 25-95 Apr 1997 - M 25 To introduce sealed anchor nuts in place of thestandard type for the fire axe provision locatedon the forward face of 'DA' panel in the flightdeck

BAe 125 Series 1000A, 1000B (A/C 258151,258159, 259003 to 259042). Hawker 1000 (A/C259043 to 259052)

SB 25-96 Aug 1996 - O 25 Equipment/Furnishings: To introduce filtercapacitors to the AMC beverage maker.

BAe 125 Series 800A, 800B, 1000A, 1000B,Hawker 800 and 1000.

SB 25-999 Mar 1976 - M 25 IRVIN passenger safety belts AB5 and AB6series. Inspection of buckle base for cracks atbend radius

All Series Pre 700B with IRVIN belts AB5 or 6supplied prior to 1 Mar 76





ATA Chapter 26Fire Protection

SB 26-1 Nov 1964 1 M 26 Fire extinguisher top cap. Applicable to HS.125, all series

SB 26-10 Feb 1969 - I 26 To introduce Graviner Mod.A/DS1919 tofirewire triple FD Control unit 165D(4).

Series 1, 1A, 1A-522, 1A/S-522, 1B, 1B-522,1B/R-522, 1B/S-522, 3, 3A, 3A/R, 3A/RA, 3B,3B/RA, 400A and 400B.

SB 26-11 Jan 1969 - O 26 Fire Detection and Warning. To re-positionfirewire clips on centre frame at zone 2 cowling.


SB 26-12 Jun 1969 - I 26 To introduce an improved range of Gravinerfirewire element accessories Pt. A - M STermination fitting Pt. B - Flange coupling.


SB 26-13 Nov 1970 - I 26 Introduces pressure diversion in the operatinghead of automatic fire extinguishers 132A(Graviner Mod.2 SB 26-29).


SB 26-14 Oct 1969 - R 26 APU fire extinguisher installation(Mod.251605). Extinguisher bottle too close toengine dual head fire extinguisher.

Applicable to HS.125 aircraft Series 1B, 1B-522,1B/R-522, 1B/S-522, 3B, 3B/R, 3B/RA and 400Bwith Mod.25/1603 incoporated

SB 26-15 Nov 1973 - R 26 Fire Protection - Auxiliary Power Unit - Possibleblanking of extinguishant discharge nozzle

Applicable HS.125 aircraft B Series fitted withAiresearch Auxiliary Power Unit (Mod.251605)

SB 26-16 Mar 1974 - R 26 Fire extinguisher switches. Possibility of baulkfouling and preventing switch operation.

Applicable to HS/BH 125 aircraft, Series 600Aand 600B, pre mod.25/2373

SB 26-20 Jun 1975 - O 26 Detection. To introduce improved firewireretention in engine zone 2 cowling. Existingferobestos clamps replaced by all metal ones.

Model DH.125, Series 1A, 1A-522, 1A/S-522, 3A,3A/RA, 400A and 400A/C. Model BH.125, Series400A and 600A. Model HS.125, Series 1, 1-521,1B, 1B-522, 1B/R-522, 1B/S-522, 3B, 3B/RA,3B/RC, 400B, 401B, 403B and 600B.

SB 26-21 Dec 1977 - R 26 Overheat Detection. Cables in engine pylonchafing on structure.

Applicable to HS.125 Series 700 aircraft withoutmod.25/2649 and to Series 600F aircraft 25258.

SB 26-23 Jun 1982 1 I 26 Fire protection - Portable hand operatedextinguisher BA 51015 replaces existingPA.BCF

Model DH/HS.125, Series 1, 3 and all variants.Model HS/BH.125, Series 400, 401, 403, 600 andall variants. Model HS.125, Series 700 and allvariants.





SB 26-24 May 1982 1 O 26 Fire protection - Fire detection and warning -Introduction of series 5 HSRS type overheatdetectors

Models DH/HS/BH/BAe.125 Series 1, 1AS-522, 3,3B, 3BRA, 3BRC, 400, 400A, 400B, 403B, 500,600A, 600B, 700, 700A and 700B.

SB 26-26 Feb 1986 - M 26 Fire Protection System - Fire detector boxcabling

BAe.125 Series 800A and 800B

SB 26-27 May 1986 - M 26 Fire Protection - Fire Warning System -Inspection for possible incorrect crimping ofsocket contacts in connectors TA7 and TB7 inthe Fire Warning System.

Applicable to BAe 125 Series 800A and 800B

SB 26-28 May 1988 - M 26 Fire Protection - Engine Fire Extinguisher -Inspection of discharge outlets fitted to H.T.L.Fire bottle assemblies

Applicable to DH/HS/BH/BAe 125 aircraft, Series700, 800 and all Series retrofitted with GarrettTFE 731-3 engines

SB 26-29 Jul 1990 - R 26 Fire Protection - Extinguishing - Possiblefouling of elevator cable by 2nd shotextinguisher pipe assembly

Applicable to all BAe 125 Series 800A and 800Bwhich are pre-mod.253253A

SB 26-3 Dec 1966 - R 26 Fire Detection and Warning. Revised routing offire wire cable in rear engines cowling on A/Cwith Viper 522 engines.

Series 1A, 1B, 3, 3A and 3B

SB 26-30 Nov 1990 - I 26 Fire protection - Extinguishing - Inspection ofportable fire extinguishers

Applicable to all DH/BH/HS/BAe 125 aircraftequiped with Fire Fighting Enterprises (U.K.) Lts.portable fire extinguishers.

SB 26-3002 Mar 1998 1 M 26 Fire Protection - Removal of fire extinguisherpipe to the APU fuel control enclosure

BAe 125 Series 800A, 800B, 1000, 1000A and1000B.

SB 26-31 Feb 1991 - M 26 Fire Protection - Inspection of engine fireextinguisher electrical connections for security,identification tags and wire locking

Applicable to all BAe 125 800 Series, 700 Seriesand earlier series retro-fitted with Garrett engineswhich are pre-mod.253274A

SB 26-3147 Oct 1998 1 M 26 Fire Protection. Inspection of aircraft lavatoryfire extinguisher (Halon) for serviceability(weight check).

All BAe Series 1000A and Hawker 1000 aircraft

SB 26-3197 Apr 1998 - M 26 Fire Protection - Inspection of Engine FireExtinguisher discharge tubes

Hawker 800XP and 800 U-125A (JASDF)

SB 26-32 Jul 1992 - R 26 Fire Protection - Auxiliary Power Unit Firebottle- Introduction of revised terminal identificationat the APU firebottle positive terminals

Series 800 Post Mod.259404B and Series 1000Post Mod.259722A





SB 26-33 Feb 1993 1 M 26 Fire protection - Inspection of blocking diodesassociated with 'EXT FIRED' (bottle gone),indicators for failure

All Series up to and including 800 (and A/C258159)

SB 26-3323 Oct 1999 - O 26 Fire Protection - Introduction of a replacementFire Warning Bell

BH/HS/BAe 125 Series 600A/600B and700A/700B which are Post Mod. 252739 and252825. BAe 125 Series 800A/800B; Hawker800, and Hawker 800XP which are Pre Mod.25F566A.

SB 26-3378 Sep 2000 1 O 26 Fire Protection - Fire Warning BellReplacement

All BAe 125 1000A/1000B and Hawker 1000aircraft equipped with Panel P/N A1-FN-051 orMod. 253361A or Mod. 006717.

SB 26-34 Apr 1993 1 I 26 Fire protection - Flight deck - Introduction ofportable fire extinguisher BA51015-3 with astronger operating trigger

Series 1, 3, 400 and 600 including Garrett Engineretrofits Post Mod.252739. Series 700 PostMod.252739. Series 800 and 1000.

SB 26-3496 Nov 2003 - M 26 Fire protection - Introduction of electrical wireprotection kit

DH.125 Series 1A; DH.125 Series 1A/S-522;DH.125 Series 3A; DH.125 Series 3A/R; DH.125Series 3A/RA; HS. 125 Series F3B; HS.125Series F3b/RA; BH. 125 Series 400A; DH.125Series 400A; HS.125 Series F400B; HS.125Series F403B; BH. 125 Series 600A and HS.125Series F600B. All HS. 125 Series 700A and HS.125 Series 700B; BAe.125 Series 800A; BAe.125Series 800A (C-29A); BAe.125 Series 800A(U-125); BAe.125 Series 800 B; All Hawker 800and Hawker 800 (U-125A), Serials through258445; All Hawker 800XP, Serials through258519.

SB 26-35 Apr 1993 1 I 26 Fire protection - Introduction of portable fireextingisher BA51015-3 and BA61016WG-3with a stronger operating trigger

Series 400, 600, 700, 800 and 1000.

SB 26-36 Nov 1994 - O 26 Fire Protection - Extinguishing - Introduction ofMain Engine Fire Bottles with visual pressureIndication

BAe 125 Series 1000A and 1000B and Hawker1000

SB 26-3610 Sep 2003 1 M 26 Fire Protection - Addition of Fire Extinguishermarker bands for improved identification

BAe.125 Series 800A; BAe.125 Series800A(C-29A); BAe.125 Series800A(U-125);BAe.125 Series 800B; Hawker 800;Hawker 800(U-125A); Hawker 800XP: Serials258001 through 258609 and 258611 through258615.





SB 26-37 Oct 1996 1 O 26 Fire bottles - Extinguishing - Introduction ofmain fire bottles with visual pressure indication

Models DH/BH/HS.125 Series 1 up to andincluding 700. Hawker 800 and 800XP.

SB 26-3803 Oct 2006 - R 26 Fire Protection – Inspection/Replacement ofMeggitt Thermistor Detectors and theassociated attachment - Meggitt (MSSI)

(1) Airplanes Model 400A (Hawker 400XP),Serials RK-437 through RK-467 which have P/N244-25282 thermistor detectors installed withserial numbers listed in Meggitt Safety Systems,Inc. (MSSI) Service Bulletin 26-36, dated June 15,2006. Model 400A (Hawker 400XP), SerialsRK-354 through RK-436 in which P/N 244-25282thermistor detectors have been installed betweenJune 13, 2005, to August 31, 2006, with serialnumbers listed in Meggitt Safety Systems, Inc.(MSSI) Service Bulletin 26-36, dated June 15,2006. Model 400A, Serials RK-1 through RK-353in which P/N 244-25282 thermistor detectors havebeen installed between June 13, 2005, to August31, 2006, with serial numbers listed in MeggittSafety Systems, Inc. (MSSI) Service Bulletin26-36, dated June 15, 2006. Model 400, SerialsRJ-1 through RJ-65 in which P/N 244-25282thermistor detectors have been installed betweenJune 13, 2005, to August 31, 2006, with serialnumbers listed in Meggitt Safety Systems, Inc.(MSSI) Service Bulletin 26-36, dated June 15,2006. Model MU-300, Serials A003SA throughA091SA in which P/N 244-25282 thermistordetectors have been installed between June 13,2005, to August 31, 2006, with serial numberslisted in Meggitt Safety Systems, Inc. (MSSI)Service Bulletin 26-36, dated June 15, 2006.

SB 26-39 Sep 1996 - M 26 Fire protection - Inspection of aircraft fireextinguishers, fire bottles, fire detectors andsmoke detectors for serviceability

Applicable to all DH/BH/HS/BAe 125 Series1A/1B, 3A/3B,400A/400B. 600A/600B,700A./700B: 800A/800B/Hawker 800 including800 XP and Major Variants C29A, U125, U125A:1000A/1000B and Hawker 1000 aircraft.

SB 26-4 Jan 1967 - R 26 Fire Extinguishing System. Inadvertentdischarging of fire extinguishers.


SB 26-41 Apr 1999 1 R 26 Inspection of aircraft engine fire extinguishersfor correct annotation of the cartridge connectorident sleeves.

Hawker 1000

SB 26-5 Feb 1970 1 O 26 Fire Extinguishing. Introduces copper bottlestype 188A for main engine positions to replacethe existing steel bottles type 142A.






SB 26-6 Feb 1968 - R 26 Detection. To introduce Graviner firewirecontrol unit Pt No.165D in lieu of Pt No. 365D.

Series 1, 1A, 1B, 1A/S-522, 1B/S-522, 3, 3A, 3B,3A/R, 3B/R, 3A/RA and 3B/RA

SB 26-7 Jul 1968 - O 26 Extinguishing. To introduce switchspring-loaded to 'OFF' for the engine fireextinguisher switches.

Series 1 1A 1A/R 1A/S 1B 1B/R 1B/S 3A 3A/R 3B3B/R 3B/RA

SB 26-8 Aug 1968 - I 26 Introduction of strengthened firewire supportclips in zone 2.

Series 1, 1A, 1A-522, 1A/S-522, 1A/R-522, 1B,1B-522, 1B/S-522, 1B/R-522, 3A, 3B, 3A/R, 3B/R,3A/RA and 3B/RA

SB 26-9 Jan 1969 - I 26 To introduce firewire triple FD control unit165D(4) in lieu of 165D(2) (Graviner SB 26-35).

Series 1, 1A, 1A-522, 1B, 1B-522, 1B/S-522,1B/R-522, 3A, 3A/R, 3A/RA, 3B, 3B/RA, 400Aand 400B

SB 26-A17 Jun 1974 - R 26 Leakage of extinguishant from fire extinguisherbottles.

Applicable to HS 125 aircraft all series.

SB 26-A18 Dec 1974 - M 26 Firewire Control Unit. Possible error inelectrical connections. Inspection and test forcrossed connections to terminals 1 and 2.

Applicable to BH/DH/HS 125 aircraft, all series

SB 26-A22 Oct 1978 - R 26 Inability to release switch baulk. Applicable to HS 125 aircraft, Series 600, 700 andall variants

SB 26-A25 Mar 1985 2 M 26 Fire Protection - Fire Extiguishing System -Incorrect Circuit Wiring

Applicable to BAe 125 aircraft, Series 800

SB 26-A5 May 1967 1 M 26 Fire Extinguishing System. Special corrosioninspection and weight check of Gravinerextinguishers type 142A and 132A.

Applicable to HS.125 aircraft, all Series and toextinguishers Graviner types 142A and 132A heldas spares or in stores





ATA Chapter 27Flight Controls

SB 2588 Sep 1996 1 O 27-50 Flight Controls - Main Flap Leading EdgeModification

Beechjet 400, serials RJ-16 through RJ-65;Beechjet 400A, serials RK-1 and after.

SB 27-1 Jan 1965 1 I 27 To improve functioning of flap lever baulklocation for the control column.

Series 1, 1A and 1B

SB 27-10 Jan 1965 1 O 27 To stengthen elevator trim circuit. Series 1, 1A and 1B

SB 27-100 Jul 1972 - R 27 Rudder bias system. Pipe with longer nutsreplaces existing pipe in pod fillet.

Model DH.125, Seris 1A, 1A-522, 1A/S-522, 3A,3A/R, 3A/RA and 400A. Model BH.125, Series400A. Model HS.125, Series 1, 1-521, 1B,1B-522, 1B/R-522, 1B/S-522, 3B, 3B/RA and400B.

SB 27-101 Jun 1972 - R 27 Control cables at rudder servomotor. Applicable to HS/DH/BH 125 aircraft, Series 400Aand 400B.

SB 27-102 Mar 1973 - O 27 Aileron controls. Strengthened geared tabcentre hinge bracket and new bolts attachingconnecting rods to aileron geared tab. Torevise tolerances on tab connecting rod bolt toensure easy installation and removal.

Model DH.125, Series 1A, 1A-522, 1A/S-522, 3A,3A/R, 3A/RA and 400A. Model BH.125, 400A.Model HS.125, Series 1, 1-521, 1B, 1B-522,1B/R-522, 1B/S-522, 3B, 3B/RA and 400B.

SB 27-103 Mar 1973 - I 27 Cables in flap symmetry circuit. Cables of moreflexible material introduced.

Model DH.125, Series 3A/R, 3A/RA and 400A.Model BH.125, Series 400A. Model HS.125,Series 1B/R-522, 3B/RA and 400B

SB 27-104 Mar 1973 - R 27 Flap Hinge Levers. Inspect for damagedprotective treatment corrosion and associatedcracking.

Applicable to HS/DH 125 aircraft Series 1, 1A,1A-522, 1A/S-522, 1B, 1B-522, 1B/S-522, 3A and3B - pre.mod.25/5640.

SB 27-105 May 1973 - R 27 Flap control unit type 614. Introduction ofstandard washer under head of latch leverpivot.

Model DH.125, Series 3A/R, 3A/RA and 400A.Model BH.125, Series 400A and 600A. ModelHS.125, Series 1B/R-522, 3B/RA, 400B, 401B,403B and 600B.

SB 27-106 Jun 1973 - R 27 Possibility of foul between lever and bolt ofaileron position potentiometer.

Applicable to HS/BH-125 aircraft Series 600A and600B fitted with an aileron position potentiometer.

SB 27-107 Dec 1973 - R 27 Rudder Bias System. Air pipes splittingadjacent to the two rear water drains.






SB 27-107 - INSP Dec 1973 - R 27 Rudder bias system. Air pipes splitting adjacentto the two rear water drains.


SB 27-108 Nov 1982 4 R 27 Aileron control system. Ailerons are nowaligned with wing profile to reduce drag.


SB 27-109 Aug 1974 2 R 27 Rudder installation. Possible fouling betweentorque tube and sealing plate.

Applicable to HS/DH/BH 125 aircraft all serieswith mod.25/1248 embodied

SB 27-11 Dec 1964 - I 27 To introduce magnesium alloy pulleys. Series 1A and 1B

SB 27-110 Jul 1974 - R 27 Aileron. Possible omission of drain holes inhorn balance lower skin.

Applicable to HS.125 Series 600A and 600B.

SB 27-112 Mar 1975 1 M 27 Flaps. To strenghten flap in way of inboardhinge internal reinforcing angles.

Model DH.125, 3A/R, 3A/RA and 400A. ModelBH.125, Series 400A and 600A. Model HS.125,Series 1B/R-522, 3B/RA, 400B, 401B, 403B and600B.

SB 27-113 Oct 1974 - R 27 Pulley drum at aileron. Possibility of incorrectlylocated bearing retaining ring.

Model DH.125, Series 1A, 1A-522, 1A/S-522, 3A,3A/R, 3A/RA and 400A. Model BH.125, Series400A and 600A. Model HS.125, Series 1, 1-521,1B, 1B-522, 1B/R-522, 1B/S-522, 3B, 3B/RA,400B, 401B, 403B and 600B.

SB 27-113 - INSP Oct 1974 - R 27 Pulley drum at aileron. Possibility of incorrectlylocated bearing retaining rings allowing pulleydrum movement and fouling.


SB 27-114 Feb 1975 1 R 27 Possible omission of drain holes from aileron,rudder, elevator and flap assemblies.

All Series (up to and incl A/C 256037) except (A/C25274 256029 031 034)

SB 27-12 Jul 1965 - O 27 To introduce simplified joint at flap hinge leverto torque tube end fitting.

Series 1, 1A and 1B

SB 27-120 Jan 1977 - R 27 Rudder bias system. Operation of switch andguard cover.

Applicable to HS/DH/BH 125 aircraft, Series 400,600 and all variants.

SB 27-121 May 1978 - R 27 Rudder bias system. An amber warning light isintroduced on the LH pilots panel to annunciateif rudder bias switch is not selected.

Model DH/HS.125, Series 1, 3 and all variants.Model HS/BH.125, Series 400, 401, 403, 600 andall variants.





SB 27-122 Mar 1977 - M 27 Elevator control pulley bracket at top of fin rearspar. Introduction of longer threadedattachment bolts together with wire locking.

Model DH.125, Series 1A, 1A-522, 1A/S-522, 3A,3A/R, 3A/RA, 400A and 403A(C). Model BH.125,Series BH.125, 400A and 600A. Model HS.125,Series 600A. Model HS.125, Series 1, 1-521, 1B,1B-522, 1B/R-522, 1B/S-522, 3B, 3B/RA, 3B/RC,400B, 403B, 600B and 600F

SB 27-123 Aug 1978 - R 27 Flaps. To introduce flap lever gate and stop toprovide a 45 degee flap LAND setting toreplace existing 50 degree gate.

Model DH/HS.125, Series 1, 3 and all variants.Model HS/BH.125, Series 400, 401, 403 and allvariants.

SB 27-124 Jan 1979 - M 27 To remount the elevator pitch trim switch on thecontrol column hand- wheel, to improve thesense of operation.


SB 27-125 Mar 1979 - M 27 Flap jack assy. Component ultimate lifeLongitudinal cracks on the jack body hasoccured resulting in the loss of Hydraulic Fluid.

Applicable to all HS/DH 125 aircraft series 1, 1A,1B, 3A, 3B and all variants thereofpre-mod.25/5640

SB 27-126 Dec 1979 1 R 27 Flight Controls - To provide improvedsegregation of rudder bias pipes and oxygenbottle screen tube adjacent to frame 24 (portside only)


SB 27-127 Sep 1979 - R 27 Flaps. To simplify rigging of flap synchronisersystem and to improve clearances.

Model DH/HS.125, Series 1, 3 and all variants-post mod. 255640. Model HS/BH.125, Series 400,401, 403, 600 and all variants. Model HS.125,Series 700 and all variants.

SB 27-128 Oct 1979 - R 27 Flight Controls - Elevator control system -Possible foul between cable and static pipeunion

Applicable to HS 125 Series 600B, 700A and700B

SB 27-129 Aug 1980 - R 27 Rudder bias system. To introduce rudder biasstrut AC67042 in lieu of AC64184 To eliminateresidual foot load.

All Series with Garrett TFE 731 engine installationLess the following aircraft whcih had the mod.embodied at aircraft build. Series 700A (NA 0254,0261, 0264, 0277, 0281 and subs.) and 700B(257112 and subs).

SB 27-13 Dec 1970 1 O 27 To introduce Dunlop Mod.M232 on rudder biasstrut AC60188.

Series 1, 1A and 1A-522

SB 27-130 Jun 1981 1 M 27 Flight controls - Aileron, rudder and elevatortrim - Crack check of trim jack input gear shaft

Applicable to HS/DH/BH 125 aircraft all Series upto and including Series 700.





SB 27-131 Jan 1982 1 R 27 Elevator. Incorrect rigging of trim circuit. Applicable to HS/BH 125 aircraft of Series 600A(with mod.252468), 600B, F-600B, 700A(NA03110, NA0313, NA0325, NA0326 andNA0339) and 700B (257142).

SB 27-132 Mar 1982 2 R 27 Flap lift dump. Possible baulk cable foul at LHwheel well.

Applicable to HS 125 aircraft of Series F400B withmod.25829 (pressure refuel/defuel), 700A(NA0305, NA0325, NA0326 and NA0339 exceptNA0218) and 700B (257142).

SB 27-133 Feb 1984 1 R 27 Flight controls - Aileron and airbrake - Possiblecracking of pulley brackets

Applicable to HS/DH/BH 125 all Series up to andinluding Series 400(F-600B aircraft 25258 only).

SB 27-134 Jan 1984 - R 27 Flight controls – Aileron control system –Grease charging point at inboard hingeoperating mechanism


SB 27-135 Mar 1985 - R 27 Flight Controls - Elevator trim - To introduce arevised trim label


SB 27-136 Jun 1985 1 M 27 Flight Controls - Stall ident system - Revisedflap microswitch layshaft


SB 27-137 Nov 1986 2 M 27 Wings - Aileron - Additional riveting to provideimproved structural integrity in the event oflightining strike


SB 27-138 Apr 1986 - M 27 Flight Controls - Aileron centre hinge - Hingelink bush revised to eliminate vertical float incentre hinge link


SB 27-139 Mar 1986 - R 27 Flight Controls - Electrical Power - RudderBias/Battery Vent pipe runs improved betweenframes 21 and 23

Model BAe.125, Series 800A and 800B

SB 27-14 Jul 1965 - I 27 To introduce improved hinge bolt attachment atflap centre hinge.

Series 1, 1A and 1B

SB 27-140 Aug 1986 1 M 27 Flight controls - Flap system - Inspection oftorque shaft assemblies

Applicable to Series DH/HS 125 aircraft Pre Mod.255640, Series 1, 1A, 1B, 3A and 3B fitted withViper or TFE 731 engines.

SB 27-142 Nov 1989 3 M 27 Flying controls - Elevator mass balance -Possible corrosion of balance weight sideplateassy and spigot

Applicable to all BAe/DH/BH/HS 125 aircraft up toand including Series 700 for which a period of 3years or more has elapsed since date ofmanufacture





SB 27-143 May 1988 2 O 27 Flight controls - Rudder - To introduce newrudder quadrant spider assembly

All Series 125 aircraft which are either postmod.251411 or 252908.

SB 27-144 Jul 1988 - R 27 Flight Controls - Airbrake selector lever baulk -System test circuit revised

Series 800A (258007, 258015, 258048 and258087)

SB 27-145 Jun 1989 - R 27 Flight Controls - Control column - Possible foulbetween gaiter attachment bolt and electricalconduit

Applicable to DH/BH/HS/BAe 125 aircraft premod.25/3220, Series 600, 700 and 800

SB 27-146 Sep 1988 - R 27 Flight Controls - Airbrakes - Inspection of LHand RH bell crank assemblies for correctmachining

Applicable to BAe.125 Series 800

SB 27-147 Sep 1988 - R 27 Flight controls - Aileron horn - Ice accretion Applicable to all DH/BH/HS 125 aircraft up to andincluding Series 700A and 700B

SB 27-148 Apr 1989 - R 27 Flight Controls - Aileron - To introduce areplacement connecting rod at the aileron trimjack out of trim micro-switch


SB 27-149 Mar 1989 - M 27 Flight Controls - Stall Identifcation system -Detachment of balance weight insert fromairflow angle sensor vane

Applicable to BAe 125 aircraft Series 800A and800B

SB 27-15 Jun 1965 - O 27 To introduce a new bolt and bushes in thecentre flap hinge arm.


SB 27-150 May 1989 - R 27 Aileron. Possibility of foul between cockpit floorand bolt tail on aileron potentiometer arm.

Applicable to all Series 600 and 700DH/BH/HS/BAe 125 aircraft

SB 27-151 Jun 1989 - R 27 Flight controls - Elevator - Possibledisplacement of elevator cable at frame 7 R.H.

Applicable to all Series DH/BH/HS/BAe 125aircraft.

SB 27-152 Jul 1999 2 R 27 Flight Controls - Introduction of SignalSumming Unit with improved TransientProtection

Model BAe 125 Series 800 (Post Mod.252961G)

SB 27-154 Oct 1990 - O 27 Flight Controls - Airbrake - To introduceairbrake selector lever baulk

Series 800A - Post Mod.253149C

SB 27-155 Aug 1991 - M 27 Flight Controls - Inspection of Rudder pedaltorque tubes for cracking

Applicable to the following BAe 125 Series 800aircraft, Series 800A and 800B.

SB 27-156 Aug 1992 1 R 27 Flight controls - Inspection of rudder pedaladjuster unit for security of gust lock lever andretaining bolts

Applicable to all series DH/BH/HS (1 to 700)aircraft.





SB 27-157 Feb 1995 2 R 27 Flight control - Inspection of rudder bias pipesfor cracking/pitting or contamination underidentification labels

All variants of DH/BH/HS 125 Series 1 to 700Aand 700B aircraft inclusive. Model BAe 125 800Aand B/1000A and B/1000B and Hawker 800/1000aircraft.

SB 27-159 Nov 1993 - R 27 Flight Controls - Aileron - Introduction ofstronger solenoid spring in the ailerondisconnect unit

Series 1000

SB 27-160 Sep 1993 - R 27 Flight Controls - Inspection of ailerondisconnect drum to check setting of solenoidmechanism

Applicable to Hawker 125 Series 1000A and1000B aircraft

SB 27-161 Jul 1994 1 M 27 Inspection of elevator pulley for correctassembly condition.

Applicable to Hawker 1000 and BAe 125 Series1000A and 1000B aircraft.

SB 27-162 Feb 2001 2 O 27 Flight controls - Airbrake - To introducereplacement microswitches by OTTO controlsfor airbrake position sensing

BAe 125 Series 800A, 800B, 1000A and 1000B.Hawker 800, 800XP and Hawker 1000.

SB 27-163 Apr 1994 - R 27 Introduction of scheduled reference speedsbased on Vs 1g.

BAe 125 Series 1000A and 1000B and Hawker1000 aircraft.

SB 27-164 Mar 1996 - R 27 Flight controls - Aileron - To introduce improvedtrim jack input gear shaft

All DH/BH/HS 125 Series 1 up to and includingSeries 700 aircraft.

SB 27-165 Jul 1996 - R 27 Throttle Box Elevator Trim Control System -Introduction of revised elevator trim controllabel.


SB 27-166 Sep 1994 - R 27 Inspection of rudder bias pipe for presence ofdrain hole.

Applicable to BAe 125 Series 600A, 700A and700B aircraft

SB 27-167 Mar 1996 - O 27 Flight controls – Flap screw jacks – Tointroduce carbon fiber friction discs in theno-back mechanism

All Series Mod 255640 252924 253310A

SB 27-168 Jul 1995 - R 27 Flight Controls - Introduction of revised flapscable pulley bracket and fairlead to improvecable clearance at frame 15A

All BAe Series 1000A, 1000B and Hawker 1000aircraft Pre Mod.253705A.

SB 27-168 - INSP Jul 1995 - M 27 Flight Controls - Inspection of flight controlcables and AFT turnbuckles for possiblecrafting on keel subframe 15A

All BAe Series 1000A, 1000B and Hawker 1000aircraft Pre Mod.253705A.

SB 27-169 Mar 1996 - R 27 Flight controls - Elevator - To introduceimproved elevator trim jack input gear shaft

All DH/BH/HS 125 Seris 1 up to and includingSeries 700 aircraft.





SB 27-17 Apr 1965 - I 27 To introduce new elevator aileron and ruddertrim box.

Series 1

SB 27-170 Mar 1996 - R 27 Flight controls - Rudder - To introduceimproved trim jack input gear shaft

All DH/BH/HS 125 Series 1 up to and includingSeries 700 aircraft.

SB 27-172 Mar 1996 - O 27 Airbrake. To introduce airbrake selector leverbaulk.

Model HS.125, Series 700A

SB 27-173 Apr 1996 - M 27 Flight Controls - Inspection of rudder controlsystem for possible unsatisfactory circuit loadsand their cause(s)

Applicable to all aircraft as follows: BAe 125Series 800A, 800B (including BAe 125 Series800B Major Variants C29A and U125), Hawker800 and 800XP.

SB 27-174 Apr 1996 - M 27 To introduce rudder quadrant with 2.82'' rudderbias strut pick up radius superseding thecurrent radius of 2.72''

Hawker 800XP

SB 27-176 May 1997 - M 27 Flight Controls - Inspection of LH and RH wingstall detector vent pipes for presence ofidentification labels and debris in fuel boosterpump screens

Hawker 800XP (258286, 258287,258289 to258295,258298 to 258300, 258302,258303,258307 and 258308)

SB 27-18 May 1965 - I 27 To introduce flap spring strut at servodyne withmore length adjustment.


SB 27-19 Jun 1965 - I 27 To introduce split distance tube in aileroncontrol at rib 10.

Series 1, 1A and 1B

SB 27-2 Dec 1964 1 R 27 To improve functioning of flap lever baulklocation for the control column gaiter.

Series 1, 1A and 1B

SB 27-20 Jul 1965 - O 27 To introduce nylon-coated rudder and elevatordrums and sealed bearings for elevator drum.

Series 1, 1A and 1B

SB 27-21 Jun 1968 2 R 27 Elevator aileron & rudder trim circuits. Tointroduce fairings over lightening hole flanges.

Series 1, 1A and 1B

SB 27-22 Sep 1965 - R 27 Provides increased clearance between lowerairbrake L/E fingers and wing skin.

Series 1A, 1B and 3

SB 27-23 Oct 1965 - R 27 Flap Control System. To chamfer nylonpressure seal on flap control pulley at frame 16.


SB 27-24 Jul 1965 - R 27 To reduce max 'nose down' elevator trim andincrease max 'nose up' elevator trim.

Series 1 1A 1B





SB 27-25 Sep 1965 - I 27 Flaps. To introduce adjustment at flap springstrut and reduce friction.


SB 27-28 Feb 1966 - O 27 Rudder and Rudder trim controls. To introduceshorter hoses between junction block and strut.


SB 27-29 Dec 1968 2 O 27 Flap controls. To introduce Lockheed Mod5488 to flap servo drives, Part. A -AIR45566/4/7, Part. B - AIR45568/4/7.

Series 1, 1A, 1A-522, 1A/S-522, 1B, 1B-522,1B/S-522, 3, 3A and 3B (Pre Mod.255640)

SB 27-30 Nov 1970 3 R 27 Flap Servodynes. To introduce Lockheed modESA5463 to flap servodynes AIR45566/2/5 andAIR45568/2/5.

Series 1, 1A, 1A/S-522, 1B, 1B/S-522, 3A and 3B.

SB 27-31 May 1966 - I 27 Rudder Bias System. To introduce DunlopMod.M388 on rudder bias strut (Dunlop SB36-76).

Series 1 and 1B

SB 27-3150 Oct 1997 - O 27 Flight Controls - Airbrakes - To introduceairbrake selector lever baulk

Hawker 800XP

SB 27-3153 Jan 1998 - M 27 Flight Controls. Removal of rudder bias drainvalves and pipes.


SB 27-32 Nov 1970 2 I 27 To introduce Lockheed Mod.SA5417 to Airbrake jacks AIR45398 and AIR45399 FlapServodynes AIR45566 AIR45568 & SteeringServo AIR45396.


SB 27-3217 Nov 1999 - M 27 Flight controls - Captain's and Co-Pilot's rudderpedal adjuster assembly - Incorrect assemblyof retaining ring and retaining washer

All DH/BH/HS 125 Series 1A/1B, 3A/3B,400A/400B; with the following assemblies:25CF169AB - Adjuster Assembly, Rudder Pedal,Captains (Pre. Mod. 251924);25CF169AD -Adjuster Assembly, Rudder Pedal, Captains(Mod. 251924); 25CF170AB - Adjuster Assembly

SB 27-33 May 1966 - R 27 Elevator Trim Control Installation. Incorrectassy of cable guard in horizontal stabiliser frontpulley bracket assy.

Applicable to HS.125 aircraft, all Series.

SB 27-34 Oct 1969 2 M 27 Elevator Ailerons. Introducing an internal gustlock for elevator and aileron controls.


SB 27-35 May 1966 - R 27 Elevator trim tab servo mounting. To introduceclass 2 locking at chain guards in elevator autotrim servo installation.






SB 27-3554 Nov 2007 4 O 27 FLIGHT CONTROLS - Proline 21 Air BrakeBaulk For Canadian Certification

Hawker 800XP, Serials 258541, 258556, 258567and subsequent. Hawker 900XP, Serials HA-0001and subsequent. This Service Bulletin has beenrevised to add Hawker 900XP to effectivity.

SB 27-3589 Mar 2004 1 M 27 Flight Controls - Removal of corrosion fromairbrake jack valve body

DH.125 Series 1A; HS.125 Series 1B; DH.125Series 1A-522; HS.125 Series 1B-522; DH.125Series 1A/R-522; HS.125 Series 1B/R-522;DH.125 Series 1A/S-522;HS.125 Series1B/S-522; DH.125 Series 3A; HS.125 Series 3B;DH.125 Series 3A/R; HS.125 Series 3B/R; DH.

SB 27-36 Sep 1968 1 I 27 Rudder and Rudder trim. Elevator and Elevatortrim. To introduce improved sealing of controlcables through the pressure dome.

Series 1, 1A, 1A-522, 1A/S-522, 1A/R-522, 1B,1B-522, 1B/S-522, 1B/R-522, 3A, 3A/R, 3A/RA,3B, 3B/R and 3B/RA.

SB 27-3676 Jul 2004 - R 27 Flight Controls - Elevator Control QuadrantSupport Fitting Forward Bolt Inspection

HAWKER 800XP, Serials 258628 through258666.

SB 27-37 Jun 1966 - R 27 Introduction of Lockheed Mod.ESA 4058(Airbrake jacks, Lockheed SB 27-4).

Series 1, 1A and 1B

SB 27-38 Dec 1970 2 I 27 Flap Jacks. AIR45566 and AIR45568 Tointroduce Lockheed Mod.ESA4064 (SB 27-8).

Series 1, 1A, 1A-522, 1A/S-522, 1B, 1B-522,1B/S-522, 3A and 3B

SB 27-3805 Nov 2006 - O 27 Flight Controls - Flap Hydraulic SystemElectrical Wiring Modification

Mitsubishi Model MU-300, Serials A003SAthrough A091SA; Raytheon Aircraft Model 400Beechjet, Serials RJ-1 through RJ-65; RaytheonAircraft Model 400A Beechjet, Serials RK-1through RK-353; Raytheon Aircraft Model 400A(Hawker 400XP), Serials RK-354 throughRK-507.





SB 27-3827 Mar 2007 - R 27 Flight Controls - Flap Asymmetry DetectorInspection and Replacement

Model 400A (Including Hawker 400XP), SerialsRK-402, RK-407, RK-409 through RK-457,RK-459 through RK-466, RK-476, RK-483, andRK-497;Model 400A, Serials RK-1 throughRK-401, RK-403 through RK-406, RK-408,RK-458, RK-467through RK-475 and RK-477through RK-482 who have installed P/N45AS86805-017 flapasymmetry detector fromFebruary, 2005 to October, 2006 with serialnumbers listed in Table 1;Model 400, Serials RJ-1through RJ-65 who have installed P/N45AS86805-017 flap asymmetrydetector fromFebruary, 2005 to October, 2006 with serialnumbers listed in Table 1;Model MU-300, SerialsA003SA through A0091SA who have installedP/N 45AS86805-017 flapasymmetry detector fromFebruary, 2005 to October, 2006 with serialnumbers listed in Table 1.

SB 27-3840 Nov 2007 1 O 27 Flight Controls - Improved Grease for TrimJacks

This Service Bulletin has been revised to addHawker 900XP aircraft to the Effectivity. ThisService Bulletin applies to the following pre-Mod25G138 aircraft: DH.125 Series 1A; HS.125Series 1B; DH.125 Series 1A-522; HS.125 Series1B-522; DH.125 Series 1A/R-522; HS.125 Series1B/R-522; DH.125 Series 1A/S-522; HS.125Series 1B/S-522; DH.125 Series 3A; HS.125Series 3B; DH.125 Series 3A/R; HS.125 Series3B/R; DH.125 Series 3A/RA; HS.125 Series3B/RA; HS.125 Series 3B/RB; HS.125 Series3B/RC; HS.125 Series F3B; HS.125 SeriesF3B/RA; BH.125 Series 400A; DH.125 Series400A; HS.125 Series 400A; HS.125 Series 400B;HS.125 Series 400B/1; HS.125 Series 401B;HS.125 Series 403A(C); HS.125 Series 403B;HS.125 Series F400B; HS.125 Series F403B;BH.125 Series 600A; HS.125 Series 600A;HS.125 Series 600B; HS.125 Series 600B/1;HS.125 Series 600B/2; HS.125 Series 600B/3;HS.125 Series F600B; HS.125 Series 700A;HS.125 Series 700B; BAe.125 Series 800A;BAe.125 Series 800A (C-29A); BAe.125 Series800A (U-125); BAe.125 Series 800B; BAe.125Series 1000A; BAe.125 Series 1000B; Hawker800; Hawker 800 (U-125A); Hawker 1000;Hawker 800XP, Hawker 850XPand Hawker900XP.





SB 27-39 Nov 1970 1 I 27 To introduce Lockheed Mod.ESA5535 to flapjack AIR 45566.


SB 27-4 Nov 1964 - I 27 To introduce one piece elevator 'G' Weight inplace of two separate weights.

Series 1 1B

SB 27-40 Jul 1966 - O 27 Introduction of (Part. A) new airbrake hingebolt, and (Part. B) new bottom fairing intolift/dump control system.

Series 1, 1A and 1B

SB 27-41 Jul 1966 - R 27 Inspection of aileron shroud clearancs. Applicable to HS.125 aircraft, all Series.

SB 27-42 Jun 1970 1 I 27 General. To introduce Honeywell microswitches 1HS N66 & 1HS N64 in lieu of 1HS 1& 1HS N3 respectively in all control system.

Series 1, 1A, 1A-522, 1A/S-522, 1A/R-522, 1B,1B-522, 1B/S-522, 1B/R-522, 3A, 3A/R, 3A/RA,3B, 3B/R, 3B/RA, 400A and 400B

SB 27-43 Jun 1970 3 R 27 Airbrakes. To introduce improved clearancebetween airbrake jack body and airbrake hingefitting.


SB 27-44 Oct 1966 - O 27 Introduction of new aileron trim fairlead at LHshroud skin stiffener between ribs 4 and 5.


SB 27-45 Oct 1966 - R 27 Elevator and Elevator trim control systems. Tointroduce improved control column gaiter andgaiter mounting. Reshaped tighter gaiters toeliminate slack folds.


SB 27-46 Oct 1966 - R 27 Elevator trim circuit. To prevent cable guard atpulley bracket in horizontal stabiliser fromjamming trim circuit.


SB 27-47 Nov 1966 - R 27 To introduce ident labels on certain controls inthe cockpit.

Series 1A and 1B

SB 27-48 Jul 1967 - O 27 Elevator and elevator trim control systems. Tomodify elevator trim tab con-rod.


SB 27-49 Jun 1970 1 M 27 Flap control system. To introduce a selfretaining bolt at the flap centre hinge.

Series 1, 1A, 1B, 3, 3A and 3B (withoutmod.255640)

SB 27-5 Nov 1964 - I 27 To introduce one piece casting for trim jackbodies.

Series 1, 1A and 1B

SB 27-50 Sep 1970 2 R 27 Modification to aileron controls at 'A' lever. Series 1 1A 1A-522 1A/S-522 1B 1B-5221B/S-522 1B/R-522 3A 3A/R 3A/RA 3B 3B/RA400A 400B





SB 27-51 Oct 1982 2 O 27 Flight controls - Gust Locks - To introduce anew throttle lever baulk interconnected to thegust lock


SB 27-52 Jul 1967 - I 27 Flap control system. To modify flap torque tubedrive housings.

Series 3A/R, 3B/R and 1B/R-522

SB 27-54 Dec 1967 - I 27 Flap position indicator. To fit indicator PW202HSD BU20 in lieu of PW202 HSD BU19.

Series 3A/R, 3B/R and aircraft094.

SB 27-55 Nov 1968 - O 27 Flap synchroniser transmitter drive.Introduction of adjustable drive link in lieu offixed length link.

Series 3A/R

SB 27-57 Mar 1968 - R 27 Elevator 'G' weight assy. 'G' weight arm assytouching the panel.

Series 1 1A 1B 3A 3B

SB 27-58 Oct 1970 1 I 27 To introduce Hobson Mod.371 to flap controlunit 614 Mk4 (Hobson SB 27-274).

Series 1B/R-522, 3A/R, 3A/RA, 3B/RA, 400A and400B

SB 27-59 - 251953A Jun 1968 - R 27 Flap control system. Modification to springstruts at flap control and servodyne.

Part A- Series 1A, 1B, 3A and 3B.Part B- Series3A/R, 3B/R, 3A/RA and 3B/RA.

SB 27-59 - 251953B Jun 1968 - R 27 Flap control system. Modification to springstruts at flap control and servodyne.

Part A- Series 1A, 1B, 3A and 3B.Part B- Series3A/R, 3B/R, 3A/RA and 3B/RA.

SB 27-6 Nov 1964 - I 27 To introduce modified rudder quadrant cableguard.

Series 1, 1A and 1B

SB 27-60 Aug 1968 - R 27 Elevator and elevator trim control system. Tointroduce modified control column gaiters.


SB 27-61 Apr 1969 3 R 27 Flap control system. To increase effort of theflap input circuit.

Series 1B/R-522, 3A/R, 3A/RA and 3B/RA

SB 27-62 Oct 1970 1 I 27 To introduce Hobson Mod.HCA409 to flapcontrol unit 614 Mk1.

Series 1B/R-522 (25094), 3A/R, 3A/RA, 3B/RA,400A and 400B

SB 27-63 Oct 1970 1 I 27 To introduce Hobson Mod.HCA394 to flapcontrol unit 614 Mk1 (Hobson SB 27-303).

Series 1B/R-522 (25094), 3A/R, 3A/RA, 3B/RA,400A and 400B

SB 27-64 Dec 1968 - I 27 To introduce Hobson Mod.HCA377 to flapposition receiver 617 Mk1.

Series 1B/R-522, 3A, 3B, 3A/R, 3A/RA, 3B/RA,400A and 400B.

SB 27-65 Dec 1970 1 I 27 Landing gear and flight controls. To introducegreaser adaptors in lieu of inserts.






SB 27-66 Jan 1969 - R 27 Flap control system. Jamming between baulklever and latch.

Applicable to HS.125 Series aircraft, Series 3A/R,3A/RA, 3B/RA, 1B/R-522, 400A and 400B

SB 27-67 Apr 1969 1 R 27 To introduce waxed string in lieu of'MICROFLEX' clips for retention of greasecovers on flap torque shafting.

Series 1B/R-522 3A/R 3A/RA 3B/RA 400

SB 27-68 Feb 1969 - O 27 Flap controls system. To improve run of flapsynchroniser cables within space between LRtank front wall and U/C fairing.

Series 1B/R-522, 3A/R, 3A/RA and 400A- NA711only

SB 27-69 Jan 1972 1 O 27 Flap controls. To introduce HobsonMod.HCA431 to flap control unit 614 Mk1.

Series 3A/R, 3A/RA, 3B/RA, 400A and 400B

SB 27-7 Jan 1965 1 I 27 To introduce Lockheed flap servodyneAIR45568 in lieu of AIR45566.

Series 1 and 1B

SB 27-70 Dec 1970 - O 27 Flap screw jacks. The existing ice chippersthread seals and wipers are replaced by newredesigned items.

Model DH.125, Series 3A/R and 3A/RA. ModelHS.125, Series 1B/R-522 and 3B/RA

SB 27-71 May 1969 - I 27 Flaps. To introduce screw and nut assyCHA614-281 in lieu of and by conversion ofCHA614-258 Hobson Mod.HCA451.

Series 3A/R, 3A/RA, 3B/RA, 1B/R (522), 400Aand 400B

SB 27-72 Sep 1969 1 I 27 To introduce Dunlop Mod.M643 to rudder biasstrut AC60188.

Series 1, 1A, 1A-522, 1A/S-522, 1B-522,1B/S-522, 1B/R-522, 3A, 3A/R, 3A/RA, 3B,3B/RA, 400A and 400B

SB 27-73 Jun 1969 - I 27 Flaps. To introduce Hobson Mod.HCA469 toflap control unit 614 Mk1.


SB 27-74 Jun 1970 1 I 27 Aileron, Rudder & Elevator. To improve thecontrol surface balancing. Alternative brasscompensator balance weight on rudder.

Series 1, 1A, 1A-522, 1A/R-522, 1A/S-522, 1B,1B-522, 1B/R-522, 1B/S-522, 3A, 3A/R, 3A/RA,3B, 3B/R, 3B/RA, 400A and 400B

SB 27-75 Jul 1969 - R 27 Elevator control cable. Interference betweenelevator cable turnbarrel and bracket securingstatic pipes at Frame 6.

Applicable to HS.125 aircraft

SB 27-79 Nov 1984 4 O 27 Flight controls - Flap synchronizing - To modifyflap symmetry cable circuit LH


SB 27-79 - INSP Aug 1969 - R 27 Flap synchroniser cables. LH inner cables (PreMod.251903) frayed.






SB 27-80 Jun 1975 1 I 27 Flap control unit. Introducing HobsonMod.HCA434A.

Model DH.125, Series 3A/R, 3A/RA and 400A.Model HS.125, Series 1B/R-522, 3B/RA and400B

SB 27-81 Oct 1969 - R 27 Flap synchroniser cables (L/Range aircraft).RH inner cable chafing against airbrakehydraulic pipe.

Applicable to HS.125 aircraft Series 1B/R-522,3A/R, 3A/RA, 3B/RA, 400A and 400B

SB 27-82 Aug 1970 - O 27 Flap control unit. Introducing 'O' ring seal onresetter screw.

Series 1B/R (A/C 25094) 3A/R 3A/RA 3B/RA 400

SB 27-83 Mar 1970 - R 27 To introduce improved method of locking TopAirbrake stop bolt.

Model DH.125, Series 1A, 1A-522, 1A/S-522, 3A,3A/R, 3A/RA and 400A. Model HS.125, Seris 1,1B-522, 1B/R-522, 1B/S-522, 3B, 3B/RA and400B

SB 27-84 Feb 1970 - R 27 Pilots control column mounting installation.Incorrect protective treatment of a batch ofmounting castings.


SB 27-86 Mar 1972 4 M 27 Addition of Airbrake Servodyne spring pots andsplit-pinned slotted stiffnuts.

Model DH.125, Series 1A, 1A-522, 1A/S-522, 3A,3A/R, 3A/RA and 400A. Model HS.125, Series 1,1-521, 1B, 1B-522, 1B/R-522, 1B/S-522, 3B,3B/RA and 400B.

SB 27-87 Nov 1971 - R 27 Rudder bias strut AC64166 introduced in lieuand by conversion of strut AC60188 DunlopMod.M989 SB 39-196.


SB 27-88 Mar 1971 - I 27 Replacement of airbrake position indicatormicroswitch 1HS-N64 by 1HY-51.

Model DH.125, Series 1A, 1A-522, 1A/S-522, 3A,3A/R, 3A/RA and 400A. Model BH.125, Series400A. Model HS.125, Series 1, 1-521, 1B,1B-522, 1B/R-522, 1B/S-522, 3B, 3B/RA, 400Band 600B.

SB 27-89 Dec 1970 - R 27 Captain and co-pilots rudder pedal adjusterassembly. Incorrect assy of retaining ring andretaining washer.


SB 27-9 Dec 1964 2 R 27 Control column gaiter assy possible loose fit. This Bulletin is applicable to the HS.125 Series 1,1A, 1B and 2

SB 27-90 Jul 1972 1 O 27 Flap synchroniser circuit. Covers added overcables in wing shroud transmitter and pulleysand cable separator angle increased in depthand length.

Model DH.125, Series 3A/R, 3A/RA and 400A.Model BH.125, Series 400A. Model HS.125,Series 1B/R-522, 3B/RA and 400B





SB 27-91 Mar 1971 - I 27 Flap screwjack. Screw shaft and nut assyCHA614-296 replace CHA614-281 Chormeplate in lieu of silver on screwshaft nut bodyand liners.

Model DH.125, Series 3A/R, 3A/RA and 400A.Model BH.125, Series 400A. Model HS.125,Series 1B/R-522, 3B/RA, 400B and 600B

SB 27-92 Jan 1971 - R 27 Possible fracture of connecting rod attachmentlugs of aileron, rudder, and elevator trim andgeared tabs.


SB 27-93 Mar 1971 - R 27 Check of adequate thread engagement ofslotted stiffnuts. (Mod.252174) in airbrakecontrol system adjustable LH and RH links.

Applicable to HS.125 and DH.125 aircraft, Series1A, 1A-522, 1A-(522), 1A/S-522, 1A/R-522, 1B,1B-522, 1B-(522), 1A/R-522, 1B/S-522, 3, 3A, 3B,3A/R, 3B/R, 3A/RA, 3B/RA, 400A and 400B withMod. 25/2174

SB 27-95 Jun 1971 - R 27 Identification of slotted stiffnuts in LH airbrakecontrol system adjustable link assy and cable-end attachment.

Applicable to HS/BH.125 aircraft, witht Series3B/RA, 400A and 400B

SB 27-96 Apr 1972 - O 27 Flap control unit 164 Mk1-Control unit reset byshimming stop bolt to increase flap loweringtimes and resident Mk2 Hobson Mod HCA539.

Model DH.125, Series 3A/R, 3A/RA and 400A.Model BH.125, Series 400A. Model HS.125,Series 1B/R-522, 3B/RA and 400B.

SB 27-97 Aug 1971 - R 27 Rudder trim and geared tabs. Inspect forcracking of hinge brackets and links.

Applicable to HS/DH 125 aircraft, Series 1, 1A,1A-522, 1A/S-522, 1B, 1B-522, 1B/S-522 and 3B

SB 27-99 Apr 1972 - R 27 Rudder bias system air supply. Possible foulingbetween water drain traps and structure.

Applicable to DH/HS/BH.125 aircraft Series 1, 1A,1B, 3A, 3B and all variants, 400A and 400B

SB 27-A140 Mar 1986 - M 27 Flight controls - Flap system - Inspection oftorque shaft assemblies

Applicable to Series DH/HS 125 aircraft, Series 1,1A, 1B, 3A, 3B fitted with Viper or TFE 731engines

SB 27-A158 Oct 1992 - R 27 Flight Controls- Inspection of rudder bias drainpipes for cracking due to freezing moisture

Applicable to all BAe 125 Series 1000A and1000B

SB 27-A3 Dec 1964 1 R 27 Locking device. Only to be used when aircraftis parked.

All Hawker Siddeley 125 Series 1, 1A, 1B ALERTBULLETIN 27-A3

SB 27-A49 Jun 1967 - M 27 Flap operating Mechanism. Omission ofsplit-pin from flap centre hinge bolt.

Applicable to HS.125, aircraft, all Series

SB 27-A98 Jan 1972 - M 27 Flap syncrhronizer cable slush guards. Mudand water accumulation freezing andpreventing flap operation.

Applicable to HS/DH/BH 125 aircraft withMod.25/2455 or 125 S.B. 27-90 (2155) embodied.Model HS 125, Series 1B/R-522, 3B/RA and400B. Model DH.125, Series 3A/R, 3A/RA and400A. Model BH.125, Series 400A.





ATA Chapter 28Fuel

SB 28-1 Nov 1964 - O 28 To ease replacement of fuel filler caps. Series 1

SB 28-10 Dec 1970 1 O 28 Introducing Thompson products Mod.03 toBooster pump TB258800-1.

Series 1, 1A, 1A-522, 1B and 1B-522

SB 28-11 Dec 1970 2 I 28 Introducing Plessey Mod.P485 to de-icingpump Plessey Pt. No. DP022/1.

Series 1, 1A, 1A-522, 1B, 1B-522 and 3B

SB 28-12 Jun 1966 - O 28 Storage. Filler cap type AWE192-4 to introduceHSD Mod.28003. (HSD SB28-1).


SB 28-13 Jun 1966 - R 28 To introduce a water transfer system in wingtanks to transfer any residue water to thecollector tank.


SB 28-15 Sep 1966 1 R 28 Fuels - Feed system - Temporary procedure todetect damaged seals

Applicable to all H.S. 125 aircraft excepting25080, 25089, 25090, 25092, 25094, 25097,25099 and 25104 and subsequent until theinspection/rectification work has been completed.

SB 28-16 Jun 1971 2 I 28 Fuel contents indicating. Introduction of SmithsMod.09 to amplifier FAB 28.

Series 1A, 1A, 1A-522, 1A/S-522, 1B, 1B-522,1B/S-522, 1B/R-522, 3A, 3B, 3A/R, 3A/RA and3B/RA.

SB 28-17 Oct 1966 - R 28 Indicating / ground servicing. Introducing diptube calibrated to record fuel contents in USgallons.

Series 1A

SB 28-18 Apr 1967 - R 28 Fuel filter de-icing system and windshield fluidde-icing. Corrosion.

applicable to H.S.125 aircraft, all Series

SB 28-2 Feb 1965 - R 28 Replacement of fuel ampifier valves. Applicable to H.S. 125 Series 1, 1A and 1Baircraft fitted with Fuel Quantity Amplifier CodeFAB 28

SB 28-21 May 1968 1 R 28 Fuel feed system. To introduce revised fuelpipe installation in the region of fuselage frame20A to A/C pre Mod.251700 & 255640.

Series 1, 1A, 1B, 3A and 3B

SB 28-22 Nov 1970 1 I 28 Fuel contents indicating. To introduce Smithsfuel contents gauge cable box BT. 27-3 in lieuof BT. 27-2.

Series 1, 1A, 1B, 3A, 3B, 1A-522, 1A/S-522,1B-522, 1B/S-522, 1B/R-522, 3A/R, 3A/RA,3B/RA, 400A and 400B.





SB 28-23 Jan 1973 2 M 28 Introduction of fuel filter NRV AWE124-25A inlieu of AWE124-25.

Series 1, 1A, 1A-522, 1A/S-522, 1B, 1B-522,1B/S-522, 1B/R-522, 3A, 3B, 3A/R, 3A/RA,3B/RA, 400A and 400B.

SB 28-25 Jul 1968 2 R 28 De-icing system. Fuel filter pump relief valveaffected by corrosion.

Applicable to H.S. 125 aircraft, all Series, Pre.Mod.257150 and Pre.Mod.251840

SB 28-26 Nov 1967 - R 28 Fuel contents indicating. To reposition fuelcontents trimmer boxes so that externalconnections do not face downwards.

Series 1A and 1B

SB 28-27 Oct 1968 1 O 28 Fuel feed system. To introduce Intertechniquebooster pump Pt. No. 2070COI in lieu ofThompson pump Pt. No. TB258800.

Aircraft 25121, 25122 and 25127

SB 28-28 Nov 1970 1 O 28 Storage. To introduce HSD Mod.28151 to fuelfilter cap AWE192/4A.

Series 1, 1A, 1A-522, 1A/S-522, 1B, 1B-522,1B/R-522, 1B/S-522, 3A, 3B, 3A/R, 3B/RA, 400Aand 400B

SB 28-29 Apr 1973 2 R 28 Fuel filter de-icing and windshield fluid de-icingsystems. To introduce revised materials.

Series 1, 1A, 1A/S-522, 1B, 1B/R-522, 3, 3A, 3B,3A/R, 3A/RA, 3B, 3B/RA, 400A and 400B

SB 28-3 Dec 1970 1 O 28 To introduce Smiths Mod.08 on fuel contentsamplifier FAB28.


SB 28-30 Nov 1967 - O 28 Fuel feed system. To Modify fuel cock controlsunder fuselage centre section.

Series 1, 1A, 1B, 3, 3A, 3B, 3A/R and 3B/R

SB 28-3031 Dec 1997 - O 28 Fuel - Introduction of a damping restrictor at theengine fuel low pressure warning switch

BAe 125 Series 800A and 800B (including MajorVariants C29A and U125), Hawker 800 (includingMajor Variant U125A) and Hawker 800XP

SB 28-31 Nov 1970 1 I 28 Fuel contents indicating. To introduce Smithsfuel gauging co-axial cable assemblies.

Series 1, 1A, 1A-522, 1A/S-522, 1B, 1B-522, 3A,3B, 3A/R, 3A/RA and 3B/RA

SB 28-32 Oct 1970 1 I 28 To introduce Smiths Mod.10 to fuel contentsamplifier.FAB28.


SB 28-33 Jun 1968 - R 28 Fuel storage and distribution. Incorrectassembly of AVIMO couplings in the wingcentre section.

applicable to H.S.125 aircraft, Series 3A/R

SB 28-34 Oct 1970 1 R 28 To introduce Plessey Mod.P831C to fuel filterde-icing pump DP022/5.






SB 28-35 Mar 1971 1 I 28 Fuel feed system.To introduce Intertechniquebooster pump Pt No. 2070 C01 in lieu ofThompson type booster pump Pt No. TB258800.

Series 1, 1A, 1B, 1A/R, 1B/R, 1A/S-522,1B/S-522, 3A, 3B, 3A/R, 3B/R, 3A/RA and 3B/RApost mod.251120

SB 28-36 May 1970 2 R 28 Fuel feed system. Rear equipment bay pipecorrosion.

Applicable to H.S.125 aircraft, all Series.

SB 28-37 Jan 1969 - I 28 Fuel filter de-icing system. To introduce baggedstrontium chromate tablets in lieu of loosetablets in the methanol tank filter.

Series 1, 1A, 1A-522, 1A/S-522, 1B, 1B-522,1B/S-522, 1B/R-522, 3A, 3A/R, 3A/RA, 400A and400B, Mod.251840

SB 28-38 Feb 1969 - I 28 To introduce HSD Mod.28513 to Non-returnvalves -124-14.

Series 1, 1A, 1A-522, 1A/S-522, 1B, 1B-522,1B/S-522, 1B/R-522, 3A, 3B, 3A/R, 3A/RA, 400Aand 400B

SB 28-39 Feb 1969 - I 28 To introduce Thompson RW fuel pump25880-5 in lieu of 25880-3.


SB 28-4 Apr 1965 - I 28 To reduce the amount of unusable fuel and tosimplify pump installation.


SB 28-40 Dec 1969 1 R 28 Power plant. General. To introduce Nose clipstype SP91 in lieu of Minox quick release clips.

Applicable to HS.125 aircaft, all Series,incorporating Mod.25/1767, Part B.

SB 28-40 - INSP Mar 1969 1 R 28 Feed pipe installation. Minox quick releaseclips. Substitution by clips of another type.

Applicable to HS.125 aircaft, all Series,incorporating Mod.25/1767, Part B.

SB 28-41 Apr 1969 1 R 28 Fuel feed system. Rear equipment bay pipesfouling against structure

Applicable to HS.125 aircraft, Series 1B/R-522,3A/R, 3A/RA and 3B/RA.

SB 28-42 Apr 1969 - I 28 To introduce fuel label quoting long range tankcapacity in imperial gallons.

Series 3A/R, 3A/RA, 1B/R-522, 3B/RA, 400A and400B

SB 28-43 Apr 1969 - I 28 Contents indicating system. To introduce wingtank fuel dip tubes AWE1151.

Series 1A, 3A, 3A/R, 3A/RA and 400A

SB 28-44 Jun 1969 - I 28 Elliott fuel flowmeter system. To introduceElliott Mod.73-55 to engine fuel flowmeterintegrator unit EF 84444/45.

Series 3B and 3B/RA (A/C 25164, 25165, 25166,25167 and 25168).

SB 28-45 Sep 1969 1 R 28 Introducing NRV. 9840000/J in lieu ofHSD124-34A. (flight refuelling) in fuel feed linesfrom long range tank.

Series 1B/R-522, 3A/R, 3A/RA, 3B/RA, 400A and400B.





SB 28-46 Nov 1969 - I 28 To introduce HSD filler cap AWE 192-4B in lieuof AWE 192-4A. (HSD Mod.28678).

Model DH.125, Series 1A, 1A-522, 1A/S-522, 3A,3AR, 3ARA and 400A. Model HS.125, Series 1,1B, 1B-522, 1B/R-522, 1B/S-522, 3B, 3BRA and400B.

SB 28-47 Nov 1969 - O 28 To remove fuel low pressure switch vent pipe. Model HS.125, Series 1, 1B, 1B-522, 1B/R-522,1B/S-522, 3B, 3BRA and 400B. Model DH.125,Series 1A, 1A-522, 1A/S-522, 3A, 3AR, 3ARAand 400A.

SB 28-48 Dec 1978 3 R 28 To improve resistance to corrosion in fuel filterde-icing system.

Model DH.125, Series 1A, 1A-522, 1A/S-522, 3A,3AR, 3ARA and 400A. Model HS.125, Series 1,1B, 1B-522, 1B/S-522, 3B, 400B and 3B/RA.

SB 28-49 Aug 1970 - O 28 De-icing pumps 550/1/21735. Type DP022/5and DP022/6. Pt. A.New end cover treated withICI resistant finish. Pt. B.New pump body.

Model DH.125, Series 1A, 1A-522, 1A/S-522, 3A,3AR, 3ARA and 400A. Model HS.125, Series 1,1-521, 1B, 1B-522, 1B/R-522, 1B/S-522, 3B,3BRA and 400B.

SB 28-49 - INSP Jun 1971 1 R 28 Fuel filter de-icing system. Excessive pressure,instances have occurred of failure of the Diff.pressure switch in fuel system.

Model DH.125, Series 1A, 1A-522, 1A/S-522, 3A,3AR, 3ARA and 400A. Model HS.125, Series 1,1-521, 1B, 1B-522, 1B/R-522, 1B/S-522, 3B,3BRA and 400B.

SB 28-5 Apr 1965 - I 28 To introduce revised pipe run between frame20A and rear spar.


SB 28-50 May 1975 6 R 28 Tanks. To introduce strontium chromatecapsules in wing tanks to reduce the possibilityof corrosion due to Microbiological action.

Model DH.125, Series 1A, 1A-522, 1A/S-522, 3A,3ARA and 400A. Model BH.125, Series 400A and600A. Model HS.125, Series 1, 1-521, 1B,1B-522, 1B/R-522, 1B/S-522, 3B, 3BRA, 3BRC,400B, 401B, 403B and 600B.

SB 28-51 May 1971 - I 28 Long range tank. To adopt series 600 tank forearlier series of long range aircraft.

Model DH.125, Series 3A/R, 3A/RA and 400A.Model BH.125, Series 400A. 1B/R-522, 3B/RAand 400B.

SB 28-52 Nov 1971 - O 28 Non return valve AWE124-14A andHSD124-34A. Improved torsion springintroduced. (HSD Mod.28699 SB 28-7).


SB 28-53 Nov 1970 - O 28 Long range tank vent pipe. revised clipping,Existing sadle clip has been replaced by a 'P'clip at station 3953.

Series 1B/R-522 3A/R 3A/RA 3B/RA 400





SB 28-55 Mar 1976 - R 28 Methanol shut-off cocks. Electrically operatedcocks are added between the Methanol pumpand the fuel system.

Series 1B/S-522 400B 600A 600B (up to A/C256045)

SB 28-55 - INSP Apr 1972 - R 28 Fuel filter de-icing system. Contamination ofmethanol by ingress of fuel.

Series 1B/S-522 400B 600A 600B (up to A/C256045)

SB 28-56 Dec 1972 - M 28 Fuel filter de-icing system. Contamination ofmethanol by ingress of fuel. Pre- flight andWeekly checks are required on the system.

Applicable to HS/DH/BH 125 aircraft Series 1 and1A, 1B, 3B, 3A and variants, 400A and 400B, preMod.25/1840 part F and 25/7247.

SB 28-57 Mar 1976 2 O 28 Fuel - Filter de-icing system - To changeremaining pipes couplings, bleed adaptor andjunction block from light alloy to stainless steel

Model DH.125, Series 1A, 1A-522, 1A/S-522, 3A,3A/R, 3A/RA and 400A. Model HS.125, 1, 1-521,1B, 1B-522, 1B/R-522, 1B/S-522, 3B, 3B/RA and400B.

SB 28-60 May 1981 2 M 28 Fuel – Storage – To introduce rubber flap valvebeneath each wing filler cap

Model DH/HS/BH.125, Series 1, 3, 400, 401, 403,600 and all variants.

SB 28-64 Apr 1977 - R 28 Distribution. Inadequate locking of fuel transfervalve connecting rod.

Applicable to HS/DH/BH 125 aircraft, all serieswithout mod.252590 embodied.

SB 28-65 Sep 1978 2 R 28 Pressure refuel / defuel system. To introducean improved pressure refuel Master cockassembly.

Series 700 and all variants Mod.252545

SB 28-67 Dec 1978 1 M 28 Pressure refuel / defuel system. Failure of HTE'v' clamps.

Series 700

SB 28-68 Apr 1979 1 O 28 Contents indicating system. To introduceSmiths partial type 7 contents equipment in lieuof Smiths Waymouth system.

Model DH/HS.125, Series 1, 3 and all variants.Model HS/BH.125, Series 400, 401, 403, 600 anall variants. Model HS.125, Series 700 and allvariants.

SB 28-69 Jun 1979 1 M 28 Distribution. possible foul between fuel pipeand flap input lever.

Applicable to all HS/DH/BH aircraft of Series1B/R-522, 3A/R, 3A/RA, 3B/RA, 3B/RC, 400A,403A(C) 400B, 403B, 600A, 600B, 3A/RA,F-3B/R, F-400B and F-600B.

SB 28-70 Nov 1986 3 R 28 Fuel indicating - Coaxial cable MCK-B-45replaces MCK-47 in the contents indicatingsystem


SB 28-71 May 1980 - R 28 Refuel valve position indicator relays.Suppression Diode added across coils.


SB 28-72 Aug 1980 - R 28 Rigid pipelines. Possible foul between flap jackYoke and fuel pipe.

Apllicable to HS/DH 125 aircraft Series 1 and 3 allvariants pre-mod. 255640.





SB 28-73 Dec 1980 - I 28 Fuel system - Fitment of current productionL.P. fuel cock castings to aircraft withoutpressure refuelling

Model DH/HS.125, Series 1, 3 and all variants.Model HS/BH.125, Seris 400, 401, 403, 600 andall variants. Model HS/BAe.125, Series 700 andall variants.

SB 28-75 Nov 1981 - R 28 Storage. To introduce flap valve stop Bracket ateach overwing filler point.

Model HS/BAe.125, Series 700A and 700B

SB 28-76 Oct 1985 1 O 28 To relocate the front spar fuel contents gaugingconnector MB54 to improve accessibility.

Model HS/BAe.125, Series 700 and all variants.

SB 28-77 Feb 1984 1 O 28 Fuel - Contents indicating system - Additionalinterface seal at cable connections

Model HS/BAe.125, Series 700 and variants.Model DH/HS/BH/BAe.125, Series 1, 3, 400, 600and 700.

SB 28-78 Feb 1983 1 O 28 Contents indicating system. Improvements tobridge amplifier unit 0201 KAM-3.

Model BAe.125, Series 700.

SB 28-79 Jul 1983 1 R 28 Contents indicating system. Improved bondingof amplifiers and cable boxes. To minimiseradio interference effects on fuel indiction.

Model BAe.125, Series 700- Post Mod.252572

SB 28-8 Nov 1970 1 R 28 Flow transmitter. To introduce fuel flowtransmitter EF81112/09 in lieu of EF81112/08.

Series 3B (25/015, 25/062 and 25/069)

SB 28-80 Apr 1985 - R 28 Fuel - Improved fuel resistant bulkheadconnectors

Model BAe.125, Series 800A and 800B

SB 28-81 Jan 1986 - R 28 Fuel - Fuselage - Wings - Removal of strontiumchromate capsules

All Series- Models HS/DH/BH/BAe.125 aircraft.

SB 28-82 Jul 1987 2 O 28 Contents indicating system.Amplifiers/cableboxes to Smiths AMI No. B1499 issue 3. Toprovide improved reliability.


SB 28-83 Dec 1987 - O 28 Fuel - Distribution - Introduce a one piecerefuel pipe at the master refuel valve in place ofexisting cast adapter and stub pipes

Series 700A and 700B (with BAe Mod.252545).Series 800A and 800B (258001 to 258078inclusive, 258080, 258081, 258082, 258083 and258084.

SB 28-84 Dec 1987 - O 28 Fuel - Distribution - Pipe claming arrangementrevised

Applicable to Series DH/BH/HS/BAe 125 aircraft.

SB 28-85 May 1988 1 I 28 Fuel - General - Introduction of a revisedventral fuel tank for aircraft post-mod.259499A

Model BAe Series 800 aircraftPost-Mod.259499A.

SB 28-86 Jun 1991 - M 28 Fuel - Inspection of fuel feed pipe joints formisalignment at pipe entry into coupling

Applicable to Series F600A, F600B, 700A, 700B,800A and 800B pre-mod.253180D





SB 28-87 Dec 1991 - M 28 Fuel - Inspection of fuel feed pipe joints formisalighment at pipe entry into coupling

All Series up to and including 600 (excludingF600)

SB 28-88 Aug 1992 - I 28 Fuel - Booster pump - Introduction of airbornepump Pt. No. 2C40-2


SB 28-89 Feb 1993 - R 28 Fuel system - Chafing of LH low pressure fuelpipe by flap jack hydraulic union

Series 1 1A 1B 3A 3B (Pre long range)

SB 28-9 Nov 1970 1 O 28 De-icing pump. Introduction of Plessey pumptype DP022/6 in lieu of DP022/4.

Series 1, 1A, 1A-522, 1A/S-522, 1B, 1B-522,1B/S-522 and 1B/R-522.

SB 28-90 Jan 1993 - O 28 Fuel - Front ventral tank - Introduction of a 150second time delay in the fuel transfer valvecircuit.

Series 1000A and 1000B - Pre Mod.253374B

SB 28-91 Mar 1997 - O 28 Distribution. Introduction of revised restrictorsto reduce ventral tank refuel times.


SB 28-92 May 1995 - R 28 To prevent fuel entering the dry area outboardof the vent surge tank via the cable conduit.

HS.125, Series 700A and 700B.

SB 28-93 Feb 1995 - I 28 Restricted - See Remarks Hawker 800 U-125A (258245, 258247)

SB 28-94 Nov 2000 1 O 28 Refuel panel DT- Introduction of revisedcircuitry latching the forward ventral tank valveclosed when the tank is full.

Part A:BAe 125 Series 1000A, 1000B andHawker 1000 Pre Mod. 253352A.Part B:BAe 125Series 1000A, 1000B and Hawker 1000 PostMod. 253352A.

SB 28-A23 Jul 1968 2 M 28 Fuel filter de-icing system. Non return valve(AWE). Failure of plate valve facing.


SB 28-A63 Mar 1977 - M 28 Filter de-icing system. Possibility of overhauledpumps supplied by HSD Hatfield unit prior to18/2/77 not operating in low temperatures.

Applicable to HS.125 aircraft fitted with fuel filterde-icing pumps supplied under H.S.A. HatfieldUnit Exchange scheme, which have been in usefor less than 6 months or 100 flying hours,whichever occurs sooner.

SB 28-A65 Jan 1978 1 M 28 Pressure refuel / defuel system. Failure of lugson master refuel valve tee piece.

Applicable to HS.125 Series 700 aircraft

SB 28-A66 Oct 1978 - R 28 Pressure refuel / defuel system. Failure of HTE'V' clamps.

Series 700





ATA Chapter 29Hydraulic Power

SB 29-1 Jan 1965 2 R 29 To ensure that pressure transmitter indicatesnormal accumulator pressure at all times.

Series 1, 1A and 1B

SB 29-10 Jul 1965 - R 29 To increase gauge of HP hydraulic pipesbetween engine driven pump and fillet.

Series 1, 1A and 1B

SB 29-101 Apr 1997 3 R 29 Hydraulic Power - Introduction of a bypass witha flow restrictor in the air brake hydraulicsystem

Hawker 800 XP (258266, 258277 to 258287,258289 to 258304, 258307 to 258324, 258327 to258330, 258332, 258335 and 258337 inclusive.

SB 29-12 Dec 1965 - R 29 Main and Auxiliary system. To introduce nylonreinforced hose and revised clipping athydraulic reservoir sight tube.


SB 29-13 Jun 1966 - O 29 Introduces packings to auxiliary tank mountingplates.

Series 1, 1A, 1B, without Mod.251398

SB 29-13 - INSP Nov 1965 - R 29 Possible fouling of auxiliary system tankinstallation bolts with tank walls.

Series 1, 1A, 1B, without Mod.251398

SB 29-14 Jan 1966 - R 29 Main System. To introduce new pipe inhydraulic box between frames 21 and 22.


SB 29-16 May 1968 2 R 29 Main system. To change light alloy hydraulicpipes to stainless steel.


SB 29-17 May 1966 - R 29 Main system. Failure of high pressure hoseassembly from hydraulic pump.

Applicable to HS.125 aircraft all Series.

SB 29-18 Jun 1966 - O 29 Indicating. Introducing Sangamo WestonMod.H to pressure transmitter S122.

Series 1, 1A and 1B

SB 29-19 Jul 1966 - O 29 U/C emergency lever socket. To introducecover label and wire locking.

Series 1, 1A, 1B, 3A and 3B, without Mod.255501

SB 29-2 Mar 1965 2 M 29 Auxiliary power. To introduce modified handpump tank.

Series 1, 1A and 1B

SB 29-20 Nov 1970 1 I 29 Main system. Accumulators AIR45440. Tointroduce Lockheed Mod.5564.

Series 1, 1A, 1A-522, 1A/S-522, 1B, 1B-522,1B/R-522, 1B/S-522, 3A, 3B, 3A/R, 3A/RA and3B/RA





SB 29-21 Nov 1970 1 O 29 Main System. Accumulators AIR45440. Tointroduce Lockheed Mod.5569.


SB 29-22 Oct 1966 - O 29 Landing Gear. To introduce 5/32 inch boreDunlop hoses with revised type endconnections.


SB 29-23 Oct 1966 - O 29 Main System. To introduce 'REED SWITCH'type hydraulic tank contents transmitter.

Series 3

SB 29-24 Dec 1966 - O 29 Junction block at nose gear hoses. Tointroduce new junction block with positionedtapping for emergency press pipe.

Series 1A, 1B (25080 to 25108)

SB 29-25 Oct 1966 - R 29 Main system reservoir assembly. Levelindicator tube impaired by overheating.

Applicable to HS.125 125 aircraft, all Series.

SB 29-26 Jun 1967 1 R 29 Main system. To replace Dunlop hose 25EK335 with Palmer Fluoflex FD200-6 hose.


SB 29-28 Mar 1967 - R 29 To revise fuse designation label in DA-AD foremergency hydraulic system.

Series 3 (25062 and 25069)

SB 29-29 Dec 1966 - I 29 Main system. Installation of NRV AIR48026 inlieu of AIR45420 on front pressure bulkhead innose gear bay and in hydraulic box.

Series 1, 1A, 1B, 3, 3A, 3B, 400A and 400B

SB 29-30 Jan 1967 - R 29 Wheels and brakes. Deletion of metal clampblock on main undercarriage leg.


SB 29-3027 Jan 1998 - R 29 Introduction of revised filtration system inhydraulic module.


SB 29-31 Jul 1974 3 I 29 Main system (Servicing). To introduce groundtest connection to hydraulic system in enginepod.

Series 1A, 1A-522, 1A/S-522, 1B, 1B-522,1B/S-522, 1B/R-522, 3A, 3A/R, 3A/RA, 3B,3B/RA, 400A, 400B, 600A and 600B

SB 29-32 May 1968 1 O 29 Main system. Add micronic filtration in pressureline to hydraulic system.

Series 1, 1A, 1B, 3, 3A, 3B and 3A/R

SB 29-3225 May 2002 - O 29 Hydraulic Power- Introduction of manuallyOperated Pressure Release Valves

Hawker 800 XP Aircraft Pre Mod. 25F774A

SB 29-3287 Aug 2000 - O 29 Restricted - See Remarks Hawker 800 (U-125A) JASDF airplanes, SerialNumbers 258245, 258247, 258250, 258268,258288 and 258305.





SB 29-33 Nov 1967 - O 29 Main system. Hydraulic hose connector onfillet/engine.

Series 1, 1A, 1B, 3, 3A, 3A/R, 3B and 3B/R

SB 29-34 Nov 1970 1 O 29 Main system. To introduce Saunders Mod.75 to'ON - OFF' valve 105 BR 09.

Series 1 1A 1A-522 1A/S-522 1B 1B-5221B/S-522 1B/R-522 3A 3A/RA 3B 3B/RA 400A400B

SB 29-3440 Dec 2001 - O 29 Hydraulic Power - Introduction of a CombinedRestrictor and Pressure Relief Valve in EachWing Airbrake Hydraulic Circuit

BAe.125 Series 800A, Post Mod. 259283C andPre Mod. 25F624A; BAe.125 Series 800B, PostMod. 259283C and Pre Mod. 25F624A; Hawker800, Post Mod. 259283C and Pre Mod. 25F624A;Hawker 800XP, Post Mod. 259283C and PreMod. 25F624A; Hawker 800 (U-125A), Pre Mod.25E274A.

SB 29-3441 Sep 2001 - M 29 Introduction of a combined restrictor/pressurerelief valve in the airbrake bypass system

Hawker 800XP, Post Mod. 25F624A or with SB29-101 accomplished.

SB 29-35 Jun 1970 1 R 29 Hoses in landing gear flaps and airbrakesystems. Failure through corrosion of metalbraid.

Applicable to HS.125 aircraft, all Series.

SB 29-36 Nov 1970 1 I 29 To introduce Sangamo Weston Mod.R topressure transmitters Pt. No.S122/6/63.


SB 29-37 Jun 1968 - R 29 Main system. To introduce Saunders valve105BR02/A in lieu of BR 02/1 (Saunders SB28-10-82).

Series 1 (25003)

SB 29-3759 Dec 2005 - M 29 Hydraulic Power - Inspection of Hydraulic Linesfor Possible Chafing

All BAe.125 Series 1000A, BAe.125 Series 1000Band Hawker 1000.

SB 29-4 Feb 1965 - M 29 Introduction of additional items for hydraulicemergency system.

Series 1, 1A and 1B

SB 29-40 Aug 1969 - I 29 To introduce Lockheed Mod.SA5801 to enginedriven hydraulic pump AIR111500.

Series 1, 1A, 1A-522, 1A/S-522, 1B, 1B-522,1B/S-522, 3A, 3B, 3A/R, 3A/RA, 400A and 400B

SB 29-41 Aug 1969 - I 29 To introduce Lockheed Mod.SA5467 to enginedriven hydraulic pump AIR111500.

Series 1, 1A, 1A-522, 1A/S-522, 1B, 1B-522,1B/S-522, 3A, 3B, 3A/R, 3A/RA, 3B/RA, 400Aand 400B

SB 29-42 Aug 1969 - O 29 To introduce stronger mounting brackets onemergency hydraulic tank.

Series 1B/R-522, 3A, 3B, 3A/R, 3A/RA, 3B/RA,400A and 400B (Post Mod.251398)





SB 29-43 May 1970 - I 29 Engine driven pump. To introduce LockheedMod.5645.

Model DH.125, Series 1A, 1A-522, 1A/S-522, 3A,3AR, 3ARA and 400A. Model HS.125, Series 1,1B, 1B-522, 1B/R-522, 1B/S-522, 3B, 3BRA and400B

SB 29-44 Aug 1970 - O 29 To introduce light alloy clamp blocks in pumpand cut-out valve circuits.

Model DH 125 Series 1A, 1A-522, 1A/S-522, 3A,3AR, 3ARA and 400A. Model HS 125 SEris 1,1-521, 1B, 1B-522, 1B/R-522, 1B/S-522, 3B,3BRA and 400B.

SB 29-45 Nov 1970 - O 29 Hand pumps. To introduce punch locking oflever and fulcrum bushes.

Model DH.125, Series 1A, 1A-522, 1A/S-522, 3A,3AR, 3ARA and 400A. Model HS.125, Series 1,1-521, 1B, 1B-522, 1B/R-522, 1B/S-522, 3B,3BRA and 400B

SB 29-46 Mar 1971 - R 29 Landing gear. Air charging valves are replacedby a valve having a safety venting slotmachined along the thread at system end ofbody.

Model DH.125, Series 1A, 1A-522, 1A/S-522, 3Aand 3AR. Model HS.125, Series 1, 1-521, 1B,1B-522, 1B/R-522, 1B/S-522 and 3B.

SB 29-47 Nov 1971 - I 29 Engine driven pump AIR111500. GasketAIR24308 lightly coated with sealant ADS423Lockheed Mod.6356 SB 29-94).

Model DH.125, Series 1A, 1A-522, 1A/S-522, 3A,3ARA and 400A. Model BH.125, Series 400A.Model HS.125, Series 1, 1-521, 1B, 1B-522,1B/R-522, 1B/S-522, 3B, 3BRA and 400B.

SB 29-48 May 1972 - O 29 Hoses to main gear retraction jack. Sleevedhoses introduced to prevent the hoses beingdamaged by chafing.

Model DH.125, Series 1A, 1A-522, 1A/S-522, 3A,3AR, 3ARA and 400A. Model BH.125, Series400A. Model HS.125, Series 1, 1-521, 1B,1B-522, 1B/R-522, 1B/S-522, 3B, 3BRA and400B

SB 29-49 Sep 1972 1 R 29 Replacement of suspect hoses in landing gearand airbrake system.

All variants Series 1 1A 1B 3A 3B 400A 400B andSeries 600A 600B plus items held as spare or instores

SB 29-5 Sep 1965 1 R 29 To introduce new hydraulic hose on engineinstallation.

Series 1, 1A, 1B, 2 and 3

SB 29-50 Aug 1972 - R 29 Auxiliary system. Possibility of malfunction dueto air in pump supply.

Applicable to HS/DH/BH 125 aircraft Series 1B/R,3A, 3A/R, 3A/RA, 3B, 3B/RA, 3B/RB, 400A and400B all variants with Mod.25/1398 embodied

SB 29-54 Sep 1976 3 R 29 To introduce PTFE hoses to replace DunlopW40 hoses PTFE hoses replace Dunlop W40hose introduced on Mod.252955.






SB 29-55 May 1973 - O 29 Reservoir vent outlet at fuselage side.Extension piece added. An extension piece oflight alloy is bonded to the existing vent outlet.

Model DH.125, Series 400A. Model BH.125.Model HS.125, Series 400B, 401B and 403B.

SB 29-57 Sep 1975 - O 29 Main accumulator. To achieve satisfactroysystem cycling times if max allowablecomponent seapage rates are reached duringservice.

Model DH.125, Series 1A, 1A-522, 1A/S-522, 3A,3AR, 3ARA and 400A(C). Model BH.125, Series400A and 600A. Model HS.125, Series 1B,1B-522, 1B/R-522, 1B/S-522, 3B, 3BRA, 3BRC,400B, 403B and 600B.

SB 29-58 Nov 1976 - R 29 Supect pressure hoses at engine drivenpumps.

Applicable to HS/BH 125 aircraft, Series 403B(25274 only), and Series 600A and 600B aircraft.(256030 to 256062 inclusive)

SB 29-59 Jun 1978 1 O 29 Hoses. Introduction of PTFE hoses with type3000 end fittings. Re-designed end fittingshave been standardised by hose manufacturer.


SB 29-6 Aug 1965 2 O 29 To introduce American type chargingconnections.

Series 1A and 1B

SB 29-60 Oct 1980 1 R 29 Hydraulic power - Flow indicator units - Failureof bolts attaching inlet pipe connection sleeve

Applicable to HS/DH/BH 125 aircraft with Viperengines, all Series up to and including Series 600.

SB 29-62 Aug 1978 - R 29 Main System. Introduction of a stainless steelpipe assembly in the suction line.

Series 600A, F600B and 700

SB 29-63 Nov 1978 1 R 29 Main system. To relocate pump low pressureswitches and install snubber units to reducepossibility of switch failure.

Model DH.125, Series 1A with Mod.252606.Model HS.125, Series 400A with Mod.252550,600A with Mod.252468, F600B and 700 and allvariants.

SB 29-64 Aug 1978 - I 29 Main system. Temporary life extension forLockheed MK9 engine driven pumpAIR111500.

Applicable to HS/DH/BH 125 aircraft all series upto and including Series 600A and 600B.

SB 29-65 Jul 1979 1 R 29 Main system. To introduce additional fluidcapacity into the LH pump pressure line.

All Series and variants up to and including 700with TFE 731 engine installation.

SB 29-67 Apr 1979 - R 29 Main System. Ripple Suppressor introduced inpressure line from each engine driven pump.

All Series and all variants up to and including 700with TFE 731 engine installation (PostMod.252691).

SB 29-68 Jul 1979 1 R 29 Engine driven pump-Introduction of pump65WE01030-2 with steel end cover in lieu ofpump with light alloy cover.

All Series and all variants up to and including 700with TFE 731 engine installation.





SB 29-69 Sep 1983 1 R 29 Hydraulic power – Main system – Three-portvalve replaces two-port valve and restrictor insuction line to each engine driven pump

Applicable to all 125 Series aircraft with GarrettTFE 731-3 and 3R engines up to and includingSeries 700A (NA 0248) and 700B (257064)

SB 29-7 Mar 1965 - R 29 To introduce restriction on forward movementof emergency hydraulic hoses between handpump lever.


SB 29-70 Jul 1979 - R 29 Main system. Possible chafing of pipes in rearequipment bay Applicable to all series with TFE731 engines Pre Mod.252660.

This bulletin is applicable to all HS 125 aircraftwith Garrett TFE 731-3 engine installationpre-mod. 25/2660, Series 1A, F-1B, F-1B/S, 3A,F-3B/RA, 400A, F-400B, 600A, F-600B and 700Aand 700B.

SB 29-71 Jul 1979 - R 29 Engine driven pump AIR111500. New shaftseals and duct shields introduced.


SB 29-72 Sep 1979 - R 29 Flexible hoses. Possible sub standard weld ofengine pump pressure hose end fitting inengine pod.

Applicable to HS 125 aircraft of Series 1A, F-1B,F-1B/S, 3A, F-3B, 3A/RA, F-3B/R, 400A, F-400B,600A, F-600B and 700A and 700B

SB 29-73 Dec 1981 - R 29 Hydraulic power - Flexible hoses - Lifelimitation

Applicable to HS/DH/BH 125 aircraft with Viperengines of Series 1, 1-521, 1-522, 1A, 1A-522,1A/S-522, 1B, 1B-522, 1B/R-522, 1B/S-522, 3A,3A/R, 3A/RA, 3B, 3B/RA, 3B/RC, 400A, 403A(C),400B, 403B, 600A and 600B

SB 29-74 Jan 1982 - R 29 Hydraulic power - Main system - To introducepressure filter assy 2125H4

Model DH/HS.125, Series 1, 3 and all variants -Post Mod.251847. Model HS/BH.125, Series 400,401, 403, 600 and all variants.

SB 29-75 Oct 1982 1 O 29 Hydraulic power - Main system - Revisedsealing arrangement for sight tubes on mainand emergency tanks

Model DH/HS.125, Series 1, 3 and all variants.Model HS/BH.125, 400, 401, 403, 600 and allvariants.

SB 29-76 Jan 1983 - I 29 Hydraulic power - Hoses - To introducehydraulic system hoses by the AeroquipCorporation

All BH/DH/HS 125 aircraft up to and includingSeries 700.

SB 29-77 Mar 1983 1 R 29 Hydraulic power - Indication - Removal fromservice of hydraulic pressure switches withsuspect case welding.

Applicable to HS.125 aircraft with Garrett TFE731-3 engines of Series 1A, 3A/RA, 400A,F-400B, 600A, F-600B, 700A and 700B.

SB 29-78 Oct 1983 - R 29 Hydraulic power - Main system - Non-returnvalve introduced at reservoir pressurisationconnection

Applicable to DH/BH/HS/BAe 125 aircraft withGarrett TFE 731 engines up to and including700A (NA0343 and 257197), 700B (257205),800A (258001) and 800B (258002)





SB 29-79 Jul 1984 2 I 29 Hydraulic power - Main system - To introduceflexible hoses at LH engine driven pump

Applicable to all 125 Series 700 aircraft plusearlier Series retrofitted with Garrett TFE 731-3 or-3R engines, post mod.252689.

SB 29-8 Nov 1966 1 I 29 To increase flexibility of hydraulic hosesbetween hydraulic pump and connection at podfillet.

Series 1, 1A and 1B

SB 29-80 Jun 1986 - O 29 Hydraulic power - Introduction of time delay toLP warning circuit

B.A.e 125 Series 800A and 800B aircraft

SB 29-81 Jun 1986 - R 29 Hydraulic power - Fluid resevoir pressurisation- Incorrect non-return valve sealing material

Applicable to all DH/BH/HS/B.A.e 125 aircraft,Post Mod. 252872

SB 29-82 Nov 1987 1 R 29 Hydraulic Power - Introduction of hydraulic tankpressure gauge

B.A.e. 125 Series 800A and 800B aircraft.

SB 29-83 Dec 1987 - O 29 Hydraulic Power - To introduce hydraulic tankpressure gauge at revised location


SB 29-84 Feb 1989 - O 29 Hydraulic Power - Stall Ident Stick Pusher Unit- Simplified Sub-System


SB 29-85 Dec 1987 - R 29 Hydraulic Power - Main System - To introducefiner filter element to suction filter assembly

This mod. is applicable to DH/BH/HS/BAe 125Series 700A and 700B aircraft which are postmod.2525002 and Series 800A and 800B aircraftwhich are post mod.252902.

SB 29-86 Sep 1988 - O 29 Hydraulic power - Indicating - Introduction oftime delay to low pressure warning circuit

Series 700 Mod.252975B and 252509 and AllSeries up to 600 Mod. 299275B/252475, 252556,252608 and 252610

SB 29-87 Apr 1990 - R 29 Hydraulic Power - Thrust Reversers -Introduction of provision for accumulatorcharging labels

Series 800A (Post Mod.259283C)

SB 29-88 May 1992 - R 29 Hycraulic Power - Thrust Reverser System -Introduction of improved pipe connections

Series 800 Post Mod.259283C

SB 29-89 May 1992 - M 29 Hydraulic power - Rear fuselage - Introductionof a charging instruction label for hydraulicsystem accumulators


SB 29-9 Sep 1966 1 O 29 To introduce new hand pump handle for groundservice use.

Series 1, 1A and 1B

SB 29-90 Oct 1992 - O 29 Hydraulic Power - Introduction of a thrustreverser hydraulic isolation valve






SB 29-91 Sep 1993 - R 29 Hydraulic Power - Introduction of hydraulicreservoir labels specifying mineral fluid tospecification, MIL-H-5606 (DEF.STAN.91-48)only

Series 1000

SB 29-94 Mar 1995 - R 29 Hydraulic Power - Inspecion of hydraulicaccumulator installation for presence ofaccumulator charging instruction label

BAe 125 Series 800A, 800B and Hawker 800Post Mod.259283E (258218, 258220, 258225,258230, 258231, 258233, 258235, 258236,258237, 258238, 258241, 258246, 258248,258253, 258254, 258255, 258256, 258259)

SB 29-95 Mar 1995 - M 29 Inspection of hydraulic pipes for possible foulcondition(s).

Applicable to all BAe 125 Series 1000A and1000B and Hawker 1000 aircraft

SB 29-96 Dec 1995 - O 29 HYDRAULIC POWER - To Introduce ThursutReverser Hydraulic Isolation Valve PartNumber HTE960029-2

BAe 125 Series 1000A, 1000B and Hawker PostMod.253351A

SB 29-97 Sep 1996 - R 29 Hydraulic Power - To introduce hydraulic pump,part number 42022-05

Hawker 800XP (258279 and 258285)

SB 29-98 Sep 1996 - R 29 Hydraulic Power - To introduce new non-returnvalve

Hawker 800XP (258279 and 258285)

SB 29-A15 Feb 1966 1 R 29 Hydraulic pressure pipe at frame 20A. chafingagainst cover.

Series 1, 1A and 1B

SB 29-A24 Sep 1966 1 R 29 Pipe union nut fouling against nose legretraction jack ram attachment nut.


SB A29-92 Aug 1994 1 M 29 Hydraulic Power - Inspection for damageof/clearance between pipes, adjacentpipes/components and electrical looms/cables -damage caused by chafing and electrical wiringshort

Applicable to Hawker 1000 and BAe 125 Series1000A and 1000B





ATA Chapter 30Ice and Rain Protection

SB 30-1 Jan 1965 1 R 30 To introduce a reliable capacitor in Napier icedetector NF0075/667.

Series 1, 1A and 1B

SB 30-11 Oct 1968 1 R 30 Hot rod ice detector PBE/A/3. To introduceTeddington Mod.C2036.

Series 1 1A, 1B, 1A/S-522, 1B/S-522, 1B/R-522,3A, 3B, 3ARA, 3BRA, 400A and 400B

SB 30-13 Nov 1970 1 O 30 Detection. To introduce English ElectricMod.2836 to ice detector MK3-NF0075/667(EE SB30-80-1013).

Series 1, 1A, 1A-522, 1A/S-522, 1B, 1B-522,1B/R-522, 1B/S-522, 3A, 3B, 3A/R, 3A/RA,3B/RA, 400A and 400B

SB 30-14 Jun 1970 1 I 30 Ice detector. To introduce English Electric(Napier) Mod.3081 to ice detector Mk3NF0075/667.

Series 1, 1A, 1A-522, 1A/S-522, 1B, 1B-522,1B/R-522, 1B/S-522, 3A, 3A/R, 3A/RA, 3B 3B/RA,400A and 400B

SB 30-15 Oct 1970 1 R 30 To introduce HSD Mod.No28398 to RestrictorValve WGE 150-10 (HSD SB 30-224).


SB 30-16 Apr 1968 - O 30 Introduction of improved type washer in fillerneck of TKS de-icing tank.


SB 30-17 Jan 1969 - R 30 De-icing system tank. To introduce strainer infiller neck.

Series 1, 1A, 1A-522, 1A/S-522, 1B, 1B-522,1B/R-522, 1B/S-522, 3A, 3B, 3A/R, 3A/RA, 3B/R,3B/RA, 400A and 400B

SB 30-18 Feb 1969 - O 30 To introduce Hot Rod ice detector PBE/A/6 inlieu of PBE/A/3.

Series 1, 1A, 1A-522, 1B, 1B-522, 1B/S-522,1B/R-522, 3A, 3B, 3A/R, 3A/RA, 3B/RA, 400Aand 400B

SB 30-19 Jun 1969 - I 30 To introduce English Electric Mod.3178 to icedetector NF0075/667 Mk3.

Series 1 1A 1A-522 1A/S-522 1B 1B-5221B/R-522 3A 3A/R 3A/RA 3B/RA 400A 400B

SB 30-2 Nov 1965 3 O 30 To introduce new TKS de-icing pump for airframe de-icing.

Series 1, 1A and 1B

SB 30-20 Dec 1969 2 I 30 To introduce British Filters Ltd (TKS) Mod.3980to de-icing system filter FJ 2670.


SB 30-21 Jul 1969 - R 30 To introduce Windscreen de-icing pump M2604in lieu of and by conversion of M2601

Series 1, 1A, 1A-522, 1A/S-522, 1B, 1B-522,1B/R-522, 3A, 3B, 3A/R, 3A/RA, 400A and 400B





SB 30-22 Oct 1970 - O 30 De-icing tank contents transmitter. To introduce100 ohm resistor.

Model DH.125, Series 400A. Model HS.125,Series 400B.

SB 30-23 Jan 1971 - R 30 De-icing tank contents transmitter. Oneinstance has occurred of the contents indicatorreading full when the tank was empty.

Model DH.125, Series 400A. Model HS.125,Series 400B.

SB 30-24 Jun 1972 1 M 30 Windscreen de-icing pump. Part A. Hand pumpoperation is unsatisfactory. Part B. Introducesnew seals more compatible with methanol.

Aircraft affected are HS.125 of all series equippedwith windscreen deicing pump M.2604, i.e. postMod 252052

SB 30-3 Nov 1964 - I 30 To introduce anchor bolts for attachment ofwindscreen wiper motors.

Series 1 and 1B

SB 30-30 Oct 1973 3 O 30 New TKS de-icing tank and sight glass locatedrear face of new cockpit bulkhead Piping andwiring adjusted to suit.

Model HS.125, Series 1B-522.

SB 30-3007 Jan 2005 - O 30 Ice and Rain Protection - Wing Anti-IceAnnunciation and Indication SystemModification

Model 400 Beechjet, Serials RJ-1 thru RJ-65;Model 400A Beechjet, Serial RK-1 thru RK-353;Model 400A Hawker 400XP, Serial RK-354.

SB 30-31 Jun 1973 - R 30 To introduce anti-icing fairing at wing tips. Atwo part fibreglass fairing is introduced at eachwing tip.


SB 30-3154 Apr 1998 - M 30 Restricted - See Remarks Hawker 800 U-125A (JASDF) airplanes.

SB 30-3155 Apr 1998 - M 30 Restricted - See Remarks Hawker 800 U-125A (JASDF) airplanes.

SB 30-3156 Oct 1998 - R 30 Ice and Rain Protection - Static Plates - Tointroduce heated forward static plates

HS 125 Series 700A aircraft; HS 125 Series 700Baircraft which are Pre-Mod 252841

SB 30-32 Oct 1974 - O 30 Introduction of improvements to flexible piperuns to reduce the possibility of nylon pipespulling out of connectors.

Model DH.125, Series 1A, 1A-522, 1A/S-522, 3A,3AR, 3ARA and 400A. Model BH.125, 400A and600A. Model HS.125, Series 1, 1-521, 1B,1B-522, 1B/R-522, 1B/S-522, 3B, 3BRA, 400B,401B, 403B and 600B

SB 30-3413 Dec 2000 - R 30 Ice and Rain Protection - 'B' Windshield HeatWiring Change

Hawker 1000

SB 30-3442 Jun 2002 1 R 30 Ice And Rain Protection - Introduction Of A TksHose Replacement

BAe.125 Series 800A airplanes modified by theArkansas Modification Center and/or itspredecessors located in Little Rock, AR; Hawker800XP, Serials 258266, 258277 through 258495,and 258497 through 258580.NOTE: U-125Aairplanes are excluded from the eff





SB 30-3455 Mar 2002 - O 30 Ice and rain protection - Introduction to analternative TKS timer

DH.125 Series 1A; HS.125 Series 1B; DH.125Series 1A-522; HS.125 Series 1B-522; DH.125Series 1A/R-522; HS.125 Series 1B/R-522;DH.125 Series 1A/S-522; HS.125 Series1B/S-522; DH.125 Series 3A; HS.125 Series 3B;DH.125 Series 3A/R; HS.125 Series 3B/R;DH.125 Series 3A/RA; HS.125 Series 3B/RA;HS.125 Series 3B/RB; HS.125 Series 3B/RC;HS.125 Series F3B; HS.125 Series F3B/RA;BH.125 Series 400A; DH.125 Series 400A;HS.125 Series 400B; HS.125 Series 400B/1;HS.125 Series 401B; HS.125 Series 403A(C);HS.125 Series 403B; HS.125 Series F400B;HS.125 Series F403B; BH.125 Series 600A;HS.125 Series 600A; HS.125 Series 600B;HS.125 Series 600B/1; HS.125 Series 600B/2;HS.125 Series 600B/3; HS.125 Series F600B;HS.125 Series 700A; HS.125 Series 700B;BAe.125 Series 800A; BAe.125 Series 800A(C-29A); BAe.125 Series 800A (U-125); BAe.125Series 800B; Hawker 800; Hawker 800 (U-125A)Pre-Mod 25E266A; Hawker 800XP (through S/N258472); BAe.125 Series 1000A; BAe.125 Series1000B and Hawker 1000.

SB 30-38 Jul 1977 1 R 30 Gables chime unit. To improve reliability adiode has been introduced in the positivepower supply to protect against spikes.


SB 30-4 Aug 1965 - R 30 To introduce a modified anti-icing supply keepbracket.

Series 1, 1A ,1B and 2

SB 30-40 Apr 1978 - R 30 TKS De-icing Pump Mounting. Introduction ofrevised Mounting Pump Mounting Bracket.

Model HS/BH.125, Series 400, 401, 403, 600 andall variants. Model HS.125, Series 700 and allvariants.

SB 30-40 - INSP Dec 1977 - R 30 TKS pump installation-Inadeqate clearancebetween mounting bracket and elevator `G'weight.

Model HS/BH.125, Series 400, 401, 403, 600 andall variants. Model HS.125, Series 700 and allvariants.

SB 30-41 Jan 1979 - O 30 Introduction of replacement British Soncebozswitch 482/10.


SB 30-42 Nov 1980 2 O 30 Ice and rain protection - Windscreen panels 'A'- Aircraft wiring revised to utilize maximumpotential servicability of panels






SB 30-43 Oct 1981 1 O 30 Windscreen electrical de-icing system. Toreduce the interference on cockpit indicationsfrom windshield heat cables.

Model HS.125, 700A and 700B.

SB 30-44 Oct 1980 - O 30 Ice and rain protection - Improved TKS pipinginstallation


SB 30-45 May 1981 - I 30 Ice and rain protection - Windscreen de-icing -To introduce replacement suppressor unit

Model DH/HS/BH.125, Series 1, 3, 400, 401, 403,600 and all variants.

SB 30-46 Aug 1985 - R 30 Ice and Rain Protection - Windscreen Panel 'A'Two-level flight heat

Series 800 Pre Mod.252982 (A/C 258002 to 030)800A Mod.252982 (A/C 258032 033 035 036)

SB 30-47 Oct 1986 - O 30 Ice and Rain Protection - Introduction of timedelay to TKS low contents warning

B.Ae.125 Series 800A and 800B. All aircraft up toand including 258079.

SB 30-48 Jun 1988 2 R 30 Ice and Rain Protection - Windows -Windscreen panel À' is replaced to LucasMod. D8155

Series 800A 800B (A/C 258001 to 085)

SB 30-50 Jan 1989 - R 30 Ice and Rain Protection - Airframe De-Icing -Possible TKS tank chafe

Applicable to B.Ae.125 Series 800 aircraft (8091,8094, 8097, 8111 and 8113)


SB 30-52 Sep 1991 - O 30 Windscreen panels À' - Introduction of screentwisted wiring for windscreen heat power andsense circuitry in a segregated route.

Series 800 Pre Mod.253261A

SB 30-53 Aug 1992 2 I 30 TKS anti-icing. Introduction of a low pressurewarning switch into the TKS fluid system.

Series 700A (257017 and 257201)

SB 30-54 Aug 1992 - R 30 Ice and Rain Protection - Introduction of 750VAstatic inverter with revised internal circuits

Series 1000B Post-Mod.253429B

SB 30-55 Jul 1994 - R 30 Windscreen p\Panel A - Introduction of aresistor at the MK.22 thermal controllers

Model BAe.125 Series 800A, 800B, 1000, 1000Aand 1000B. Hawker 800 and 1000.

SB 30-56 Nov 1993 - R 30 Ice and Rain Protection - Inspection ofwindscreen Panel 'A' power cables for chafingon filter unit mounting brackets

Applicable to all BAe 125 Series 800 pre-Mod.253261A and to Series 100 pre-Mod. 253335A

SB 30-57 Dec 1994 - R 30 Windscreen Electrical Anti-ice SystemElectrostatic Filters. Introduction of protectionto cable exit point on Mk.4 filter units

BAe 125 Series 800A and 800B and Hawker 800whcih are Post Mod.253261A. BAe 125 Series1000A, Series 1000B and Hawker 1000 which arePost Mod.253335A.





SB 30-58 Apr 1994 - R 30 TKS anti-icing. Introductoin of new lowpressure warning switch

HS 125, Series 700A aircraft Post Mod.25A225A(257017 and 257201)

SB 30-59 May 1995 2 R 30 Inspection of windscreen panel A and B filterunits for component integrity.

Applicable to all Hawker 800 and BAe 125 Series800A and 800B aircraft including Major variantsC29A and U125

SB 30-6 Dec 1970 1 R 30 To introduce a different power supply sourcefor the TKS de-icing pump motor.

Series 1, 1A and 1B

SB 30-60 Oct 1994 - R 30 Windscreen Panel A - Relocation of Lucas MK4electrostatic filter units

Hawker 1000 (259045)

SB 30-61 Feb 1995 - I 30 Airframe ice protection system. Deletion ofwiring with silver plated conductors from theTKS pump.

BAe 125 Series 800A, 800B, 1000A, 1000B,Hawker 800 and 1000

SB 30-63 Feb 1995 - I 30 Restricted - See Remarks Hawker 800 U-125A (A/C 258247, 258250)

SB 30-64 Feb 1995 - I 30 Restricted - See Remarks Hawker 800 U-125A (A/C 258245, 258247,258250)

SB 30-65 May 1995 - R 30 Inspection of LH and RH panels 'A' and 'B'windscreen anti-ice electrical cable looms forsigns of damage or overheating

Applicable to all BAe 125 Series 1000A and1000B and Hawker 1000 aircraft.

SB 30-66 Jan 1996 - R 30 Restricted - See Remarks Hawker 800 U-125A (A/C 258245, 258247,258250)

SB 30-67 Sep 1995 - R 30 Ice & Rain Protection - Introduction of 38 LitreTKS tank of improved design

Hawker 800XP (A/C 258266 8277 and subs)

SB 30-7 Dec 1973 2 I 30 Introduction of distributor panel D623F/DH125(TKS Mod. 1000).

Series 1, 1A, 1A-522, 1B and 3B- 25015

SB 30-8 Dec 1970 1 O 30 Ice detection. Rotary ice detector NF0075/667to introduce Napier Mod.1851.






ATA Chapter 31Indicating/Recording Systems

SB 31-1 May 1965 - M 31 To bring limitation labels and airspeedindicators with VMO indication into line withfinal position errors for static plates.

Series 1A and 1B

SB 31-10 Apr 1968 - O 31 To introduce power loss indicator type M2179in lieu of type M2086.

Series 1A, 1A-522, 1A/S-522, 1A/R-522, 1B,1B-522, 1B/S-522 and 1B/R-522

SB 31-12 Oct 1970 1 I 31 Flight data recorder. To introduce a steel dustcover for flight data recorder.

Series 1B (25080) and 3B (A/C 25015, 062, 069,116, 128, 140, 169)

SB 31-13 Dec 1968 1 I 31 Flight data recorder. Introducing Pt. A - F542 Pt.No 10019/1 in lieu of 10019. Pt. B - FB542 Pt .No 100550/1 in lieu of 100550.

Series 1-009 (CAFU), 1B-080 (Anglo American),3B-015, 062, 069, 113, 116, 117, 120, 128, 140.

SB 31-14D May 1969 1 R 31 General to introduce counter pointer altimetersystem.

Aircraft 25089

SB 31-14E May 1969 1 R 31 General to introduce counter pointer altimetersystem.

Aircraft Nos.25085 and 25092

SB 31-14F May 1969 1 R 31 Instrument panels. Introducing counter pointeraltimeters.

Aircraft No.25008

SB 31-14G May 1969 1 R 31 Instrument panels. Introducing counter pointeraltimeters.

Aircraft 25003

SB 31-14J May 1969 1 R 31 Instrument panels. Introducing counter pointeraltimeters.

Aircraft No.25125, 25127 and 25128

SB 31-14K May 1969 1 R 31 Instrument panels. Introducing counter pointeraltimeters.

Aircraft No.25125, 25127 and 25128

SB 31-14L May 1969 1 R 31 Instrument panels. Introducing counter pointeraltimeters.

Aircraft No.25125, 25127 and 25128

SB 31-14M May 1969 1 R 31 Instrument panels. Introducing counter pointeraltimeters.

Aircraft 25145

SB 31-14N Jan 1969 - R 31 Instrument panels. Introducing counter pointeraltimeters.

Aircraft No. 25005

SB 31-14P Jan 1969 - R 31 Instrument panels. Introducing counter pointeraltimeters.

Aircraft 25010





SB 31-14Q May 1969 1 R 31 Instrument panels. Introducing counter pointeraltimeters.

A/C 25106

SB 31-14U Aug 1970 - R 31 Instrument panels. Introducing counter pointeraltimeters.

Model HS.125, Series 3B.

SB 31-14V Sep 1970 - R 31 Instrument panels. Introducing counter pointeraltimeters.


SB 31-14W Sep 1970 - R 31 Instrument panels. Introducing counter pointeraltimeters.


SB 31-14X Sep 1970 - R 31 Instrument panels. Introducing counter pointeraltimeters.

Model HS.125, Series 1

SB 31-14Y Sep 1969 - R 31 Instrument panels. Introducing counter pointeraltimeters.


SB 31-14Z Apr 1974 - R 31 Instrument panels. Introducing counter pointeraltimeters.


SB 31-15 Oct 1970 1 I 31 To introduce United Control Mod to Flight DataRecorder magazine 101023 or 100170 for Pt. A- FB 542 Pt. B - F542.

Series 1B (A/C 25/080), 3B (25/015, 062, 069,116, 128) and 3B/RA (25/140, 169)

SB 31-16 Oct 1970 1 I 31 To introduce improved Altitude and AirspeedSensor on United Control Flight Data Recorder10019 type F 542 - S/Nos 2500 & subs.

Series 1B-522 (25/080), 3B (25/015, 062, 069,116, 128) and 3B/RA (25/140, 169)

SB 31-17 Oct 1970 1 I 31 To introduce replacement of Altitude andAirspeed Sensor for Flight Data Recorder Pt.A- F542 Pt.B - FB542.

Series 1B-522 (25/080), 3B (25/015, 062, 069,116, 128) and 3B/RA (25/140, 169)

SB 31-18 May 1969 - I 31 To introduce improved Pitch Servo Assemblycam for Flight Data Recorder FB542.

Series 3B (Aircraft 25015, 25 062, 25069)

SB 31-19 - 257295H May 1970 - I 31 Instruments - To Introduce Penny & GilesMod.9 to Airborne Data Acquisition SystemDrive Unite 206001-1004

Model HS.125, Series 1 and 3BRA

SB 31-19 - 257295J May 1970 - I 31 Instruments - To Introduce Penny & GilesMod.9 to Airborne Data Acquisition SystemDrive Unite 206001-1004


SB 31-19 - 257295K May 1970 - I 31 Instruments - To Introduce Penny & GilesMod.9 to Airborne Data Acquisition SystemDrive Unite 206001-1004






SB 31-2 Mar 1965 - O 31 To introduce Smiths Mod.01 on vibrator unitKVC - 0102.


SB 31-20 Jul 1970 - I 31 SADAS Drive Unit. Introducing new gear box.206001-1004.


SB 31-21 Oct 1970 - I 31 Flight Data Recorders. Removal of Magazineprotector block.

Model HS.125, Series 1B-522, 3B and 3B/RA

SB 31-22 Oct 1970 - I 31 Flight Data Recorders. Introducing new TimerAssembly.


SB 31-23 Oct 1970 - I 31 Flight Data Recorders. Additional capacator inTrip and Date Encoder.


SB 31-24 Oct 1970 - I 31 Flight Data Recorders. Introducing replacementswitch actuator.


SB 31-25 Oct 1970 - I 31 Flight Data Recorders. Introducing areplacement front door latch.

Model HS.125, Series 1B/522, 3B and 3B/RA

SB 31-26 Jun 1971 - O 31 Auto-flight. Reduces light output fromannunciator lights at dimmed level.


SB 31-27 Sep 1971 - I 31 Flight Data Recorder F542 and FB542 Trip andData Encoder 101012. Addition of connectorsealing gasket (UDCSB31-20-6).

Model HS.125, Series 3B and 3B/RA

SB 31-3030 Jun 2001 1 O 31 Indicating/Recording Systems - Introduction oftransient suppressors to relay coils

Hawker 800XP

SB 31-3055 Feb 1999 1 M 31 Instruments - Removal of the fuel flow electricalsignal to the Fairchild F1000 flight datarecorder (FDR)

BAe 125 Series 800A, Hawker 800 and Hawker800XP

SB 31-32 Mar 1974 - R 31 Cockpit. To introduce modified restraining cordattachment for panel CG.


SB 31-3312 May 1999 - R 31 Indicating/Recording Systems - Introduction ofan improved cockpit voice recorder(CVR)/Flight Data Recorder (FDR) controller

BAe 125 Series 700B

SB 31-3351 Nov 1999 - O 31 Restricted - See Remarks Hawker 800 (U-125A).

SB 31-3385 Feb 2002 1 R 31 Installation of transient suppression assembliesacross APU relays

BAe.125 Series 800A/B, Hawker 800, Hawker800XP, Serials 258001 through 258474, equippedwith Garrett GTCP36-150(W) APU.





SB 31-36 Jan 1984 - R 31 Instrument Panels. To introduce two additionalwarning lights to the annunciator block on theLH side of the centre instrument panel.

Model BH/DH/125 Series 400A with Mod.252550. Model HS.125, Series F.400B

SB 31-3622 Mar 2003 - R 31 INDICATING/RECORDING SYSTEMS -Meggitt MK1 Secondary Flight Display (SFD)Replacement

Hawker 800XP, Serial Numbers 258475, 258476,258478 through 258492, 258494 through 258500,258502 through 258511 and 258514 through258519, equipped with Meggitt MK1 SecondaryFlight Display (SFD) P/N 33508-00-01.

SB 31-37 Feb 1985 - O 31 To introduce passenger information displaysystem.

B.Ae.125 Series 700B Aircraft 257215.

SB 31-3702 Dec 2004 - O 31 Indicating/Recording - Installation of TurbineVibration Indication System

Hawker 800XP, Serial 258682.

SB 31-3703 Apr 2005 1 O 31 Indicating/Recording - Installation of auralwarning kit for flap, aileron and elevatorposition

Hawker 800XP, Serials 258541, 258556, 258567and after equipped with Collins Proline 21Avionics.

SB 31-3756 Nov 2008 - O 31 Indicating/Recording Systems - Time DelaySpares Replacement

DH.125 Series 1A; HS.125 Series 1B; DH.125Series 1A-522; HS.125 Series 1B-522; DH.125Series 1A/R-522; HS.125 Series 1B/R-522;DH.125 Series 1A/S-522; HS.125 Series1B/S-522; DH.125 Series 3A; HS.125 Series 3B;DH.125 Series 3A/R; HS.125 Series 3B/R;DH.125 Series 3A/RA; HS.125 Series 3B/RA;HS.125 Series 3B/RB; HS.125 Series 3B/RC;HS.125 Series F3B; HS.125 Series F3B/RA;BH.125 Series 400A; DH.125 Series 400A;HS.125 Series 400A; HS.125 Series 400B;HS.125 Series 400B/1; HS.125 Series F400B;BH.125 Series 600A; HS.125 Series 600A;HS.125 Series 600B; HS.125 Series 600B/1;HS.125 Series 600B/2; HS.125 Series 600B/3;HS.125 Series F600B; HS.125 Series 700A;HS.125 Series 700B; BAe.125 Series 800A;BAe.125 Series 800A (C-29A); BAe.125 Series800A (U-125); BAe.125 Series 800B; Hawker800; Hawker 800 (U-125A); Hawker 800XP andHawker 850XP.

SB 31-38 Oct 1988 1 O 31 To introduce engine instrument cooling. BAe 125 Series 700A and 700B which are PreMod. No.258791 Part B.

SB 31-39 Mar 1987 - M 31 Instruments - Recorders - To introduce FlightData Recorder Fault Annunciation

BAe 125 Series 800B





SB 31-4 Mar 1965 1 R 31 To introduce special airspeed indicator and jetpipe temperature indicator to cater for Viper522 engines and increased performance.

Series 1B (Aircraft 25015 only)

SB 31-40 Sep 1988 - O 31 To introduce engine instrument cooling. Toreduce the operting temperature of the engineinstruments on the centre instrument panel.

Series 700 (Post Mod. 258791)

SB 31-41 Mar 1991 2 I 31 Clocks. To introduce Revue ThommenB18-956 series clocks.


SB 31-42 Oct 1992 - R 31 Indicating/Recording systems - Exhaust - Toinhibit nuisance MWS configuration warningannunication during selecton of reverse


SB 31-43 Mar 1993 - O 31 Indicating/Recording - Multi-Function Display -Introducton of enhanced standard of checklistmodule in MFD symbol generator

Series 1000B (259005, 259007, 259008, 259010,259012 and 259018)

SB 31-44 Jan 1993 - M 31 Indicating/Recording Systems - Roof Panel'CG' - Introduction of an amber screen at theemergency contactor not closed indicator.


SB 31-47 Apr 1994 - O 31 Indicating/Recording - Multi-function Display -Introduction of enhanced standard of checklistmodule in the MDF symbol generator

BAe Series 1000A and 1000B and Hawker 1000.

SB 31-48 Apr 1994 - O 31 Multi-function Display. Introduction of Shortfieldperformance checklist module in the MDFsymbol generator

BAe Series 1000A and 1000B and Hawker 1000

SB 31-49 Jun 1994 - O 31 Indicating/Recording Systems - To introducereplacement flap position transmitter

BAe 125 Series 800B

SB 31-5 Jan 1966 - R 31 Required placards. To introduce A/C limitationslabels with revised auto pilot speeds.

Series 1, 1A and 1B

SB 31-50 Oct 1994 - M 31 Instruments - Indicating/Recording Systems -To introduce data acquisition and recorder unittype PV1584N1

BAe U-125 Series 800A (258215, 258227 and258242)

SB 31-51 Oct 1994 - I 31 To introduce data acquisition and recorder unittype PV1584N1.

BAe 125 Series 1000B (259007, 259010, 259016,259018, 259021, 259022, 259025, 259026,259028, 259029, 259030 and 259032.)


BAe 125 Series 800B (258182 and 258197)






BAe 125 Series 800B (258211, 258222 and258224)

SB 31-54 Dec 1994 - O 31 To introduce four extra parrameters (rollattitude, flap, airbrake and each engine thrust)to teh existing flight data recorder installation.

HS 125 series 700 (257172)

SB 31-55 Apr 1995 - R 31 Restricted - See Remarks Hawker 800 U-125A (A/C 258245, 258247,258250)

SB 31-57 Jul 1995 - R 31 Restricted - See Remarks Hawker 800 U-125A (A/C 258245, 258247,258250)

SB 31-6 Mar 1966 - R 31 Panel Installation flight compartment. Tointroduce special fuel flow indicator and JPTindicator for Viper 522 engines.

Series 1A

SB 31-60 Nov 1998 1 O 31 Indicating/Recording Systems - Introduction offuel contents indicators and fuel flow/usedindicators calibrated in metric units

BAe 125 Series 800B and Hawker 800 post Mod.253149C. Hawker 800XP

SB 31-61 Oct 1996 - R 31 Flight data recorder. Revised roll attitudechannel wiring.

HS 125 Series 700 (257172)

SB 31-7 Sep 1966 - R 31 Panel installation flight compartment. Tointroduce revised JPT indicator top tempcontroller and associated limitations labels.


SB 31-9 Dec 1967 - O 31 To introduce Smiths Mod.02 to instrumentVibrator units KVC0101.






ATA Chapter 32Landing Gear

BJ-CSL-1014-RK-502 Jun 2007 M 32 Landing Gear - Nose Landing Gear (NLG) andMain Landing Gear

Hawker Beechcraft Corporation Model 400A(Hawker 400XP), Serial RK-502

SB 32-1 Jan 1971 2 R 32 To introduce Mods M162 & M161 to Dunlopwheels AH51913 & AH52075.

Series 1 and 1A (25/013 014)

SB 32-10 Jul 1965 2 O 32 Installation of chined tyre. Series 1, 1A and 1B

SB 32-100 Oct 1970 1 O 32 Brakes. To introduce Dunlop Mod.M791 tobrake master cylinders Pt. A - ACM22746 , Pt.B - ACM26274.


SB 32-101 Sep 1968 - R 32 Main. To introduce a machined washer underretaining nut at rod end of strut assembly onmain gear assembly.

Series 3A/R, 3B/R, 3A/RA and 3B/RA

SB 32-101 - INSP Jul 1968 - R 32 Main gear fairings. Insecurity of bearing withinfairing strut eye-end.

Series 3A/R, 3B/R, 3A/RA and 3B/RA

SB 32-102 May 1969 - O 32 Hydraulic power. To increase clearancebetween main wheel and coupling in RHemergency wheel brake pipe line.


SB 32-102 - INSP Jul 1968 - R 32 Wheel brake-pipe installation in main gear bay.Fouling against main wheel tyre.


SB 32-104 Oct 1970 2 I 32 Main gear and doors. To introduce a slipperring on the land of the sliding piston in the maingear oleo.


SB 32-105 Sep 1970 1 I 32 Wheels and brakes.To introduce DunlopMod.M 763 to Maxaret Units - Pt.A - AC61480.Pt.B - AC 61482.


SB 32-106 Sep 1968 - O 32 Improved method of hinging main gear doorjack fittings

Series 1, 1A, 1A-522, 1A/S-522, 1B, 1B-522,1B/S-522, 3A and 3B

SB 32-107 Sep 1968 - O 32 Main gear and doors. To improve theattachment of the main undercarriage door jackfittings.

Series 3A/R, 3A/RA, 3B/R and 3B/RA





SB 32-108 May 1972 4 R 32 Main gear and fairings. Introducing greaser andchannel section bearing races at needle rollerson U/C sidestay and fairing strut.

Series 1, 1A, 1A-522, 1A/S-522, 1A/R-522, 1B,1B/522, 1B/S-522, 1B/R-5222, 3A, 3B, 3A/R,3B/R, 3A/RA, 3B/RA, 400A and 400B

SB 32-109 Dec 1968 1 R 32 Main leg upper casing and trunnion assy.Insecurity of rear trunnion retaining nut.

Applicable to H.S. 125 Aircraft, all Series

SB 32-110 Dec 1968 - I 32 Main gear. To improve mechanical indicatorsystem.

Series 1, 1A, 1A/522,1A/S-523, 1B, 1B/522,1B/S-522, 1B/R-522, 3A, 3A/R, 3A/RA, 3B/RA,400A and 400B

SB 32-111 Jan 1969 - O 32 To introduce Lockheed Mod.5754 to main gearjacks.


SB 32-112 Jan 1969 - O 32 Main gear & fairings. To ensure positive fit ofrear trunnion washer tongues in slots of rearpivot shaft main leg casing.


SB 32-113 Jan 1969 - O 32 To introduce Lockheed Mod.5787 - SB 32-106to main gearjacks.

Series 1, 1A, 1A-522, 1A/S-522, 1B, 1B-522,1B/S-522, 1B/R-522, 3A, 3A/R, 3A/RA, 3B, 3B/R,3B/RA, 400A and 400B

SB 32-114 Jan 1969 - I 32 To introduce Dunlop Mod. M 728 to modulatorunits Pt.A - ACM 22740 Pt.B - ACM 22742(Dunlop SB 32-525).


SB 32-115 Mar 1969 - R 32 Wheels & brakes. To introduce lengthened andcounter-bored main wheel retaining nut.


SB 32-115 - INSP May 1969 1 R 32 Main wheel assembly. Excessive end float ofwheel on the axle.


SB 32-116 Dec 1970 - O 32 Brakes. To introduce rubber plugs to the twinmodulators.

Model DH.125, Series 1A, 1A-522, 1A/S-522, 3A,3AR, 3ARA and 400A. Model HS.125, Series 1,1B, 1B-522, 1B/R-522, 1B/S-522, 3B, 3BRA and400B

SB 32-117 May 1969 - R 32 Main gear mechanical indicating system.Obstruction of indicator movement.

Applicable to H.S. 125, aircraft Series 1B/R, 3A/R,3A/RA, 3B/R, 3B/RA, 400A and 400B

SB 32-118 Nov 1971 1 R 32 To ensure clearance between main gearsequence valve operating rod and shackle.


SB 32-119 Jun 1969 - O 32 To introduce improved hinge fittings on legfairings.






SB 32-121 Apr 1970 1 R 32 Main gear. To introduce new Dunlop brakes AH52430.

Mmodel H.S.125, Series 1

SB 32-122 Mar 1972 2 R 32 Nose Gear and Doors. To introduce drag stayupper pivot pin with increased radius at base oflocating lugs.

Model DH 125, Series 1A, 1A-522, 1A/S-522, 3A,3AR, 3ARA and 400A. Model HS 125, Series 1,1B, 1B-522, 1B/R-522, 1B/S-522, 3B, 3BRA and400B

SB 32-123 Sep 1971 2 R 32 Main gear. To introduce eccentric bush inretraction Jack pivot.


SB 32-124 Dec 1970 - I 32 To introduce improved nose leg torque linkpick-up.

Model DH.125, Series 1A, 1A-522, 1A/S-522, 3A,3AR, 3ARA and 400A. Model BH.125, Series400A. Model HS.125, Series 1, 1B, 1B-522,1B/R-522, 1B/S-522, 3B, 3BRA and 400B

SB 32-125 Aug 1970 - O 32 To introduce new bearing into main gear doorjack body pivot.

Model DH 125, Series 3AR, 3ARA and 400A.Model HS 125, Series 1B/R-522, 3BRA and400B.

SB 32-127 Sep 1970 1 O 32 To provide adjustment for hinge fairing on mainleg fairing.

Model D.H.125, Series 3AR, 3ARA and 400A.Model H.S. 125, Series 1B/R-522, 3BRA and400B.

SB 32-128 Nov 1970 - R 32 Mainwheels. To introduce Dunlop Mod.M938. Model DH 125, Series 1A, 1A-522, 1A/S-522, 3A,3AR, 3ARA and 400A. Model HS 125, Series 1,1B, 1-521, 1B-522, 1B/R-522, 1B/S-522, 3B,3BRA and 400B. Model HS 125, Series 1.

SB 32-129 Jul 1971 1 R 32 To introduce further improvements to resistcorrosion.


SB 32-13 Dec 1970 1 I 32 To introduce Dunlop Mod.M275 on shuttlevalves AH81963 & AH81964 (Dunlop SB29-32).

Series 1, 1A, 1B and 1A-522

SB 32-130 Aug 1970 - I 32 Maxaret Units. To introduce new 'O' rings. All Series prior to 600

SB 32-131 Jun 1970 1 R 32 Sequence and Reversing Valve OperatingLinkage. Omission of retained bolt circlips.

Applicable to H.S. 125 aircraft Series 1B/R-522,3A/R, 3A/RA, 3B/RA, 400A and 400B





SB 32-132 Apr 1973 2 R 32 Nose Gear. Drag stay spring strut. Insufficientextended length causing fatigue failure ofanchorage pin.

Model DH 125, Series 1A, 1A-522, 1A/S-522, 3A,3AR, 3ARA and 400A. Model BH 125, 400A.Model HS 125, Series 1, 1B, 1B-522, 1B/R-522,1B/S-522, 3B, 3BRA and 400B

SB 32-132 - INSP Apr 1973 - R 32 Nose Gear. To increase extended length ofdrag stay strut.

Model DH 125, Series 1A, 1A-522, 1A/S-522, 3A,3AR, 3ARA and 400A. Model BH 125, 400A.Model HS 125, Series 1, 1B, 1B-522, 1B/R-522,1B/S-522, 3B, 3BRA and 400B

SB 32-133 Nov 1970 - I 32 Brake Units. Introducing improved sealing ofretraction pin in cylinder block.


SB 32-135 Jul 1970 - R 32 Landing Gear - Main gear fairing assembly(L.H. and R.H.) - Cracks in internal structure

Applicable to H.S.125, aircraft Series 1, 1A, 1B, 3,3A and 3B pre-Mod. 25/1726

SB 32-136 Dec 1970 - I 32 Main gear. Maxaret installation AH51920.Improved moulded rubber assembly on flexibledrive (Dunlop Mod.M921 SB32-647).

Model DH.125, Series 1A, 1A-522, 1A/S-522, 3A,3AR, 3ARA and 400A. Model BH.125, Series400A. Model HS.125, Series 1, 1B, 1B-522,1B/R-522, 1B/S-522, 3B, 3BRA and 400B

SB 32-137 Dec 1970 - R 32 Maxaret Units AC61480 And AC61482. Tointroduce round section in lieu of squaresection circlip and chamfered spring stop.

Model DH.125, Series 1A, 1A-522, 1A/S-522, 3A,3AR, 3ARA and 400A. Model BH.125, Series400A. Model HS.125, Series 1, 1B, 1B-522,1B/R-522, 1B/S-522, 3B and 400B

SB 32-138 Mar 1971 - R 32 Main gear sidestay. Grease spigot and nippleadded to lower arm and grease hole and flatsin journal.

Model DH.125, 1A, 1A-522, 1A/S-522, 3A, 3AR,3ARA and 400A. Model BH.125, Series 400A.Model HS.125, Series 1, 1-521, 1B, 1B-522,1B/R-522, 1B/S-522, 3B, 3BRA and 400B

SB 32-138 - INSP May 1972 - R 32 Landing Gear - Main Gear Sidestay Assembly -Possibility of undrilled spigots supplied inmodification kits or as replacement items

Model DH.125, 1A, 1A-522, 1A/S-522, 3A, 3AR,3ARA and 400A. Model BH.125, Series 400A.Model HS.125, Series 1, 1-521, 1B, 1B-522,1B/R-522, 1B/S-522, 3B, 3BRA and 400B

SB 32-139 Aug 1971 - O 32 Wheel Brake Units AH52207 and AH52430.Introduction of slush guards AHM6969 andAHM6970 (Dunlop Mod.M721 SB32-588 Rev2).

Aircraft affected are ALL Series except Series 1pre-mod 251189.

SB 32-14 May 1965 1 I 32 To introduce improved torque link assembly onmain & nose gear legs.

Series 1, 1A and 1B





SB 32-140 Nov 1971 - I 32 Tyres. To introduce Nosewheel tyre DR6384T. Model DH.125, Series 1A, 1A-522, 1A/S-522, 3A,3AR, 3ARA and 400A. Model BH.125, Series400A. Model HS.125, Series 1, 1-521, 1B,1B-522, 1B/R-522, 1B/S-522, 3B, 3BRA and400B

SB 32-141 Jan 1972 1 R 32 Nose Wheel Steering. To add restrictor valveinto nose wheel steering ram return line.

Model DH.125, Series 1A, 1A-522, 1/A/S-522, 3A,3AR, 3ARA and 400A. Model BH.125, Series400A. Model HS.125, Series 1, 1-521, 1B,1B-522, 1B/R-522, 1B/S-522, 3B, 3BRA and400B

SB 32-142 Feb 1973 - O 32 Hinge Fairing At Main Leg Fairing. New hingefairing of increased thickness (18 swg) securedby seven bolts instead of five.

Model D.H.125, Series 3AR, 3ARA and 400A.Model B.H.125, Series 400A. Model H.S.125,Series 1B/R-522, 3BRA, 400B, 401B and 403B

SB 32-143 Sep 1972 - R 32 Nose Leg Assy. Introduction of distance tubebetween drag stay pick-up attachment lugs onnose leg casing.

Model DH.125, Series 1A, 1A-522, 1A/S-522, 3A,3AR, 3ARA and 400A. Model BH.125, Series400A. Model HS.125, Series 1, 1-521, 1B,1B-522, 1B/R-522, 1B/S-522, 3BRA and 400B

SB 32-143 - INSP Mar 1972 - R 32 Nose Leg Drag Stay Pick-up Fitting. Possibleloose bushes and cracks.

Model DH.125, Series 1A, 1A-522, 1A/S-522, 3A,3AR, 3ARA and 400A. Model BH.125, Series400A. Model HS.125, Series 1, 1-521, 1B,1B-522, 1B/R-522, 1B/S-522, 3BRA and 400B

SB 32-144 Nov 1983 1 R 32 Landing gear - Main gear retraction jack pivot -Improved eccentric bush


SB 32-144 - INSP Mar 1972 - R 32 Main gear jack pivot assemblies. Eccentricbush rotating in housing.


SB 32-145 Aug 1976 2 O 32 Warning Horn System. Introduction of speedsensitive switch.

Model BH 125, Series 400A. Model HS 125,Series 400B.

SB 32-148 Nov 1973 1 R 32 Main leg rear trunion assembly. Washer lockwire lug fouling during gear retractionextension.

Applicable to HS/DH/BH 125 aircraft, Series1A/R, 1B/R, 3A/R, 3B/R, 3A/RA, 3B/RA, 400A,400B and variants, 600A and 600B





SB 32-149 Jan 1974 - O 32 Main gear electrical indicating. Introduction of asuppression diode across lever lock solenoid.

Model DH.125, Series 1A, 1A-522, 1A/S-522, 3A,3AR, 3ARA and 400A. Model BH.125, 400A and600A. Model HS.125, Series 1, 1-521, 1B,1B-522, 1B/R-522, 1B/S-522, 3B, 3BRA, 400B,401B and 403B and 600B

SB 32-15 Apr 1965 - O 32 To introduce improvements to attachment &adjustment of u/c selector lever assembly.

Series 1

SB 32-150 Apr 1974 - R 32 Main gear doors. Incorrect assy of guide bar. Applicable to HS/DH/BH 125 aircraft, series 1B/R,3A/R, 3B/AR, 400A, 400B, 600A, 600B and allvariants.

SB 32-153 Nov 1974 - O 32 Main gear leg fairing operating strut. Model DH 125, Series 1A, 1A-522, 1A/S-522 and3A. Model HS, Series 1, 1-521, 1B, 1B-522,1B/S-522 and 3B

SB 32-16 Dec 1970 1 R 32 Extension & Retraction. Lockheed jacksAIR45402 & 45403. To introduce LockheedMod.5487.

Series 1, 1A, 1A-522, 1B and 3B- 25015 only.

SB 32-161 Apr 1975 - R 32 Main Leg Forward Attachment. Displacementof Roller Bearing in trunnion.

Applicable to HS/DH/BH 125 aircraft, all series upto and including 600A and 600B

SB 32-162 May 1976 1 R 32 Nose Gear. To reduce the possibility of shimmyan inertia weight is strapped to the uppertorque link pick-up sleeve.

Model DH.125, Series 1A, 1A-522, 1A/S-522, 3A,3AR, 3ARA, 400A and 400A (C). Model BH.125,400A and 600A. Model HS.125, Series 1, 1-521,1B, 1B-522, 1B/R-522, 1B/S-522, 3B, 3BRA,3BRC, 400B, 401B, 403B and 600B

SB 32-164 Oct 1975 - R 32 To introduce modified main gear mechanicalindicators

All DH/BH/HS 125 Series 1 through 600, includingall variants

SB 32-165 Nov 1975 - O 32 Main Wheel Door Sequence Mechanism. Anew steel shackle with increased lug sizes &bushes replaces existing shackle.

Series 1B/R-522, 3A/R 3A/RA 3B/RA 3B/RC400A, 400A(C), 400B, 403B, 600A, 600B

SB 32-166 Jan 1976 - M 32 Dunlop brake control valve. Failure of knifeedges.


SB 32-167 Jan 1976 - M 32 Dunlop emergency brake reducing valve.Failure of knife edges.


SB 32-17 Sep 1969 1 I 32 To introduce new Dunlop wheel AH 52206. Series 1, 1A, 1B and 2





SB 32-174 Jun 1980 4 R 32 Nose wheel steering. Steel pivot links replacelight alloy thus reducing the possibility ofcracking.

Applicable Model DH 125, Series 1A, 1A-522,1A/S-522, 3A, 3AR, 3ARA, 400A and 403A (C).Model BH 125, Series 400A and 600A. Model HS125, Series 1, 1-521, 1B, 1B-522, 1B/R-522,1B/S-522, 3B, 3BRA, 3BRC, 400B and 403B

SB 32-174 - INSP Jun 1976 - R 32 Nose wheel steering. Fracture of pivot linkassembly.

Applicable Model DH 125, Series 1A, 1A-522,1A/S-522, 3A, 3AR, 3ARA, 400A and 403A (C).Model BH 125, Series 400A and 600A. Model HS125, Series 1, 1-521, 1B, 1B-522, 1B/R-522,1B/S-522, 3B, 3BRA, 3BRC, 400B and 403B

SB 32-175 Jul 1976 - I 32 Warning horn circuit. Erie capacitor Pt.number5910-99-011-5572 replaces Hunt's capacitorWA19 no longer available.

All Series prior to 700

SB 32-176 Jul 1978 2 R 32 Main gear. Aft trunnion nut. To introduce animproved method of locking. Existing washercan be modified.


SB 32-180 Apr 1981 2 I 32 Landing gear – Indication – To introduce 'Out ofDown' position warning for landing gearselection lever

All Series up to and including Series 600 (and A/C257001)

SB 32-181 Apr 1977 - O 32 Main gear doors. To provide positive closure onground (with hydraulic power off).

Model BH/HS.125, Series 3AR, 3ARA, 400A and403A (C). Model BH.125, Series 400A and 600A.Model HS.125, Series 600A. Model HS.125,Series 1B/R-522, 3BRA, 3BRC, 400B, 403B and600B

SB 32-182 Jul 1977 - R 32 Nosewheel steering pivot links. Incorrectfitment of one steel link and one alloy link.

Applicable to HS/DH/BH 125 aircraft, all series

SB 32-183 Nov 1977 - R 32 Main gear doors. Possible incorrect attachmentof jack to door.

Applicable to HS/DH/BH 125 aircraft Series1B/R-522, 3AR, 3ARA, 3BRA, 3BRB and 3BRC,and all variants of Series 400, 600 and 700.

SB 32-184 Feb 1992 5 M 32 Landing gear - Nose leg drag stay assembly -Cracking of bridge casting

Applicable to BS/DH/BH 125 aircraft, all Seriespre mod. 253003A

SB 32-185 Feb 1979 - R 32 Indicator. Increased brightness of gear positionindicator lights when dimmed on panel "RY".

Series 700 and all variants

SB 32-186 Jul 1979 - R 32 Landing Gear - Main gear and doors - Possibleseizure of door up-lock spring strut

This bulletin is applicable to all HS/DH/BH 125aircraft post mod. 255640, Series 1B/R-522,3A/R, 3A/RA, 3B/RA, 3B/RC, F-3B/R, 400A,400B, 403A (C), 403B, 600A, 600B and F-600B.





SB 32-187 Nov 1979 - R 32 Landing Gear - Main gear doors - Possibleincorrect assembly of guide bar

Applicable to HS/DH/BH 125 aircraft post mod.255640, Series 1B/R-522, 3A/R, 3A/RA, 3B/RA,3B/RC, F-3B/R, 400A, 400B, 403A(C), 403B,F-400B, 600A, 600B, F-600B, 700A and 700B.

SB 32-188 Jun 1980 - M 32 Wheels and brakes. Emergency brakepressure line adaptor incorrectly drilled.

Applicable to HS 125 aircraft Series 700 up to andincluding constructors number 257093/NA0266.

SB 32-189 Sep 1980 1 R 32 Landing gear - Nosewheel steering -Introduction of improved bushes to steeringlinks

Applicable to HS/DH/BH 125 aircraft with a nosegear assembly pre-mod. 251909 and post mod.252496 Part A, Series 1, 1A, 1A-522, 1A/S-522,1B, 1B-522, 1B/R-522, 1B/S-522, 3A, 3A/R,3A/RA, 3B, 3B/RA, 3B/RC, 400A, 403A(C) and400B

SB 32-19 May 1965 - R 32 To introduce retention of pip-pin to disconnectpin on nose landing gear.


SB 32-190 Aug 1981 - M 32 Landing gear - Main gear - Possible failure tolower

Applicable to HS/DH/BH 125 aircraft all Series upto and including Series 700 without mod. 252837.

SB 32-191 Nov 1982 1 I 32 Landing gear - Nose gear - Introduction of aninertia weight onto the axle barrel

This modification is applicable to all Seriesaircraft.

SB 32-192 Jun 1984 2 O 32 Main gear doors. To introduce new jackattachment fitting.

Model DH/HS.125, Series 3 and all variants.Model HS/BH.125, Series 400, 301, 403, 600 andall variants. Model HS/B.Ae.125, Series 700 andall variants.

SB 32-193 Mar 1984 2 M 32 Landing gear - Wheels and brakes -Replacement of knife edges of unknown life onbrake control valve AC61520

Applicable to HS/DH/BH 125 aircraft all Series upto and including Series 700A and 700B

SB 32-194 Aug 1983 - I 32 Landing gear – To introduce improved sealingrings in main gear wheels – Part A: IntroducesDunlop Mod M10399 – Part B: IntroducesDunlop Mod M10332

Models HS/BH/DH.125 all series up to andincluding 400, 600 and 700.

SB 32-195 Jun 1985 - O 32 To facilitate rigging of main gear downlockmicroswitches.


SB 32-198 Nov 1983 - R 32 Main gear. To revise rigging of the main gear. HS.125, Series 700 aircraft withMod. 252756 PartA.

SB 32-199 Feb 1984 - R 32 Landing gear - Extension and retraction -Cracking of main gear jack cylinder headattachment lugs

Applicable to all HS/DH/BH 125 aircraft up to andincluding Series 700





SB 32-2 Nov 1964 - I 32 To introduce improved main gear oleo plungertube.

Series 1 and 1B

SB 32-20 Jul 1965 - O 32 To introduce new wheel retaining nut Pt. No25UM795.


SB 32-200 Jul 1984 1 M 32 Landing gear - Main gear doors - Cracking ofjack attachment bracket and adjacent structure

Applicable to HS/DH/BH 125 aircraft post mod.255640, Series 1B/R-522, 3A/R, 3A/RA, 3B/RA,3B/RC, F-3B/RA, 400A, 400B, 403A(C), 403B,F-400B, 600A, 600B, F-600B, 700A and 700B

SB 32-201 Jun 1984 - M 32 Landing gear - Main wheels - Cracks at wheelflange

Applicable to all HS/DH/BH aircraft up to andincluding Series 700.

SB 32-202 Mar 1986 3 O 32 Landing gear - Wheels and brakes -Introduction of pressure check facility for wheelbrake pressure systems

All Series up to and including Series700A-NA0343, Series 700B-257205

SB 32-204 Jun 1985 - O 32 Landing gear - Emergency brake reducingvalve introducing an operating cable of largerdiameter

All Series HS/DH/BH/B.Ae.125 Aircraft up to andincluding 800A Aircraft 258060 and 800B Aircraft258058

SB 32-205 Dec 1985 - R 32 Landing gear - Improved quick release strut fornosegear doors

All B.Ae.125 Series 800A and 800B aircraft up toand including aircraft 258040.

SB 32-206 Aug 1985 - I 32 Landing gear - Replacement warning horn All Series HS/DH/BH/B.Ae 125 Aircraft up to andincluding 800A Aircraft 258039 and 800B Aircraft258037.

SB 32-207 Oct 1985 - R 32 Landing gear - Main landing gear - Possibledamage to tyre side walls

Applicable to all HS/DH/BH/BAe 125 aircraft postlong range Mod.255640 A and B.

SB 32-208 Dec 1985 - R 32 Fuselage - Tail bumper - To introduce revisedrear jacking point.

B.Ae.125 Series 800A and 800B aircraft up to andincluding Aircraft 258047.

SB 32-209 Mar 1986 - R 32 Landing Gear - MK.3 Brake Control ValveAC67352 - Filter deleted from exhaustconnection

Model HS.125, Series 700A and 700B. ModelBAe 125, Series 800A and 800B.

SB 32-21 Jul 1965 - O 32 To introduce an increased recess dia insidestay ground lock sockets of main gear.


SB 32-210 Jun 1986 1 R 32 Landing Gear - Nosegear door quick releasestrut - Improved position annunciation

All B.Ae.125, Series 800A and 800B aircraftembodying Mod.253030.

SB 32-211 Apr 1986 - R 32 Landing Gear - Nose gear door pivot brackets -Lightening holes covered

B.Ae.125 Series 800A and 800B.





SB 32-212 Aug 1986 1 O 32 Landing Gear - To introduce a combinednosegear steering/towing pin

B.Ae.125 Series 800A and 800B

SB 32-213 Jul 1986 - O 32 Landing gear - Brake pressure switchesprotection of venting ports

All Series HS/DH/BAe.125 Aircraft up to andincluding 800 Series Aircraft 258071.

SB 32-214 Jun 1990 1 O 32 Landing Gear - Nose - Introduction of a nosewheel spin brake that operates when thelanding gear is retracted


SB 32-215 May 1989 3 R 32 Landing Gear - To introduce warning horninhibit revised circuit


SB 32-216 Mar 1988 1 M 32 Landing gear - Main landing gear sidestayupper arm - Introduction of ultimate life

Applicable to all BAe/HS/DH/BH 125 aircraft

SB 32-217 Feb 1988 - M 32 Landing gear - Nose gear pivot pin - Crack test Appplicable to all HS/DH/BH/BAe 125 aircraft

SB 32-218 Jul 1988 - M 32 Landing gear - Cracking of main gear doorforward hinge fitting

Applicable to al DH/BH/HS 125 aircraft postmod.255640 which have main gear door forwardhinge fittings that have exceeded 600 landings.

SB 32-219 Oct 1987 - R 32 Landing gear - Nose gear door operating struts- Incorrect assembly of spacing washers

Applicable to all HS/DH/BH/BAe 125 aircraft

SB 32-22 Dec 1965 1 R 32 Main gear and fairings. To introduce new maingear retraction arm.


SB 32-220 Sep 1988 - I 32 Landing Gear - Main Gear Fairings and Doors -To introduce steel wing attachment casting formain gear door jack

Series 400, 600, 700 and 800.

SB 32-221 Mar 1989 - R 32 Landing gear - Brakes - Improved alignment ofbrake control valve input mechanism


SB 32-222 Mar 1990 1 R 32 Landing Gear – Main Gear – Introduction ofimproved torque link pivot arrangements.


SB 32-222 - INSP Nov 1989 - M 32 Landing gear – Main gear – Introduction ofimproved torque link pivot arrangements


SB 32-223 Mar 1990 1 R 32 Landing gear - Nose landing gear - Inspectionof steering jack pivot ring for grease nippleinstallation

Applicable to all Series DH/BH/HS/BAe 125aircraf which are post Mod.251909

SB 32-224 Aug 1990 1 M 32 Landing Gear - Main Landing Gear - InspectMLG sidestay to wing pick up fitting foradequate clearance

Applicable to all BAe 125 Series 800A and 800Baircraft





SB 32-225 May 1990 - M 32 Landing Gear - Main Landing Gear - Inspectionof Main Landing Gear sidestay centre pivot


SB 32-226 May 1991 - M 32 Landing Gear - Main gear - Introduction of steeltorque links and reduced axial clearances attorque link pins and knuckle joints


SB 32-227 Oct 1990 1 M 32 Landing Gear - Main Landing Gear - Inspectionof MLG sidestay arm assemblies and torquelinks


SB 32-229 Dec 1992 - R 32 Landing Gear - Inspection of LH main landinggear sidestay assembly to identify upper armswith suspected coarse grained material

Applicable to all BAe 125 Series 800 aircraft

SB 32-23 Jul 1965 - R 32 Inspection of Chined tyres Pt. No DR6383TA/C with Mod.251297 embodied or held asspare parts.

Applicable to nose wheel chined tyres, DunlopPart No. DR6383T

SB 32-230 Nov 1994 2 R 32 Main gear. Introduction of torque link pins withincreased wall thickness and improved greaseplug retention


SB 32-232 Nov 1994 5 O 32 Main gear. To reduce the axial clearances atthe torque link pins and knuckle joints. Toimprove resistance to vibration.

HS 125 Series 600 and Series 700 aircraft.

SB 32-233 Jul 1995 - M 32 Landing gear - Main landing gear - Tointroduce a replacement sidestay jack pivotasembly

All BAe 125 Series 800A. Model DH/BH/HS/BAe125, Hawker 800 and 1000.

SB 32-233 - INSP Jul 1995 2 M 32 Landing gear - Inspection of RH and LH M.L.G.sidestay jack pivot for possible cracking.

All BAe 125 Series 800A. Model DH/BH/HS/BAe125, Hawker 800 and 1000.

SB 32-234 Jun 1994 1 I 32 Landing Gear - Main gear - Introduction ofreplacement bushes at the torque link pins

BAe 125 Series 800

SB 32-235 Nov 1994 - R 32 Landing gear - Inspection of main and noselanding gear wheel tie bolt nuts for possiblecracking

Applicable to 125 DH/BH/HS/BAe Series 1A/B,3A/B, 400A, 400B, 600A, 600B, 700A, 700B,800A, 800B, 1000A, 1000B and Hawker 800 and1000 aircraft

SB 32-239 May 1997 - R 32 Landing Gear - Main gear - To reduce the axialclearances at the torque link pins and knucklejoints

Part B, No.1: All BH/HS 125 series 600 andSeries 700 aircraft (PreMod 253528A). Part B, KitNo.2: BH/HS Series 600 and Series 700 aircraftPost Mod.253528A) (A/C 256038, 257008,257013, 257029, 257052, 257069, 257072,257076, 257135, 257182, 257189)





SB 32-24 Feb 1966 1 R 32 To introduce new oleo seals to main & noselanding gears.


SB 32-240 Nov 1996 - O 32 Restricted - See Remarks Hawker 800 U-125A (JASDF)

SB 32-241 Dec 1996 1 O 32 Introduction of replacement main landing geardownlock microswitch assembly(s).

Model HS/BAe 125 Series 700A/700B post-Mod.252450, 800A/800B (including major variantsC29A and U-125), 1000A and 1000B. Model HS125 Series F600B: 25258. Hawker 800, including800XP. Hawker 1000

SB 32-242 Mar 1997 - O 32 Restricted - See Remarks Hawker 800 U-125A (JASDF)

SB 32-25 Dec 1970 1 R 32 Wheels & Brakes. To introduce Dunlop brakeunit AH52430 in lieu of AH 52207.

Series 1A and 1B

SB 32-26 Jan 1979 1 R 32 To introduce new location of keyway inemergency selector levers of U/C selectorbearing assembly.


SB 32-27 Dec 1965 1 R 32 Main & Nose Wheel Assys (A) Inspection ofhalf hub assy bolts for thread damage (B)Correction of torque load figure on main wheelref plate.


SB 32-28 Dec 1965 - R 32 Nose Gear & Doors. To introduce modifiednose gear doors, Pt. A - existing doors, Pt. B -future production doors.


SB 32-29 Mar 1966 - O 32 Main Wheel. To introduce drain holes in mainwheel nave plate.


SB 32-3 Jan 1984 1 O 32 Landing gear - To introduce a modifiedundercarriage selector bearing assembly

Series 1, 1A and 1B

SB 32-30 Apr 1966 - O 32 Nose gear & doors. To introduce new nosegear centring mechanism.


SB 32-3015 Apr 1999 1 O 32 LANDING GEAR - NOSE WHEEL - To Revisethe Nose Wheel Axel Shimming

BAe 125 Series 800A and 800B (including majorvariants C29A and U1125) (All PreMod.253268A). BAe 125 Series 1000A, 1000Band Hawker 1000, 800 (including major variantU-125A) and Hawker 800XP (All Post Mod.253268A).





SB 32-3016 Jan 1999 1 O 32 Landing Gear - Nose Wheel - To Remove theNose Wheel Spin Brake

BAe 125 Series 1000A, 1000B, 800A and 800B(including mjor variants C29A and U125). Hawker800XP. Hawker 1000 and Hawker 800 (includingmajor variant U-125A)

SB 32-3023 Oct 1999 1 R 32 Landing gear - Replacement of 'LE' grease andinstallation of a corrosion resistant steel springin the main landing gear sidestay spring strut

All DH/BH/HS/BAe 125 Series 1, 3, 400, 600,700, 800(including Major Varients C29A andU125) & 1000; Hawker 800(including MajorVarient U125A, Serial No. 258245, 258247,258250, 258268 & 258288); Hawker 800XP up to& including airplane No. 258317 & Hawker 1000.Hawker 800XP Serial No's. 258311, 258313,258315 & 258317 have accomplished thismodification in part by having Mod. 253800 Part C(To introduce a Mod 253800B Standard MainLanding Gear Sidestay with 'LB' Grease to aircraftwith Main Landing Gear & Nose Landing GearSpring Struts with 'LE' Grease) embodied onproduction. To claim the full embodiment of thismodification, they must modify their remainingstruts as detailed in this Service Bulletin.

SB 32-31 Dec 1970 1 O 32 Position & Warning. Introducing micro switch 1ENN205 Mk 1 version Honeywell BrownMod.CN1197.

Series 1, 1A, 1A-522, 1B, 1B-522, 1B/S-522,1B/R-522 and 3B

SB 32-3128 Sep 1999 - R 32 Landing Gear - Introduction of Kamatics 'KD'Bushings at the Main Landing Gear Side StayPivots

All BAe 125 Series 800A/800B including MajorVariants C29A and U125; Hawker 800 includingMajor Variant U125A; Hawker 800XP; allPost-Mod 253257A (Introduction of steel torquelinks).

SB 32-3135 Jan 2002 2 R 32 Introduction of Improved torque link bushes BAe 125 Series 800 (including Major VariantsC-29A and U-125); Hawker 800; Hawker 800(U-125A), Serials 258245, 258247, 258250,258268, 258288, 258305, 258306, 258325,258333, 258341, 258348, 258360, 258370,258381, 258407, 258427 and 258445; Hawker800XP, Serials 258266, 258277 through 258510;BAe 125 Series 1000 and Hawker 1000.





SB 32-3165 Aug 2003 1 R 32 * Superseded by SB 32-3604 and SB 32-3605 DH.125 Series 1A; HS.125 Series 1B; DH.125Series 1A-522; HS.125 Series 1B-522; DH.125Series 1A/R-522; HS.125 Series 1B/R-522;DH.125 Series 1A/S-522; HS.125 Series1B/S-522; DH.125 Series 3A; HS.125 Series 3B;DH.125 Series 3A/R; HS.125 Series 3B/R;DH.125 Series 3A/RA; HS.125 Series 3B/RA;HS.125 Series 3B/RB; HS.125 Series 3B/RC;HS.125 Series F3B; HS.125 Series F3B/RA;BH.125 Series 400A; DH.125 Series 400A;HS.125 Series 400B; HS.125 Series 400B/1;HS.125 Series 401B; HS.125 Series 403A(C);HS.125 Series 403B; HS.125 Series F400B;HS.125 Series F403B; BH.125 Series 600A;HS.125 Series 600A; HS.125 Series 600B;HS.125 Series 600B/1; HS.125 Series 600B/2;HS.125 Series 600B/3; HS.125 Series F600B;HS.125 Series 700A; HS.125 Series 700B;BAe.125 Series 800A; BAe.125 Series800A(C-29A); BAe.125 Series 800A(U-125);BAe.125 Series 800B; Hawker 800XP; Hawker800(U-125A); BAe.125 Series 1000A; BAe.125Series 1000B and Hawker 1000 equipped withP/N AIR45396-5 steering jacks.

SB 32-32 Dec 1970 1 O 32 Wheels & Brakes. To introduce axle mountedanti-skid units AC61480 & AC61482 Issue 5 inlieu of Issue 4 Dunlop Mod M.08 (Dunlop SB32-157).

Series 1, 1A, 1A-522, 1A/S-522, 1B, 1B-522,1B/S-522, 1B/R-522, 3B

SB 32-3274 Aug 1999 - M 32 Landing Gear - Nose Landing Gear Drag StayRigging Inspection

Hawker 800XP and 800A

SB 32-33 Jun 1970 2 I 32 Main Wheels. To introduce AH52075 Iss3Dunlop Mod.M353 SB32-347


SB 32-3386 Jun 2000 - M 32 Landing Gear - Main landing gear door uplockthread inspection

Hawker 800XP and 800





SB 32-3391 Aug 2000 - M 32 Landing gear - Main landing gear (MLG)actuator cylinder head inspection

Model DH 125 Series 1A, 1A-522, 3A, 1A/R-522,3A/R, 1A/S-522, 3A/RA, 400A. Model HS 125Series 1B, 1B-522, 1B/R-522, 1B/S-522, 3B,3B/R, 3B/RA, 3B/RB, 3B/RC, F3B, F3B/RA,400B, 400B/1, 401B, 403A(C), 403B, F400B,F403B, 600A, 600B, 600B/1, 600B/2, 600B/3,F600B, 700A and 700B. Model BH 125 Series400A and 600A. Model BAe 125 Series 800A(including Major Variants C29A and U125), 800B,1000A and 1000B. Model Hawker 800XP (Prior toSerial 258490), 800 (including Major VariantU125A through Serial 258381) and 1000.

SB 32-34 Nov 1970 2 O 32 Steering. Steering servo AIR45396. IntroducingLockheed Mod.ESA5534 (Lockheed SB32-24).


SB 32-3439 Feb 2002 1 R 32 Landing Gear - Introduction of cutouts to clearthe forward nose landing gear (NLG) doorhinges

Hawker 800XP, Serials 258266, 258277 through258406, 258408 through 258446, and 258448through 258498;Hawker 800(U-125A), Serials258306, 258325, 258333, 258341, 258348,258360, 258370 and 258381.

SB 32-3499 Oct 2001 - M 32 Landing gear - Inspection and removal ofsuspect maxarets (anti-skid device)

Model BH.125, Series 600A. Model HS.125,Series 600A, 600B, 600B/1, 600B/2, 600B/3,F-600B, 700A and 700B. Model BAe.125, Series800A (C-29A, U-125), 800B, 1000A, 1000B andHawker 1000. Hawker 800, 800 (U-125A) and800XP.Model DH 125, Series 1A, 1A-522,

SB 32-35 Nov 1970 2 I 32 Wheels & Brakes. To introduce nosewheelAH52339 Issue 3 in lieu of Issue 2 DunlopMod.M477 (Dunlop SB32-378).

Series 1, 1A, 1A-522, 1B, 1B-522, 1B/S-522 and1B/R-522

SB 32-3516 Jul 2003 - R 32 Landing gear - Nose landing gear torque linkbushing replacement


SB 32-3519 Feb 2003 - M 32 LANDING GEAR - Replacement of NoseLanding Gear Bearing Block Assembly

BAe.125 Series 800A, BAe.125 Series800A(C-29A), BAe.125 Series800A(U-125),BAe.125 Series 800B, Hawker 800,Hawker 800XP and Hawker 800(U-125A), Serials258091 through 258570 and 258579 through258582;All BAe.125 Series 1000A, BAe.125Series 1000B and





SB 32-3522 Sep 2002 - M 32 Landing gear - Dunlop wheel tie-bolt nutsinspection/replacement

DH.125 Series 1A; HS.125 Series 1B; DH.125Series 1A-522; HS.125 Series 1B-522; DH.125Series 1A/R-522; HS.125 Series 1B/R-522;DH.125 Series 1A/S-522; HS.125 Series1B/S-522; DH.125 Series 3A; HS.125 Series 3B;DH.125 Series 3A/R; HS.125 Series 3B/R;DH.125 Series 3A/RA; HS.125 Series 3B/RA;HS.125 Series 3B/RB; HS.125 Series 3B/RC;HS.125 Series F3B; HS.125 Series F3B/RA;BH.125 Series 400A; DH.125 Series 400A;HS.125 Series 400B; HS.125 Series 400B/1;HS.125 Series 401B; HS.125 Series 403A(C);HS.125 Series 403B; HS.125 Series F400B;HS.125 Series F403B; BAe.125 Series 800A;BAe.125 Series 800A(C-29A); BAe.125 Series800A(U-125); BAe.125 Series 800B; Hawker 800;Hawker 800(U-125A) Serial Numbers up to andincluding 258493; Hawker 800XP Serial Numbersup to and including 258581 equipped with Dunlopwheels P/Ns AH51909, AH52075, AH52286,AH52206, AHA1287, AHA1606 and AHA1814.

SB 32-36 Jan 1969 1 I 32 Nose Gear. To introduce revised fits for pinsand bushes on dragstay and leg assy.


SB 32-3604 Aug 2003 - R 32 Landing gear - Nose steering jack rivetinspection


SB 32-3605 Aug 2003 - R 32 Landing gear - Corrosion removal from nosesteering jack valve body


SB 32-3614 Jul 2005 - M 32 Landing Gear - Hawker 800XP Main LegAssembly Identification

Hawker 800XP, Serials 258266, 258277 through258706 and 258708 through 258727.

SB 32-3615 Jul 2005 - M 32 Landing Gear - Hawker 800XP/1000 MLGSidestay Assembly Identification

Hawker 800XP, Serials 258266, 258277 through258706, 258708 through 258727 and all Hawker1000.





SB 32-3696 Jul 2005 - M 32 Landing Gear - Hawker 800XP/1000 MainLanding Gear (MLG) Upper/Lower Arm andSidestay Assembly Re-Identification

This Service Bulletin is being issued becausesidestay components common to the 1 through1000 including 800XP Series aircraft havedifferent life limits but have the same part number.MLG Sidestay Assemblies: Part Numbers25-8UM3-125A, 25-8UM3-126A, 25-8UM3-161A,25-8UM3-162A, 25-8UM3-173A, 25-8UM3-174A,25-8UM3-195A, 25-8UM3-196A, 25-8UM3-205A,25-8UM3-206A, 25-8UM3-209A and25-8UM3-210A with "Pre Mod 25F952A/B(800XP/1000)".

SB 32-3697 Jul 2005 - M 32 Landing Gear - Hawker 800XP Main LegAssembly Plunger Tube Re-Identification

This Service Bulletin is being issued because themain leg assembly plunger tube common to the600, 700, 800 and 800XP Series aircraft havedifferent life limits but have the same part number.Main Leg Assemblies: Part Numbers25-8UM1-239A, 25-8UM1-240A, 25-8UM1-293A,25-8UM1-294A, 25-8UM1-299A, 25-8UM1-300A,25-8UM523-1A, 25-8UM523-2A,25-8UM523-11A, 25-8UM523-12A,25-8UM523-179A, 25-8UM523-180A,25-8UM523-181A, 25-8UM523-182A,259W02333-3, 259W02333-4, 259W02333-3 +PCN W00197, 259W02333-4 + PCN W00197with "Pre Mod 25F952A (800XP)" vibro-etched onmain leg assembly data plate.

SB 32-37 May 1966 - R 32 Main Leg Upper Casing Assy. Security of bushin attachment lug for sidestay.

Aircraft H.S.125. Unit Steering Servodyne. PartNo Air.45396

SB 32-3746 Jul 2007 2 M 32 Landing Gear - Main Landing Gear (MLG)Wheel Tie Bolt and Nut Retirement Life

BAe.125 Series 800A, BAe.125 Series 800A(C-29A), BAe.125 Series 800A (U-125), BAe.125Series 800B, Hawker 800, Hawker 800 (U-125A)Hawker 800XP and Hawker 850XP with MLGwheel assembly Part Numbers AHA1287,AHA1606 and AHA1814.





SB 32-3777 Oct 2006 - R 32 Landing Gear – Main Landing Gear JackImproved Servo Block Mounting

DH.125 Series 1A; HS.125 Series 1B; DH.125Series 1A-522; HS.125 Series 1B-522; DH.125Series 1A/R-522; HS.125 Series 1B/R-522;DH.125 Series 1A/S-522; HS.125 Series1B/S-522; DH.125 Series 3A; HS.125 Series 3B;DH.125 Series 3A/R; HS.125 Series 3B/R;DH.125 Series 3A/RA; HS.125 Series 3B/RA;HS.125 Series 3B/RB; HS.125 Series 3B/RC;HS.125 Series F3B; HS.125 Series F3B/RA;BH.125 Series 400A; DH.125 Series 400A;HS.125 Series 400A; HS.125 Series 400B;HS.125 Series 400B/1; HS.125 Series 401B;HS.125 Series 403A(C); HS.125 Series 403B;HS.125 Series F400B; HS.125-F403B;BH.125-600A; HS. 125-600A; HS.125 Series600B; HS.125-600B/1; HS.125-600B/2;HS.125-600B/3; HS.125-F600B; HS.125 Series700A; HS.125 Series 700B; BAe.125-800A;BAe.125-800A (C-29A); BAe.125-800A (U-125);BAe.125-800B; BAe.125-1000A; BAe.125-1000B;Hawker 1000 and Hawker 800; Hawker 800(U-125A), up to and including Serial Number258797; Hawker 800XP and Hawker 850XP, thru258770.

SB 32-3779 Jul 2006 - O 32 Landing Gear - Side Stay Assembly Lower ArmGrease Fitting Reintroduction

Bae.125 Series 800A; Bae.125 Series 800A(C-29A); Bae.125 Series 800A (U-125); Bae.125Series 800B; Hawker 800; Bae.125 Series 1000A;Bae.125 Series 1000B and Hawker 1000, PostService Bulletin 32-3128 and Post Mod 253549Aor B. Hawker 800 (U-125A), Post

SB 32-38 Jun 1966 - O 32 Wheels And Brakes. To introduce DunlopMod.M438 to brake unit AH52207 (DunlopSB32-330).

Series 1, 1A and 1B

SB 32-3873 Feb 2008 - M 32 Landing Gear - Position SwitchInspection/Adjustment

Mitsubishi Model MU-300, Serials A003SAthrough A091SA; Beechcraft Model 400, SerialRJ-1 through RJ-65; Beechcraft Model 400A,Serials RK-1 through RK-353; Hawker BeechcraftModel 400A (Hawker 400XP), Serials RK-354through RK-511 and RK-514.

SB 32-3896 May 2008 - R 32 Landing Gear - Inspection / Repair of MainLanding Gear Forward Trunnion Upper andLower Barrel Nut

Hawker 850XP, Serial Number 258891; Hawker900XP, Serial Numbers HA-0021, HA-0022,HA-0024, HA-0026, HA-0027, HA-0030, HA-0032and HA-0033.





SB 32-39 Jan 1966 - I 32 Wheels And Brakes nosewheel AH52339. Tointroduce Dunlop Mod.M446.

Series 1 and 1B

SB 32-3908 Sep 2008 - R 32 Landing Gear - Main Landing Gear (MLG) SideStay Assembly Lower Arm Lightening HoleProtection

Hawker 800XP and Hawker 850XP, SerialNumbers 258810 through 258878; Hawker900XP, Serial Numbers HA-0001 throughHA-0055; Hawker 750, Serial Numbers HB-1through HB-5.

SB 32-3920 Aug 2008 - M 32 Landing Gear - Main Landing Gear (MLG)Upper Casing Replacement

BAe.125 Series 800, Serial Numbers 258007 and258012 with right MLG upper casings installed asshown in Table 1 of Section 3.A.; Hawker 800XP,Serial Numbers 258294, 258295, 258298,258463, 258474, 258483 and 258510 with leftMLG upper casings installed and Serial Numbers258289, 258293, 258299, 258483 and 258731with right MLG upper casings installed as shownin Table 1 of Section 3.A.

SB 32-4 Nov 1964 - O 32 To introduce cancellation of the undercarriagehorn warning signal.

Series 1, 1A and 1B

SB 32-40 Nov 1970 2 I 32 Wheels And Brakes. Nosewheel AH51913. Tointroduce Dunlop Mod.M349.

Series 1 and 1A Pre Mod.251336

SB 32-41 Dec 1970 1 I 32 Wheels and Brakes Tyres. To introduce mainwheel tyre DR14623T in lieu of DR14622T(Dunlop Mod.TY10).

Series 1, 1A, 1A-522, 1B, 1B-522 and 3B (25/015,062, 069)

SB 32-42 Nov 1970 1 O 32 Wheels and Brakes. Introduces DunlopMod.M598 and M597 (Dunlop SB 32-425).


SB 32-43A Nov 1970 1 I 32 Wheels And Brakes. Introducing DunlopMod.M545 to Maxaret units - AC61482 (DunlopSB 32-416).


SB 32-43B Nov 1970 1 I 32 Wheels And Brakes. Introducing DunlopMod.M545 to Maxaret units - AC61480 (DunlopSB 32-416).

Series 1, 1A, 1A-522, 1A/S-522, 1B, 1B-522,1B/S-522 ,1B/R-522, 3A, 3B/3A/R, 3A/RA and3B/RA

SB 32-44 Sep 1966 - O 32 Steering Jack. Introduction of AIR 45396/4/8 inlieu of AIR 45396/4/7.

Series 1, 1A, 1A-522, 1A/S-522, 1B, 1B-522,1B/R-522 and 1B/S-522

SB 32-45 Aug 1966 - R 32 Nose Gear And Doors. To introduce a modifiedsteering disconnect pin.






SB 32-46 Aug 1966 - O 32 Nose Gear And Doors. Introducing a modifiedsteering disconnect pin and deleting quickrelease pin retaining chain.


SB 32-47 Aug 1969 2 O 32 To introduce a modified steering sleeve at nosegear.


SB 32-48 Nov 1970 1 I 32 Wheels And Brakes. To introduce DunlopMod.M515 to nosewheel AH52339 (SB32-429).

Series 1, 1A, 1A-522, 1A/S-522, 1B, 1B-522,1B/R-522, 1B/S-522, 3A and 3B

SB 32-49 Nov 1966 - I 32 Wheels And Brakes. Introducing DunlopMod.M603 to main wheel AH52206.


SB 32-5 Nov 1964 - I 32 To introduce Rotax V0601 warning horn. Series 1

SB 32-50 Sep 1966 - R 32 Main Leg Assy. Security of axle assy to mainleg plunger tube.

Applicable to HS.125 aircraft, all Series, and tomain leg assemblies held as spares or in stores.

SB 32-51 Oct 1966 - O 32 Main Wheels. Introduction of new wheelretaining nut.


SB 32-52 Oct 1966 - I 32 Wheels And Brakes. To introduce a parkingbrake mechanism lever with an arm of reducedwidth.


SB 32-53 Oct 1966 - I 32 To introduce U/C warning horn Rotax Pt NoV0603 in place of V0601.


SB 32-54 Jan 1970 1 I 32 Nose Gear And Doors. To introduce animproved nose wheel axle.

Series 1, 1-521, 1A, 1A-522, 1A/S-522, 1B,1B-522, 1B/S-522, 1B/R-522, 3A, 3A/R, 3A/RA,3B, 3B/RA, 400A and 400B

SB 32-55 Sep 1966 - R 32 Steering. Excessive friction in steering controlsystem.

Applicable to H.S. 125 aircraft, all Series.

SB 32-56 Nov 1970 1 O 32 Wheels & Brakes. Brake control valveAC61520. Introduction of Dunlop Mod.M645.

Series 1, 1A, 1A-522, 1A/S-522, 1B, 1B-522,1B/S-522, 1B/R-522, 3A, 3B, 3A/RA and 3B/RA

SB 32-57 Nov 1966 - O 32 Brakes. To introduce a weaker spring betweenpilot's foot and Dunlop toe brake motor

Series 1 1A 1B 3 3A 3B

SB 32-58 Jun 1970 1 O 32 Nose Wheel. To introduce Dunlop Mod.M639to nose wheel AH 52339 (Dunlop SB 32-501).

Series 1 1A 1A/S 1B 1B/S 1B/R 3A 3A/R 3A/RA3B 3B/RA 400





SB 32-59 Dec 1983 4 M 32 Landing gear - Extension and retraction - Tointroduce modified lever and shaft atundercarriage emergency selector shaftassembly

Applicable to BH/DH 125 Series 1, 1A, 1B, 3Aand 3B and all variants thereof up to andincluding Series 3A/RA, 3B/RA and 3B/RC.

SB 32-6 Dec 1965 2 R 32 To introduce Dunlop nose wheel AH52399. Series 1, 1A and 1B

SB 32-60 Mar 1967 1 R 32 Nose Gear & Doors. To introduce a modifiedtorque link pick-up sleeve.


SB 32-61 Dec 1966 - O 32 Extension & retraction. To improve clearancebetween spar & main gear retraction arm.


SB 32-62 Nov 1978 4 R 32 Extension & retraction. Introducing main gearjacks AIR48502/0/1.

Series 1, 1A, 1B, 3, 3A, 3B, 400A, 400B and allderivatives

SB 32-63 Jul 1970 1 O 32 Main gear fairings. To introduce modified maingear fairings.

Series 1, 1A, 1B, 3, 3A, 3B, 1A-522, 1B-522,1A/S-522 and 1B/S-522

SB 32-64 Jan 1967 - R 32 Inadequate engagement of Maxaret drivesplines.

Applicable to H.S.125 aircraft, all Series

SB 32-65 Mar 1970 1 R 32 Hydraulic plate brake assemblies. AH52207 &AH52430. Wheel hub fouling against brakethrust plate.

Applicable to HS.125 aircraft Series 1A, 1B and 3with Brake Assemblies AH.52207 or AH.52430

SB 32-66 Jun 1967 1 O 32 Steering. Alteration to nosewheel steeringhandwheel mechanism stop.


SB 32-67 Aug 1972 1 O 32 Main gear & doors. To increase strength ofpipe clamp ring on main gear.


SB 32-68 May 1967 - O 32 Nose gear. To introduce new steering leverassy with drain hole incorporated at the endfitting.


SB 32-69 Sep 1967 - O 32 Main gear. To provide positive retention ofmain gear side - stay aft attachment bush.


SB 32-7 Jan 1965 1 R 32 To introduce strengthened main gear pivot. Series 1, 1A and 1B

SB 32-70 Jun 1970 1 I 32 Landing Gear - Wheels & brakes. To introducetyre DR 6383T Issue 5 in lieu of Issue 4


SB 32-71 Feb 1968 1 I 32 Main gear. To improve corrosion resistance ofmain gear sidestay assy.

Series 1, 1A, 1B, 1A/S-522, 1B/S-522, 3, 3A, 3B,3A/R, 3B/R and 3B/RA





SB 32-72 Nov 1970 2 R 32 Wheels & Brakes. To introduce DunlopMod.M695 to wheel brake unit AH52420.


SB 32-73 Sep 1967 - O 32 Main Leg Assembly. To introduce a steel maingear series axle retaining nut.


SB 32-74 Aug 1970 1 I 32 Main leg assembly. To introduce modifiedpressure plug axle and plunger tube to maingear oleo assembly.


SB 32-75 Jun 1970 1 O 32 Wheels & Brakes. To introduce DunlopMod.M707 to Maxaret units Part NumberAC61480.


SB 32-76 Sep 1970 1 O 32 Wheels & Brakes. To introduce DunlopMod.M689 to Brake Control Valve AC61520(Dunlop SB 29-78).

Series 1, 1A, 1A-522, 1A/S-522, 1B, 1B-522,1B/S-522, 1B/R-522, 3, 3A, 3B, 3A/R, 3A/RA,3B/RA, 400A and 400B

SB 32-77 Jun 1970 2 O 32 Nose leg. To eliminate nose gear castor frictionPt. A-lower bearing Pt. B-top bearing.


SB 32-79 May 1968 1 O 32 Nose gear & Doors. To introduce special pippin with split key attachment in lieu of thenormal figure 8 shaped loop.

Series 1, 1A, 1A-522, 1A/R-522, 1A/S-522, 1B,1B-522, 1B/R-522, 1B/S-522, 3, 3A, 3A/R, 3A/RA,3B, 3B/R and 3B/RA.

SB 32-8 Feb 1965 - O 32 To facilitate assembly of parking breakmechanism.

Series 1

SB 32-80 Nov 1967 - O 32 Fairings. To obtain full adjustment of up-lockroller main U/C door.


SB 32-81 Jan 1979 2 I 32 Position and Warning. To improve main gearmechanical indicator cables and an indicatorflag arm with a Glacier 'DU' bush.


SB 32-82 Jun 1974 5 O 32 Position and warning. To replace landing gearmicroswitches having screw terminals withswitches having integral leads.

Series 1, 1A, 1A-522, 1A/S-522, 1A/R-522, 1B,1B-522, 1B/S-522, 1B/R-522, 3, 3A, 3B, 3A/R,3A/RA, 3B/RA, 400A and 400B.

SB 32-83 Dec 1967 - R 32 Warning Horn Rotax V0603. Rubber bung ventblocked.

Applicable to HS.125 aircraft. all Series

SB 32-84 Apr 1971 3 R 32 Nose gear and doors. Pt. A - To introduceitems featuring improved corrosion resistancePt. B - To introduce stainless steel bearings.






SB 32-86 Mar 1969 1 R 32 Main gear. To introduce improved details ofhinge fittings to leg fairings.

Series 1B/R, 3A/R, 3A/RA and 3B/RA

SB 32-87 Feb 1968 - R 32 Parking brake lever assembly. Failure of pawlto engage with the rack.

Applicable to HS.125 aircraft all series

SB 32-88 May 1968 - I 32 Nosewheel tyre. To introduce nosewheel tyreDR 6383T issue 6 incorporating DunlopMod.TY 35.

Series 1, 1A, 1A/522, 1A/R-522, 1A/S-522, 1B,1B/522, 1B/R-522-094, 1B/S-522, 3A, 3A/R,3A/RA, 3B, 3B/R, 3B/RA, and 3B

SB 32-89 Jun 1970 3 O 32 Main gear and fairings. To eliminate main gearupper sliding bush failure.

Series 1, 1A, 1A-522, 1A/S-522, 3A, 3A/R,3A/RA, 1B, 1B-522, 1B/S-522, 1B/R-522, 3B,3B/RA, 400A and 400B

SB 32-9 Jan 1971 1 O 32 To introduce Dunlop Mod M118 to axlemounted maxarets AC61480 & AC61482.

Series 1, 1A, 1B and 3B (25/015)

SB 32-90 Jun 1971 3 I 32 Main gear and fairings. To reduce harshness oflanding on initial impact.

Series 1, 1A, 1B, 1A/S-522, 1B/S-522, 1B/R-522,3A, 3B, 3A/R, 3ARA, 3BRA, 400A and 400B

SB 32-91 Feb 1969 1 R 32 Main gear side-stay assembly. Adjustment ofside-stay clearences by a revised procedure.

Applicable to HS.125 aircraft Series 1, 1A, 1B, 2,3, 3A, 3B, 3A/R, 3A/RA and 3B/RA

SB 32-92 Sep 1970 1 I 32 Main gear and fairings. To introduce improvedprotective scheme on main gear axle.


SB 32-93 May 1969 1 I 32 Main gear and fairings. To introduce a maingear casing with increased section material inway of the forward attachment pin.

Series 1, 1A, 1B, 1A/S-522, 1B/S-522, 3, 3A, 3B,3AR, 3BR, 3ARA and 3BRA

SB 32-94 Nov 1972 4 R 32 Main gear and fairings. To improve the servicelife of the main gear by creating greaterresistance to corrosion.

Series 1, 1A, 1B, 1A/S-522, 1B/S-522, 1B/R-522,3B, 3A, 3AR, 3BR, 3ARA, 3BRA, 400A and 400B

SB 32-95 Sep 1970 1 I 32 Dunlop Mod.M693 to introduce master CylinderACM 26274 in lieu of ACM 22746 (Dunlop SB29-86).

Series 1, 1A, 1A-522, 1A/S-522, 1B, 1B-522,1B/R-522, 1B/S-522, 3A, 3AR, 3ARA, 3B, 3BRA,400A AND 400B

SB 32-97 May 1968 - R 32 Main gear doors. To introduce drain holes inskins of main gear doors.

Series 1A/R-522, 1B/R-522, 3A/R, 3B/R, 3A/RAand 3B/RA

SB 32-98 Jul 1968 - I 32 Main gear fairings and doors. To improverunning clearances in main gear doorsequence mechanism.

Series 1A/R-522, 1B/R-522, 3A/R, 3B/R, 3A/RAand 3B/RA. Aircraft No.25094

SB 32-99 Apr 1968 - R 32 Main door up-lock assembly. Failure of doorlock roller to engage in the up-lock hook.

Applicableto HS 125 aircraft Series 3A/R, 3B/R,3A/RA and 3B/RA





SB 32-A197 Aug 1983 - M 32 Landing gear - Extension and retraction -Cracking of main gear jack cylinder headattachment lugs


SB 32-A203 Sep 1985 1 M 32 Landing Gear - Nose gear door quick releasestrut - incorrect closure


SB 32-A228 Aug 1990 - M 32 Landing Gear - Wheels and Brakes - Inspectionof Torque Tightened Nose Wheel LocationPlate Retaining Nuts

Applicable to all BAe 125 Series 800A and 800B

SB 32-A60 Dec 1966 - R 32 Steering. Insecurity of steering disconnect pin. Applicable to HS.125 aircraft, all Series





ATA Chapter 33Lights

SB 33-1 Nov 1964 - I 33 To introduce Grimes tandem type oscillatingbeacon.

Series 1and 1B

SB 33-10 Nov 1982 8 O 33 Lights/wings – Part A and C – Flaps – To addprotective metal skin on inboard underside offlaps (Part A – pre mod. 252798, Part C – postmod. 252798) – Part B – Downward beacon –To add protective silicone skin on leading edgeof beacon

Model DH/HS.125, Series 1BR-522, 3A/R, 3A/RA,3B/RA, 3B/RC with Viper or TFE 731 engine.Series 400, 401, 403 and all variants with Viper orTFE 731 engines. Model HS/BH.125, Series 600and all variants with Viper or TFE 731 engines.Model HS.125, Series

SB 33-11 Mar 1973 - O 33 Downward anti-collision beacon Pt NoG9950-21 replaces G9950-4.

Model DH.125, Series 1A, 1A-522, 3A, 3AR,3ARA and 400A. Model BH.125, Series 400A.Model HS.125, Series 1, 1-521, 1B, 1B-522,1B/R-522, 3B, 3BRA and 400B

SB 33-13 Sep 1975 2 O 33 To introduce protection to leading edge ofGrimes Beacon.

Series 1, 1A, 1-521, 1A-522, 1A/S-522, 1B,1B-522 1B/S-522 3A and 3B

SB 33-14 Sep 1978 2 O 33 Tail navigation. Improved anti-vibrationmounting using three A/V studs.

Model DH.125, Series 1A, 1A-522, 1A/S-522, 3A,3AR, 3ARA and 400A. Model HS.125, 1, 1-521,1B, 1B-522, 1B/R-522, 1B/S-522, 3B and 3BRA

SB 33-15 Jun 1973 - R 33 Central attention getting system cancel switch.Posibility of sticking in cancel position.

Applicable to HS/DH/BH 125 aircraft, Series 400Aand 400B

SB 33-16 Dec 1973 - R 33 Prevention of nuisance illumination of main airvalve annunciators.


SB 33-17 Jan 1974 - R 33 To introduce a time delay unit in vent tankoverflow signal lines to master warning system(MWS).


SB 33-19 May 1974 - R 33 Master warning system. To ensure printedcircuit boards are held securely a retainingplate is attached by screws to board guides.


SB 33-2 Nov 1970 1 O 33 Tailplane navigation lamp. Thorns 80/10/0200.To introduce Thorns Mod.Pt.A 4850 Pt.B 4935(Thorns SB33-4).


SB 33-26 Jun 1975 1 O 33 Introduction of shortened cable to assistremoval of aircraft registration label lamp.






SB 33-27 May 1979 1 O 33 Master warning system. Model BH 125, Series 600A. Model HS 125,Series 600B.

SB 33-28 Jan 1980 1 I 33 Passenger compartment/toilet. Fluorescentlighting inverter unit R2829 replaces R2420/80.

Model HS.125, Series 1B, 1B-522, 1B/R-522,1B/S-522, 3B, 3BRA, 3BRC, 400B, 403B andF600B.

SB 33-29 Oct 1975 - O 33 Engine start switches. Type 2C/206 4 filamentswitches replace two filament types.


SB 33-3 Jan 1967 - I 33 Introduces Grimes anti-collision beaconG9950/1 as an alternative to G9950/4.


SB 33-3163 Apr 1999 - R 33 Restricted - See Remarks Hawker 800 (U-125A) JASDF airplanes

SB 33-32 Jan 1978 - R 33 Strobe navigation lights installation. Chafing ofcables at terminal block in keel.

Applicable to HS/DH/BH 125 aircraft Series 400,600, 700 and all variants.

SB 33-3234 Sep 1999 - O 33 Lights - Replacement of Anti-Collision Beacons BAe 125 Series 800; Hawker 800 and Hawker800XP prior to serial 258440.

SB 33-3244 Apr 1999 - O 33 Instrument panel lighting - Removal of lightingbalance units

BAe 125 Series 1000

SB 33-33 Oct 1980 - R 33 Flight compartment lighting. To improveinstrument panel lighting performance duringVHF transmissions.


SB 33-3395 Apr 2008 3 O 33 LIGHTS - TO INTRODUCE ROUGH RUNWAYPROTECTION FOR LOWERANTI-COLLISION

BAe 125 Series 800; Hawker 800 and Hawker800XP, Post Mod. 25F809A or B; Hawker 750,Hawker 850XP, and Hawker 900XP. If you are nolonger in possession of the airplane, pleaseforward this information to the present owner.

SB 33-34 Oct 1980 - O 33 Rear equipment bay lighting. To introducealternative lamp and socket assembly.

Model DH/HS.125, Series 3 and all variants- postMod.251721. Model HS/BH.125, Series 400, 401,403, 600 and all variants. Model HS/BAe.125,Series 700 and all variants.

SB 33-3444 Apr 2001 - O 33 Lights - Introduction of 20 AMP fuse into entrylight circuit and relocation of 7 AMP fuse forease of fuse replacement

BAe.125 Series 800A, Hawker 800 and Hawker800XP.

SB 33-35 Aug 1981 - O 33 To introduce Licon Switch Part Number 011452101 in lieu of Clare-Pendar Part Number710609-B1-1 and Page Part Number C751 forcockpit light master switch.

Model HS/BH.125, Series 600 and variants.Model HS/BAe.125, Series 700 and variants.





SB 33-3586 Nov 2004 1 M 33 Lights - Pulselite System Deactivation BAe.125 Series 800A and Series 800B, Serials258017, 258108, 258113, 258121, 258125,258127, 258128, 258137, 258138, 258141,258144, 258145, 258147, 258150, 258152,258153, 258155, 258160, 258163, 258168,258170, 258173, 258176, 258178, 258179,258181, 258185, 258189, 258193, 258195,258196, 258200, 258203, 258204, 258206,258209, 258221, 258223, 258230 and 258231;Hawker 800, Serials 258263, 258264, 258265,258269, 258272, 258274 and 258275; Hawker800XP, Serials 258292, 258293, 258294, 258295,258299, 258300, 258304, 258308, 258309,258311, 258313, 258315, 258317, 258318,258319, 258321, 258327, 258329, 258330,258331, 258332, 258334, 258337, 258344,258345, 258354, 258356, 258359, 258366,258368, 258369, 258371, 258372, 258376,258377, 258380, 258382, 258385, 258388,258391, 258394, 258398, 258400, 258403,258405, 258412, 258418, 258419, 258420,258423, 258424, 258425, 258426, 258429,258432, 258440, 254441, 258443, 258446,258448, 258449, 258451, 258458, 258459,258460, 258462, 258467, 258471, 258473,258476, 258484, 258488, 258489, 258490,258495, 258496, 258497, 258500, 258502,258503, 258507, 258508, 258509, 258512,258515, 258518, 258519, 258524, 258529,258530, 258531, 258537, 258541, 258544,258546, 258547, 258550, 258557, 258559,258565, 258566, 258567, 258571, 258574,258575, 258577, 258578, 258580, 258590,258599, 258600, 258602, 258605, 258609,258616, 258624, 258626, 258628, 258631,258634, 258635, 258639, 258641, 258644,258645, 258660, 258665, 258667 and 258668.





SB 33-3682 Mar 2005 - M 33 Lights - Reactivation of Precise FlightPulselite® System

BAe.125 Series 800A and Series 800B, Serials258017, 258081, 258101, 258108, 258113,258117, 258121, 258123, 258125, 258127,258128, 258137, 258138, 258141, 258144,258145, 258147, 258150, 258152, 258153,258155, 258160, 258163, 258168, 258170,258173, 258176, 258178, 258179, 258181,258185, 258189, 258193, 258195, 258196,258200, 258203, 258204, 258206, 258209,258221, 258223, 258230 and 258231; Hawker800, Serials 258263, 258264, 258265, 258269,258272, 258274 and 258275; Hawker 800XP,Serials 258292, 258293, 258294, 258295,258299, 258300, 258304, 258308, 258309,258311, 258313, 258315, 258317, 258318,258319, 258321, 258327, 258329, 258330,258331, 258332, 258334, 258337, 258344,258345, 258354, 258356, 258359, 258366,258368, 258369, 258371, 258372, 258376,258377, 258380, 258382, 258385, 258388,258391, 258394, 258398, 258400, 258403,258405, 258412, 258418, 258419, 258420,258423, 258424, 258425, 258426, 258429,258432, 258440, 258441, 258443, 258446,258448, 258449, 258451, 258458, 258459,258460, 258462, 258467, 258471, 258473,258476, 258484, 258488, 258489, 258490,258495, 258496, 258497, 258500, 258502,258503, 258507, 258508, 258509, 258512,258515, 258518, 258519, 258524, 258529,258530, 258531, 258537, 258541, 258544,258546, 258547, 258550, 258557, 258559,258565, 258566, 258567, 258571, 258574,258575, 258577, 258578, 258580, 258590,258599, 258600, 258602, 258605, 258609,258616, 258624, 258626, 258628, 258631,258634, 258635, 258639, 258641, 258644,258645, 258660, 258665, 258667 and 258668.

SB 33-37 Jul 1986 - R 33 Indicating / Recording Systems - Addition ofcapacitor to master warning system circuitry

B.Ae 125 Series 800A and 800B

SB 33-3748 Dec 2005 - R 33 Lights - Emergency Lighting Wire Modification Hawker 800XP, Serial Numbers 258701 through258704, 258706, 258707, 258708, 258710 and258711.





SB 33-3754 Apr 2006 1 O 33 LIghting - Replacement of Pulselite Control UnitP/N 2400-25-4-4 with Pin 2401S

Bae.125 Series 800A; Bae.125 Series 800B;Hawker 800 and Hawker 800XP, if equipped withPulselite® System installed per STC SA3810SW.

SB 33-3755 Nov 2005 - M 33 Lights - Inspection of Emergency LightingFuses


SB 33-38 Sep 1986 - R 33 Lights - Landing lamp relay - mounting revised B.Ae. 125 Series 800A and 800B

SB 33-3818 May 2007 - O 33 Lights - Introduction of Led Tail Position Light HS.125 Series 700A; HS.125 Series 700B;BAe.125 Series 800A; BAe.125 Series 800B;Hawker 800; BAe.125 Series 1000A; BAe.125Series 1000B; Hawker 1000; Hawker 800XP andHawker 850XP through Serial Numbers 258826,258828 and 258829.

SB 33-3832 Oct 2007 1 R 33 Lights – Pilot's and Copilot's Utility Light WireHarness Upgrade

Model 400A, Beechjet, Serials RK-98, RK-110through RK-353; Model 400A, (Hawker 400XP),Serials RK-354 through RK-484, RK-486 throughRK-518.

SB 33-39 Aug 1988 - R 33 Lights - Passenger compartment lighting - Tosupply the LH cabin reading lights from PS-2Busbar in lieu of PS-1 Busbar

Series 800B

SB 33-3900 May 2008 - M 33 Lights - Inspection / Replacement of the MainEntry Door Emergency Exit Light Lamps

Model 400A, Beechjet, Serials RK-98, RK-110through RK-353; Model 400A, Beechjet (Hawker400XP), Serials RK-354 through RK-484 andRK-486 through RK-547.

SB 33-3911 Sep 2008 - R 33 Lights - Inspection of the Main EntranceEmergency Exit Sign

Model 400A Beechjet, Serials RK-98, RK-110through RK-353; Model 400A Beechjet (Hawker400XP), Serials RK-354 through RK-484, RK-486through RK-547.

SB 33-4 Mar 1967 - O 33 Tail navigation lamp. To introduce anti-shockmount at tail navigation light position.




SB 33-42 Mar 1990 1 R 33 Lighting - Integral lighting - Introduction of KGSelectronics dimmer system. To reduce thepossibility of unacceptable voltage modulationaffecting other A/C systems.

Series 800A Post Mod.253191A





SB 33-43 Oct 1990 1 M 33 Lights - Passenger compartment - Inspection offluorescent lighting system in passenger cabinand toilet

Series 600 aircraft. Series 700 post-mod 259117.Series 800 pre and post mod. 259117

SB 33-44 Apr 1991 1 M 33 Instrument integral lighting. Introduction ofrevised circuitry in dimmer unit D492-05-001.

Series 800A and 800B- Post Mod.253191A andPre Mod.253247A

SB 33-45 May 1992 2 M 33 Cabin and Toilet Fluorescent Lighting.Introduction of power units with an integralcircuit for system fault protection.

Series F600A, 700A, 700B, 800A and 800B

SB 33-46 Feb 1992 - O 33 Lights - Flight deck pad light - Introduction ofreplacement flight deck pad lights

All Series Pre 800 aircraft which are PostMod.252480

SB 33-47 Mar 1993 - R 33 Lights - Inspection of strobe light cables forsigns of damage or insulation breakdown

Applicable to all BH/HS 125 aicraft fitted withstrobe lighting system using Hoskins cables: 600and 700 Series pre Mod. 252838A

SB 33-48 Jun 1994 - O 33 LIGHTS - Rear equipment bay lighting -Introduction of a replacement rear equipmentbay light switch.


SB 33-5 Jul 1967 - O 33 Flight compartment lighting. To introduce awander lamp for the illumination of the lowerfuse panel 'AD'.


SB 33-51 Jan 1995 - O 33 Restricted - See Remarks BAe 125 Series 800A U-125 (258215 and258227)

SB 33-52 Nov 1994 - M 33 Lights - Instrument Panel Lighting - Temporaryrevision of lighting balance system to revert theAircraft to the Pre Mod Standard.

BAe Series 1000A and 1000B

SB 33-53 Jan 1995 - R 33 Restricted - See Remarks BAe 125 Series 800A U-125 (A/C 258215,258227, 258242)

SB 33-54 Jul 1996 - R 33 Restricted - See Remarks BAe 125 Series 800A C-29A (A/C 258129,258131, 258134, 258154, 258156, 258158)

SB 33-55 Jan 1996 - O 33 Restricted - See Remarks Hawker 800 U-125A(A/C 258245, 258247,258250)

SB 33-56 Jun 1996 1 O 33 Lights - Anti collision beacon - To introducerough runway protection to the anti collisionbeacon

Hawker 800XP





SB 33-57 Apr 1997 - O 33 Lights - Cabin and toilet fluorescent lighting -To replace obsolete '66' series fluorescenttubes with AL-'12' series tubes

All DH/BH/HS/BAe 125 Series 1 to 1000 and allHawker 800 and 1000

SB 33-6 Dec 1967 - O 33 To introduce a metal guard strip for wing tipnavigation lamp cover.


SB 33-7 Sep 1969 - O 33 Exterior lighting. Introducing revised settings fortaxi and landing lamps and to make provisionfor further adjustment.

Series 1, 1A, 1A-522, 1A/S-522, 1A/R-522, 1B,1B-522, 1B/S-522, 1B/R-522, 3A, 3B, 3A/R,3A/RA, 3B/RA, 400A and 400B

SB 33-8 Feb 1970 1 O 33 Exterior lighting. Introducing taxi and landinglamps of increased wattage.

Series 1, 1A, 1A-522, 1A/S-522, 1A/R-522, 1B,1B-522, 1B/S-522, 1B/R-522, 3A, 3B, 3A/R,3A/RA, 3B/RA, 400A and 400B

SB 33-9 Jan 1973 2 R 33 Roof panel and radio controller's lights.Transistor voltage regulators introduced toreduce load on rheostat dimming system.

Series 3B/RA 400

SB 33-9 - INSP Mar 1971 - R 33 Roof and controller's lamp dimmer switch.Overheating.

Series 3B/RA 400

SB 33-A18 Feb 1974 - M 33 Revised fuse rating for 5 volt instrument panellighting.

Applicable to HS/BH 125 aircraft Series 600A and600B, post Mods. 25/2260





ATA Chapter 34Navigation/Pitot Static

SB 34-1 Feb 1965 - O 34 Instruments turn/slip indicator. To introducediodes to safeguard against possible overvoltage damage.


SB 34-10 Dec 1970 1 O 34 To introduce mechanism Mod.CN3778 onAltitude Warning Unit M2019 (Mechanism Modleaflet 106).

Series 1, 1A, 1A-522, 1B and 1B-522

SB 34-104 Jul 1976 1 O 34 FL100 Altitude warning system. The altitudeswitch and relevant pipe are deleted from theflight deck.

Model HS 125 Series 1, 1-521, 1B, 1B-522,1B/R-522, 1B/S-522, 3B, 3B/RA & 3BRC, 400B &403B

SB 34-113 Aug 1973 - R 34 Introduction of Avimo pitot head. Model BH.125 Series 600A and Model HS.125Series 600B.

SB 34-114 Oct 1973 - R 34 Flight controls. Torque loading of Collins722-5472-001 servo motor increased from 40lb in to 50 lb in.

Model BH.125 Series 600A and Model HS.125Series 600B.

SB 34-115 Dec 1973 - O 34 To revise the presentation of NAV 1 & NAV 2information to the Captain's and 1st Officer'sflight instruments.

Series 3B/RA (A/C 25162 165 167 168)

SB 34-116 Jan 1974 - R 34 Radio altimeter. Moisture ingress into aerialconnectors.

Model HS.125 Series 3B/RA, 400B and 600B

SB 34-117 Jun 1974 - O 34 Radio altimeter. To fit a radio altimeter typeAHV-6(TRT) in series 400 Aircraft.


SB 34-118 Oct 1982 2 I 34 Navigation - Compass system - Flux detector323A-2G replaces 323-A1

Model HS.125 Series 1, 1B, 1B/522, 3B, 400B,401B, 403B and 600B

SB 34-129 Jun 1977 1 M 34 Rosemount pitot heads model 853JAintroduced as alternative to Avimo.

Model BH.125 Series 600A and Model HS.125Series 600A and 600B

SB 34-13 Oct 1965 - R 34 Introduction of revised pitot/static system foruse when Viper 522 engines are installed.

Series 1B (A/C 25015)

SB 34-130 Mar 1976 - R 34 Gables ATC Transponder controller G3636A.Alteration of internal wiring to preventinteraction between ident circuits.

Model BH.125 Series 600A and Model HS.125Series 600B





SB 34-131 Jun 1976 - O 34 Smiths 3B servo altimeter system. To restrictnuisance activity of display a restrictor is fittedat the back of the instrument.

Model BH.125 Series 600A and Model HS.125Series 600A and 600B

SB 34-135 May 1978 - R 34 Pitot/static test equipment. Adapter blocked byThikol.

Applicable to HS/DH/BH 125 aircraft,all series.

SB 34-136 Oct 1985 1 O 34 Pitot/static drain valves. To introducenon-metallic components into pitot/static draintraps.

Model DH/HS.125 Series 1 and all variants, 3 andall variants, 400, 401, 403, and all variants, 600and all variants, 700 and all variants.

SB 34-137 Nov 1979 - M 34 Introduction of revised setting module foraltitude alerting unit.

All HS, BH and DH.125 Series fitted with SmithsFCS 80 and Smiths Altitude alerting system

SB 34-139 Jul 1981 1 R 34 To introduce skid fairing with metallised innersurface and conductive sealing gaskets.


SB 34-14 Oct 1965 - R 34 Introduction of an additional earth cable in stallwarning circuit.

Series 1, 1A and 1B

SB 34-140 Nov 1981 1 R 34 Navigation - To introduce monitoring of the pitothead heating system

Series 1A, 3A, 400A, 600A and 700A and allvariants (A/C NA201 to 282)

SB 34-141 Jan 1981 - R 34 Static pipelines. Possible distortion of S5 andS6 static balance pipelines.

Model HS.125 Series 700A (up to A/C NA287,except 284) 700B (up to A/C 257124)

SB 34-142 Mar 1983 1 R 34 VLF. To introduce a high resistance electricalbleed path from ventral fin aerial to airframe.

Series 700B with aerial in ventral fin forVLF/Omega navigational system

SB 34-143 May 1983 1 R 34 Pitot/static system drain valves. To introducestronger springs and improved sealingarrangements in the water drain traps.

Model HS.125 series 700A and 700B.

SB 34-144 Nov 1983 1 R 34 EFIS 85. To introduce production standardcooling fan speed sensor unit in place ofprototype unit.

Series 700A (A/C NA331)

SB 34-145 Nov 1983 1 R 34 Navigation - Air data instrumentation -Improved run of static system feeds to I.D.C.C.S.I. instruments

Model DH/HS.125 Series 1A, F400B and 700B

SB 34-146 Feb 1986 1 R 34 Navigation - Flight controls - To introduceimproved static dischargers.

Model HS/BH/DH.125 series 600, 700A and 700B

SB 34-148 May 1985 1 I 34 Navigation - Autopilot Servomotor Capstan -Possibility of Corrosion

Model BAe.125 series 700A, 700B, 800A and800B.





SB 34-149 May 1985 - R 34 Navigation - Air data system revised powersupply circuits

Model BAe.125 series 800A and 800B

SB 34-15 Jan 1979 2 R 34 Introduction of revised pitot static system foruse in conjunction with Viper 522 engines.

Series 1A and 1B

SB 34-150 Apr 1985 - M 34 Navigation - Auto pilot - Auto pilot disengagewarnings

Series 700B (A/C 257208 210) 800B (A/C 258016019 021 022 025 028)

SB 34-151 Dec 1986 1 R 34 VLF/Omega Global system. To introduceanti-damp measures in ventral fin.

All BAe Series 700A and 700B aircraft with anaerial in the ventral fin for V.L.F./Omeganavigational system.

SB 34-152 Jan 1987 1 R 34 Navigation - Weather radar control panel -Inadvertent radar transmission

Applicable to BAe.125 aircraft series 700A, 700B,800A and 800B equipped with Rockwell CollinsE.F.I.S.-85.

SB 34-153 Jan 1987 1 R 34 Weather radar indicator. Possible smokeemission.

BAe.125 Series 700A and 700B

SB 34-154 May 1987 - O 34 Navigation - Improved installation of ventralfairing and very low frequency (VLF) aerial


SB 34-155 Aug 1987 1 R 34 Navigation - Radio altitude indicator - Possiblesmoke emission

Applicable to all HS/DH/BH/BAe.125 aircraftequipped with Rockwell Collins DRI-55 DigitalRadio Altitude Indicator

SB 34-156 Jun 1987 - R 34 Navigation - Mode select panel - Possiblesmoke emission

Applicable to all HS/BH/DH/BAe.125 aircraftequipped with Rockwell Collins MSP-85 ModeSelect Panel.

SB 34-157 Aug 1987 - R 34 Navigation - Autopilot - Introduction of revisedautopilot disconnect warning logic circuit

Series 800B

SB 34-159 Jul 1988 - R 34 Navigation – Autopilot panel – Possible smokeemission

All Series up to and including 800 equipped withRockwell Collins APP-80 or APP-80A

SB 34-16 Feb 1966 - O 34 Introduces revised wiring run for E2B compasslight cable.

Series 1, 1A and 1B

SB 34-161 Sep 1989 - R 34 Restricted - See Remarks Series 800A (A/C 258129 131 134 156 158)


SB 34-163 Oct 1989 1 R 34 Restricted - See Remarks Series 800A (A/C 258129)











SB 34-17 Feb 1966 - O 34 Introduction of interchanged stall test switchpositions.

Series 1 1A 1B

SB 34-170 Oct 1990 - R 34 Restricted - See Remarks Series 800A (A/C 258129 131 154 156 158)

SB 34-171 Jul 1991 - O 34 Flight enviroment. To introduce altitude alertingsystem.

Series F400B

SB 34-172 Dec 1992 - R 34 Autopilot. To introduce software mod toADZ-810 digatal air data computer.


SB 34-173 Jun 1994 - R 34 To introduce revised avionics standardcommunications bus (ASCB) databus cablescreen linking at test connectors.


SB 34-174 Oct 1994 - O 34 NAVIGATION - Introduction of an improvedstandard of Weather Radar (Primus 870)

BAe.125 Series 1000A and 1000B and Hawker1000

SB 34-175 May 1994 - O 34 Intrduction of a revised pipe configuration at theleft hand forward static plte (serviceevaluation).

Model HS.125 Series 700A

SB 34-176 Jun 1966 - I 34 Restricted - See Remarks

SB 34-177 Jun 1966 - I 34 Restricted - See Remarks

SB 34-178 May 1995 - O 34 Weather radar. To revert weather radar systemfrom Primus 650 to Primus 870

BAe. 125 Series 1000B

SB 34-179 Feb 1995 - I 34 Restricted - See Remarks Hawker 800 U-125A (A/C 258250)

SB 34-18 Mar 1966 - R 34 Introduction of separate ASI & Mach warningswitches on independent supply lines.

Series 1A/522

SB 34-180 Jan 1996 - R 34 Restricted - See Remarks Hawker 800 U-125A (258245, 258247, 258250)

SB 34-181 Mar 1995 - I 34 Restricted - See Remarks Hawker 800 U-125A (258245, 258247, 258250)







SB 34-184 Feb 1996 - O 34 Navigation - GNS - GNS500A, Series 5 withGPS in lieu of GNS500-3B VLF system

Model HS.125 Series 700 (257181, 257183,257190, 257194, 257205, 257211)

SB 34-185 Feb 1996 - O 34 Power supplies. To improve switching betweenDME transceiver and range converter.

Model HS.125 Series 600

SB 34-187 Nov 1996 - O 34 Restricted - See Remarks Hawker 800 U-125A (JASDF)

SB 34-188 Oct 1996 1 M 34 To check the total air temperature (TAT) probewiring to the air data computer (ADC) atconnector 'RWF'

Hawker 800 and 800 XP

SB 34-189 Nov 1996 - R 34 Restricted - See Remarks Hawker 800 U-125A

SB 34-19 Dec 1970 1 O 34 Introduces Mod.CN4250 to altitude switchM2019U in altitude warning system.

Series 1, 1A, 1A-522, 1B, 1B-522 and 3B

SB 34-190 Mar 1997 - M 34 Navigation - Display processor unit (DPU-86S)part number CPN 622-9285-003/004 andmultifunction processor unit (MPU-86S) partnumber CPN 622-9286-003/004 - Correction tomap course line orientation for off-screenVOR2.

BAe.125 Series 800A,800B and Hawker 800 and800XP

SB 34-192 Dec 1996 - M 34 Restricted - See Remarks Hawker 800 U-125A

SB 34-2 Feb 1965 - O 34 To introduce Smiths Mod.04 on KAE 0701/Waccelerometer.

Series 1, 1A,1B and 2

SB 34-20 Dec 1970 1 O 34 Introduction of Ferranti Mod.FMC/EN forartificial horizon direction indicator invertorsF1-10 and F1-14.

Series 1, 1B 1B-522, 1B/S-522, 1B/R-522, 3B,and 3B/RA

SB 34-21 Dec 1970 1 I 34 Introduces Smiths altitude switch1103/KSD/BU/1 Mod.01.

Series 1, 1A, 1A-522, 1A/S-522, 1B, 1B-522,1B/S-522, 1B/R-522, 3A, 3A/R, 3A/RA, 3B and3B/RA

SB 34-22 Nov 1970 1 I 34 To introduce Smiths Mod.10 to altimeterKAA1603 W1.

Series 1, 1B, 1B/S-522, 1B/R-522, 3B and 3B/RA

SB 34-23 Oct 1966 - R 34 Introduction of ASI Smiths Mod.01 to KAB37Series.


SB 34-24 Nov 1966 - O 34 To introduce improved MACH/ASI pulse unit. Series 1, 1A, 1B, 3A and 3B





SB 34-25 Nov 1970 1 I 34 Airspeed indicator. Introduction of SmithsMod.03 to airspeed indicator KAB31 Series.

Series 3B (A/C 25015 062 069)

SB 34-26 Nov 1970 1 O 34 Introduces Ferranti Mod.FMC/GH to inverterF1-10 (Ferranti SB 34-32).

Series 1, 1B, 1B-522, 1B/S-522, 1B/R-522, 3Band 3B/RA

SB 34-27 Nov 1970 3 I 34 Introduces Mod.Z110 to altitude switches inaltitude warning system.


SB 34-28 Nov 1970 3 O 34 Introduces Ferranti Mod.FMC/FL to artificialhorizon gyro FH11E.

Series 1, 1B and 3B

SB 34-29 Nov 1970 1 I 34 Altimeter. To introduce Smiths Mod.11 toAltimeter KAA 1603/W1.

Series 1, 1B, 1B-522, 1B/S-522, 1B/R-522, 3B,3B/R and 3B/RA

SB 34-3 Mar 1965 - I 34 Structural provision for Collins flux detector isprovided for in LH wing.

Series 1, 1A and 1B

SB 34-30 Oct 1970 1 O 34 To introduce Smiths Mod.05 to mach switch0400KMB.


SB 34-3028 Jan 1998 - M 34 Navigation. Inspection of flight control cablesand pitot pipes for a worn or chafed condition.


SB 34-31 Jan 1973 2 R 34 Stall warning system. To introduce separateA/V mountings for stall detector units.

Series 1, 1A, 1B, 1A/R, 1B/R, 1A/S-522,1B/S-522, 3A, 3B, 3A/R, 3B/R, 3A/RA and 3B/RA

SB 34-3109 Sep 1998 - O 34 Navigation - Introduction of static sourcerevisions for air data controllers 1 and 2

HS/BAe 125 Series 700, Serials 257001 through257215

SB 34-3110 Feb 2005 9 O 34 Navigation - Air Data Computer Increasedaccuracy (Honeywell)

BAe 125 Series 800A/B; Hawker 800; Hawker800XP, Serial Numbers up to and including258358.

SB 34-3166 Dec 2002 5 O 34 Navigation - Air Data Computer IncreasedAccuracy (Collins)

BAe 125 Series 800; Hawker 800; Hawker800XP, Serial Numbers up to and including258357.

SB 34-3174 Jun 1998 - R 34 Restricted - See Remarks Hawker 800 (U-125A) JASDF airplanes, SerialNumbers 258245, 258247, 258250, 258268 and258288.

SB 34-32 May 1968 - O 34 To introduce Smiths Mod.02 to mach/ASIindicator 202 AMA/1 (Smiths SB 34-202).

Series 1A, 1A-522, 1A/R-522, 1A/S-522, 1B,1B/522, 1B/R-522, 1B/S-522, 3A, 3A/R, 3A/RA,3B, 3B/R and 3B/RA.





SB 34-3207 Aug 1999 - M 34 Navigation - Inspection of pitot/static and stallvent drain valves

All DH 125 Series 1A, 1A-522, 3A, 1A/R-522,3A/R, 1A/S-522, 3A/RA, 400A; All HS 125 Series1B, 1B-522, 1B/R-522, 1B/2-522, 3B, 3B/R,3B/RA, 3B/RB, 3B/RC, F3B, F3B/RA, 400B,400B/1, 401B, 403A(C), 403B, F400B, F403B,600A, 600B, 600B/1, 600B/2, 600B/3, F600B,700A, 700B; All BH 125 Series 400A, 600A; AllBAe 125 Series 800A (including Major VariantsC29A and U125), 800B, 1000A, 1000B; AllHawker 800 (including Major Variant U125A,Serials 258245, 258247, 258250, 258268,258288, 258305, 258306, 258325,258333 and258341); Hawker 800XP, Serials 258266, 258277through 258304, 258307 through 258324, 258326through 258332, 258334 through 258340, 258342through 258347, 258349 through 258359, 258361through 258369, 258371 through 258380, 258382through 258406, 258408 through 258425, 258434and 258447; All Hawker 1000.

SB 34-3216 Jul 2004 3 O 34 * Superseded by SB 34-3672 BAe 125 Series 1000; Hawker 1000.

SB 34-3223 Aug 1999 - O 34 Navigation - Temporary sealing pitot/static andstall vent drain valves with RTV sealant

All DH 125 Series 1A, 1A-522, 3A, 1A/R-522,3A/R, 1A/S-522, 3A/RA, 400A; All HS 125 Series1B, 1B-522, 1B/R-522, 1B/2-522, 3B, 3B/R,3B/RA, 3B/RB, 3B/RC, F3B, F3B/RA, 400B,400B/1, 401B, 403A(C), 403B, F400B, F403B,600A, 600B, 600B/1, 600B/2, 600B/3, F600B,700A, 700B; All BH 125 Series 400A, 600A; AllBAe 125 Series 800A, 800B, 1000A, 1000B; AllHawker 800; Hawker 800XP; All Hawker 1000.

SB 34-3236 Sep 2000 3 R 34-00 Navigation - Year 2000 Readiness SoftwareAnomaly

All RAC Models delivered prior to January 1, 2000

SB 34-3248 Oct 2000 1 O 34 Navigation - Introduction of Interposers (Filters)on Multi-Function Display (MFD) SymbolGenerator and Symbol Generators 1 and 2

Hawker 800XP, Pre Mod. 25F867A, whenequipped with Honeywell Flight Control Systems.

SB 34-3249 Jan 2001 1 R 34 Navigation - Installation of nose avionicsexhaust fan filter to reduce electro-magneticinterference

Hawker 800 XP, Aircraft Serial Numbers 258277,258279, 258283, 258284, 258288, 258305,258306, 258318, 258324, 258327, 258328,258358, 258369 and 258380 (aircraft equippedwith Collins avionics and Baker audio systems).





SB 34-3282 Aug 1999 - R 34 Navigation - Modification of pitot/static and stallvent drain valves

All DH 125 Series 1A, 1A-522, 3A, 1A/R-522,3A/R, 1A/S-522, 3A/RA, 400A; All HS 125 Series1B, 1B-522, 1B/R-522, 1B/2-522, 3B,3B/R,3B/RA, 3B/RB, 3B/RC, F3B, F3B/RA, 400B,400B/1, 401B, 403A(C), 403B, F400B, F403B,600A, 600B, 600B/1, 600B/2, 600B/3, F600B,700A, 700B; All BH 125 Series 400A, 600A; AllBAe 125 series 800A (including major variantsC29A and U125), 800B, 1000A, 1000B; AllHawker 800 (including Major variant U125A,Serials 258245, 258247, 258250, 258268,258288, 258305, 258306, 258325, 258333,258341); Hawker 800XP, Serials 258266, 258277through 258304, 258307 through 258324, 258326through 258332, 258334 through 258340, 258342through 258347, 258349 through 258359, 258361through 258369, 258371 through 258380, 258382through 258406, 258408 through 258425, 258434and 258447; All Hawker 1000.

SB 34-3292 Aug 2001 1 M 34 Navigation - Inspection/replacement of theHoneywell attitude heading reference system(AHRS) resistors

Hawker 800XP equipped with Honeywell Single’LASEREF’ or Honeywell AHRS, including serials258279 through 258282, 258285 through 258287,258289 through 258304, 258307 through 258317,258321, 258323, 258329, 258330, 258332,258335 through 258340, 258343 through 258347,258349, 258350, 258353 through 258356,258358, 258359, 258361 through 258369,258371 through 258380, 258382 through 258395.

SB 34-33 Oct 1968 - R 34 Pitot/static system. To improve pipe-runs ininstrument static system.

Series 1, 1A, 1A-522, 1A/S-522, 1A/R-522,1B,1B, 1B-522, 1B/S-522, 1B/R-522, 3, 3A, 3B,3A/R, 3B/R, 3A/RA and 3B/RA.





SB 34-3368 Oct 2002 3 O 34 Navigation - Modification of wiring to enable theautopilot disconnect horn to be on in acontinuous state

Hawker 800XP serials 258297 through 258304,258307 through 258324, 258326 through 258332,258334 through 258340, 258344, 258345,258347, 258349, 258354 through 258356,258358, 258359, 258361 through 258369,258371 through 258380, 258382 through 258406,258408 through 258426, 258428 through 258444,258446 through 258468, 258470 through 258492,258494 through 258512, 258514 through 258532,258534 through 258540, 258542 through 258555and 258557 through 258566 equipped with theHoneywell Avionics Suite and Hawker 800XPaircraft with the Honeywell Avionics Suite installedby STC SA7377SW. Aircraft Serial Number258450 and subsequent incorporating JAR-AWOCat II Aural Warning per Drawing No. 138-339016installed during completion meet the intent of thisService Bulletin and no further action isnecessary.

SB 34-3381 Mar 2004 5 O 34 Navigation - Air data computer increasedaccuracy (Rockwell Collins)

BAe.125 Series 800A Major Variant C-29Aequipped with Rockwell Collins ADC-82A Air DataComputers.BAe.125 Series 800A and 800Bequipped with Rockwell Collins ADC-82A Air DataComputers.

SB 34-34 Dec 1968 - I 34 To introduce Smiths Mod.02 to mach switch1402/KMB/CP/1.

Series 3A, 3A/R, 3A/RA and 400A

SB 34-3412 Mar 2001 - M 34 Navigation - Replacement of Rosemount PitotProbes

Hawker 800XP, Serial 258266, and Serials258277 through 258500.

SB 34-3415 Oct 2000 - O 34 Air data computer increased accuracy(Honeywell)

BAe 125 Series 1000A, Serials 259005, 259012through 259015, 259020, 259023 and 259033,when equipped with Honeywell AZ-810 Air DataComputer P/N 7000700-945.

SB 34-3432 Mar 2001 - O 34-00 NAVIGATION - Introduction Of Traffic Alert AndCollision Avoidance System (TCAS) Change 7

Raytheon Aircraft Beechjet Model 400A, SerialsRK-1 through RK-299, RK-301 through RK-325,and RK-327 and after when equipped with aRockwell Collins TCAS-94 TTR-920 TCASReceiver/Transmitter.

SB 34-3454 Apr 2001 - O 34 Navigation - Introduction of traffic alert andcollision avoidance system (TCAS) Change 7

BAe. 125 Series 800A, Hawker 800/800XPaircraft equipped with Rockwell Collins TCAS-94Unit (TTR-920, P/N 622-8971-120) installed bySTC SA8768SW up to and including 258505 and258507.





SB 34-3462 Apr 2001 - O 34 Introduction of traffic alert and collisionavoidance system (TCAS) Change 7

BAe. 125 Series 800A, Hawker 800/800XPairplanes equipped with Honeywell/L3Communications TCAS-2000 Unit (RT-951, P/N7517900-55002) installed by STC ST09461SC upto and including 258505 and 258507.

SB 34-3463 May 2001 - O 34 Introduction of traffic alert and collisionavoidance system (TCAS) Change 7

BAe. 125 Series 800A, Hawker 800/800XPairplanes equipped with Honeywell/L3Communications TCAS II Unit (RT-910, P/N4066010-904) installed by STC SA8588SW up toand including 258505 and 258507.BAe. 125Series 1000A and Hawker 1000 airplanesequipped wit

SB 34-3502 Jan 2002 - M 34 Navigation - Suspension of approval to operatein RVSM airspace

Hawker 800XP, Serials 258514, 258515, 258518through 258522, 258524 through 258527, 258529through 258531, 258537, 258539 and 258544.

SB 34-3503 Feb 2002 1 R 34 Navigation - Restoration of RVSM groupapproval

Hawker 800XP, Serials 258514, 258515, 258518through 258522, 258524 through 258527, 258529through 258531, 258537, 258539 and 258544.

SB 34-3517 Jan 2003 1 O 34 Navigation - Air Data Computer IncreasedAccuracy (Collins)

Hawker 800XP, Serial Numbers 258541, 258556,258567 through 258586.

SB 34-3535 Jul 2002 - R 34 NAVIGATION & PITOT/STATIC -MODIFICATION TO CORRECT ERRONEOUSOPERATION OF THE COLLINS ALT-4000RADIO ALTIMETER

Hawker 800XP, Serial Numbers 258278, 258541,258556 and 258567 through 258585, equippedwith Collins Pro Line 21 Avionics and CollinsALT-4000 Radio Altimeter.

SB 34-3556 Dec 2002 - R 34 NAVIGATION - Introduce Flight ManagementSystem (FMS) Performance

Hawker 800XP, Serials 258541, 258556, 258567through 258614.

SB 34-3557 Dec 2002 - R 34 Navigation - Reduce N1 Amber Annunciations Hawker 800XP, Serials 258541, 258556, 258567through 258614.

SB 34-36 May 1970 2 O 34 Radio navigation. To improve performance ofVOR aerial system.

All Series up to and including 3B/RA and A/C25062 069

SB 34-3628 Nov 2003 - R 34 Navigation - Installation of Improved PitotProbes

Mitsubishi Model MU-300, Serials A003SAthrough A091SA; Model 400 Beechjet, SerialsRJ-1 through RJ-65; Model 400A Beechjet,Serials RK-1 through RK-374.

SB 34-3642 Feb 2004 - O 34 Navigation - Collins FMS-6000 Version 2.2Upgrade






SB 34-3643 Feb 2004 - O 34 Navigation - Avionics Modification for UpdatedFlight Identification


SB 34-3650 Mar 2005 1 O 34 Navigation - Avionics Modification for UpdatedFlight Identification

400A, Beechjet, Serials RK-118, RK-140 throughRK-353; 400A, Hawker 400XP, Serials RK-354through RK-377.

SB 34-3651 Jan 2004 - R 34 NAVIGATION - ELIMINATION OF POSSIBLEERRONEOUS GLIDE SLOPE INDICATIONSON THE RNZ-850 INTEGRATED NAV UNIT

BAe.125 Series 800A, BAe.125 Series 800B,Hawker 800, Hawker 800XP and Hawker 1000, ifequipped with Honeywell RNZ-850 IntegratedNav Unit P/N 7510100-911 or 7510100-931.

SB 34-3655 Mar 2004 - R 34 Navigation - Update of FMS Vspeeds Database Hawker 800XP, Serials 258278, 258541, 258556and 258567 through 258669.

SB 34-3661 Jun 2004 1 R 34 Navigation - JAR AWO 268 Wiring Modificationof Radio Altimeter


SB 34-3672 Nov 2004 1 O 34 Navigation - Modification of air data computersto remove speed limitations

BAe. 125 Series 1000 and Hawker 1000.

SB 34-3695 Dec 2007 1 O 34 Navigation - Disablement of FL180 Alert This Service Bulletin has been revised toannounce that airplanes equipped with theIntegrated Flight Information System (IFIS) areexcluded from the Effectivity. Hawker 800XP,Serials 258541, 258556, 258567 and subsequentequipped with Collins Pro Line 21 avionics.

SB 34-3714 Mar 2005 - O 34 Navigation - Avionics modification for updatedflight identification

Honeywell Equipped Hawker 800XP, Serials258366 through 258540, 258542 through 258555and 258557 through 258566.

SB 34-3716 Apr 2006 - O 34 Navigation - Avionics Modification ForEnhanced Flight Identification

Raytheon Aircraft Model 400A Beechjet, SerialsRK-118, RK-140 through RK-353; RaytheonAircraft Model 400A Hawker 400XP, SerialsRK-354 through RK-417.

SB 34-3717 Apr 2006 - O 34 Navigation - Avionics Modification forEnhanced Flight Idendification

Hawker 800XP, Serials 258541, 258556, and258567 through 258716 equipped with RockwellCollins ProLine 21 Flight Management System(FMS) Software Version 2.2 or higher.

SB 34-3722 Jun 2006 1 O 34 Navigation - Collins FMS-6000 Version 3.0.3Upgrade from Version 2.2

Hawker 800XP, Serials 258541, 258556, 258567through 258669, 258670 through 258716 and258718 through 258722, if equipped with FMC822-0868-051.





SB 34-3750 Mar 2006 - O 34 Navigation - Collins FMS-6000 Version 2.2Upgrade with Weather Graphics CDU(S)

Hawker 800XP, Serial Numbers 258541, 258556,258567 through 258698, 258700 through258716,258718 through 258722 (if equipped withWeather Graphics CDU’(s) P/N 822-1485-102 perSTC ST10183SC).

SB 34-3752 Mar 2006 - O 34 Navigation - Avionics modification for updatedflight identification for Aircraft equipped withweather graphics CDU(S) (COLLINS PROLINE 21)

Hawker 800XP, Serial Numbers 258541, 258556and 258567 through 258669 (if ServiceBulletinNo. 34-3750 is accomplished prior to orconcurrent with accomplishment of this ServiceBulletin).





SB 34-3794 Dec 2006 1 O 34 Navigation - Redefinition and Identification ofRVSM Critical Area

BAe.125 Series 800A, BAe.125 Series 800B,Hawker 800 and Hawker 800XP equipped withHoneywell SPZ-8000 avionics with either Mod25F731A or Raytheon Aircraft Company ServiceBulletin 34-3110 embodied. BAe.125 Series800A, BAe.125 Series 800B, Hawker 800 andHawker 800XP equipped with Rockwell CollinsEFIS-86 avionics (with Collins ADC-86) witheither Modification 25F731B or Raytheon AircraftCompany Service Bulletin 34-3166 embodied.BAe.125 Series 800A and BAe.125 Series 800Bequipped with Rockwell Collins EFIS-85 avionics(with Collins ADC-82A) with Raytheon AircraftCompany Service Bulletin 34-3381 embodied.Hawker 800XP equipped with Collins ProLine 21avionics, Serials 258541, 258556, 258567 thru258586 with Raytheon Aircraft Company ServiceBulletin 34-3517 embodied and Serials 258587thru 258609, 258611 thru 258628, 258630 thru258684 and 258686 and subsequent. Hawker850XP equipped with Collins ProLine 21 avionics,Serials 258750 thru 258788, 258795 and 258802with Raytheon Aircraft Company Service Bulletin01-3776 (To Introduce the Conversion of Model800XP Aircraft to Model 850XP Aircraft)embodied and Serials 258789 thru 258794,258796, 258798 thru 258801, 258803 andsubsequent. BAe.125 Series 800A, BAe.125Series 800B and BAe.125 Series 800A (C-29A)equipped withRockwell Collins EFIS-85 avionics(with Collins ADC-82A) with Raytheon AircraftCompany Service Bulletin 34-3881 embodied.Hawker 800XP equipped with Collins ProLine 21avionics, Serials 258541, 258556, 258567thru258586 with Raytheon Aircraft CompanyService Bulletin 34-3517 embodied and Serials258587 thru 258609, 258611 thru 258628,258630 thru 258684 and 258686. Hawker 850XPequipped with Collins ProLine 21 avionics, Serials258750 thru 258788, 258795and 258802 withRaytheon Aircraft Company Service Bulletin01-3776 (To Introduce the Conversionof Model800XP Aircraft to Model 850XP Aircraft)embodied and Serials 258789 thru258794,258796, 258798 thru 258801, 258803and subsequent.





SB 34-38 Jan 1969 - O 34 To introduce improved CSI Pt. No.PW/202/AMA/6.

Series 3B, 3B/R, 3B/RA and 400B

SB 34-3821 Jun 2007 R 34 Navigation - Mode S Wiring Correction forEnhanced Surveillance

Hawker Beechcraft Model 400A Beechjet, SerialsRK-170, RK-270, RK-300, RK-309 and RK-318with Raytheon Aircraft Company (RAC) (currentlyHawker Beechcraft Corporation) Kit 128-3413installed per Optional Service Bulletin 34-3716.Hawker Beechcraft Model 400A (Hawker 400XP),Serials RK-418 through RK-511.

SB 34-3834 Oct 2007 - O 34 Navigation – Introduction of Honeywell EGPWSSoftware Enhancements with Optional RAASUpgrade

Hawker Beechcraft Model 400A Beechjet, SerialsRK-329 through RK-353; Hawker BeechcraftModel 400A (Hawker 400XP), Serials RK-354through RK-529. Airplane serial number RK-513meets the intent of this Service Bulletin and mayclaim Service Bulletin compliance with no furtheraction required.

SB 34-3836 Jun 2007 - O 34 Navigation - Collins FMS-6000 Version 3.3.1Software Upgrade from Version 3.0.3

Hawker 800XP and Hawker 850XP, Serials258541, 258556, 258567 through 258860, ifequipped with Collins Flight ManagementComputer (FMC) P/N 822-0868-069 (Collins FMSSoftware Version 3.0.3).

SB 34-3846 Nov 2007 1 R 34 Navigation - Transponder Modification Hawker Beechcraft Model 400A Beechjet, SerialsRK-1 through RK-353 equipped with TDR-94Mode-S Transponders, Rockwell Collins PartNumbers (P/Ns) 622-9352-004/-005/-007/-008 orTDR-94D Mode-S Transponders, RockwellCollins P/Ns 622-9210-004/-005/-007/-008;Hawker Beechcraft Model 400A (Hawker 400XP),Serials RK-354 through RK-529 equipped withTDR-94 Mode-S Transponders, Rockwell CollinsP/Ns 622-9352-004/-005/-007/-008 or TDR-94DMode-S Transponders, Rockwell Collins P/Ns622-9210-004/-005/-007/-008.

SB 34-3860 Jan 2008 - O 34 Navigation - Upgrade of the Rockwell CollinsGPS-4000A to a GPS-4000S

Hawker 800XP and Hawker 850XP, SerialNumbers 258541, 258556, 258567 andsubsequent; Hawker 900XP, Serial NumbersHA-1 through HA-43. If you are no longer inpossession of the airplane, please forward thisinformation to the present owner.

SB 34-3861 Oct 2008 - O 34 Navigation - Rockwell Collins GlobalPositioning System (GPS) Upgrade fromGPS-4000 or GPS-4000A to GPS-4000S

Beechjet Model 400A, Serials RK-118 andRK-140 through RK-353; Hawker 400XP, SerialsRK-354 through RK-547.





SB 34-3872 Mar 2008 - R 34 Navigation - Introduction of 900XP V-Speedand Performance Databases

Hawker 900XP, Serial Numbers HA-1 throughHA-56

SB 34-39 Oct 1969 1 R 34 Radio navigation. To introduce revisedsuppressed VOR/LOC aerials in fuselage nose.


SB 34-3901 Nov 2008 - O 34 Navigation - Mode S Enhanced SurveillanceTransponder Installations

Model 4000, Serials RC-7 through RC-29.

SB 34-4 May 1965 1 I 34 To provide structural provision for Sperry thinflux detector.

Series 1, 1A and 1B

SB 34-40 Feb 1969 - I 34 To introduce combined speed indicatorPW/202/AMA/4 in lieu of PW/202/AMA/1.

Series 3B, 3B/R, 3B/RA and 400B.

SB 34-41 Feb 1969 - I 34 To introduce Smiths Mod.02 to Turn and Slipindicator PW/1203 KTS/BR/1.

Series 1, 1A, 1A-522, 1A/S-522, 1B, 1B-522,1B/R-522, 1B/S-522, 3A, 3B, 3A/R, 3A/RA,3B/RA, 400A and 400B.

SB 34-42 Feb 1969 - I 34 Weather radar system. Modification to weatherradar power supplies.

Series 3B/RA (A/C 25162 165 to 168)

SB 34-43 Apr 1969 - I 34 To introduce Smiths Mod.01 to Mach Switch1402 KMB/CP/1.

Series 3A, 3A/R, 3A/RA and 400A

SB 34-44 Sep 1969 1 O 34 Introduction of suppressed ADF sense aerials. Series 1, 1A, 1A/522, 1A/S-522, 1B, 1B/522,1B/R-522, 1B/S-522, 3A, 3B, 3A/R, 3B/R, 3A/RAand 3B/RA.

SB 34-45 Mar 1972 1 O 34 Radio navigation. To introduce suppressedVOR/LOC aerials in fuselage nose in lieu ofexternal aerials on the fin.

Series 1 1A 1A-522 1A/S-522 1B 1B-5221B/S-522 1B/R-522 3A 3A/R 3A/RA 3B 3B/RA

SB 34-46 Oct 1970 1 I 34 To introduce Sperry Mod.H to CompassIndicator 1784460-656.

Series 3B (A/C 25015 062 069)

SB 34-47 Dec 1970 - O 34 Stall detector system. Static source transferedfrom S2 to S6.

Series 400A (A/C NA711 to 717)

SB 34-48 Aug 1969 - I 34 To introduce Smiths Mod.04 to Vertical speedindicator. (PW 104-RC1).

Series 3B, 3B/RA and 400B


Series 3, 3B/RA and 400B

SB 34-5 Dec 1970 1 O 34 Turn and Slip Indicator. To introduce SmithsMod.04 on KTS/0410/W Turn and SlipIndicator.







Series 3, 3B/RA and 400B

SB 34-51 Nov 1970 - R 34 Introducing modified gear to Servo AltimeterWL.704AM/FA/1. Smiths Mod.01.

All B Series A/C prior to 400 Pre Smiths Mod.01

SB 34-52 Oct 1970 - I 34 Mach / ASI. To introduce Smiths Mod.03. Model HS.125 series 1-521, 1B, 1B-522,1B/R-522, 1B/S-522, 3B, 3B/RA and 400B.

SB 34-53 Mar 1970 - R 34 To introduce altitude reporting from the ATCTransponder.


SB 34-54 Nov 1970 - R 34 VOR/LOC supressed aerial box. Deletion ofattachment bracket.

Model DH.125 and HS.125 - Series 400A and400B

SB 34-55 Dec 1970 - I 34 Servo altimeter. Addition of tag panels andcomponents.

Series 1B 3B

SB 34-56 Dec 1970 - I 34 Servo altimeters. Introduction of independentintegral bonding.

Series 1B 3B

SB 34-58 Dec 1970 - O 34 Servo altimeters. Reduction of possibility ofwarning flag sticking.

Series 1B 3B

SB 34-59 Jun 1971 1 I 34 VOR/LOC aerial. Improved sealing. Model DH.125 Series 1A, 1A-522, 1A/S-522, 3A,3AR, 3ARA. Model HS.125 Series 1, 1B, 1B-522,1B/R-522, 1B/S-522, 3B and 3BRA.

SB 34-6 Dec 1970 1 O 34 To introduce Smiths Mod.07 on altimeterKAA/1603/W1(Smiths SB34-99).

Series 1, 1A, 1B and 3B (A/C 25015)

SB 34-61 Dec 1970 - I 34 Servo altimeters. Improved method of mountingthe unit in the case.

Series 1B 3B

SB 34-62 Dec 1970 - I 34 Stall detector switch. To eliminate switchrejections during production flight testing.

Model DH.125 Series 1A, 1A-522, 1A/S-522, 3A,3AR, 3ARA and 400A. Model HS.125 Series 1,1B, 1B-522, 1B/R-522, 1B/S-522, 3B, 3BRA and400B.

SB 34-63 May 1971 - R 34 Mechanical counter pointer altimeterWL801/AM/CP/1. Counter gears with improvedsurface finish introduced.

Model HS.125 Series 3B/RA and 400B

SB 34-64 Mar 1971 - O 34 Servo altimeter WL704/AM/FA/1. Digitiserbridge dowelled to middle plate and shorterscrews at bearing bracket and pin assy.

Series 3B/RA and 400B





SB 34-65 Mar 1971 - I 34 Radio magnetic indicator PW16RNA/CP/2 andPW404RNA/CP/2. Replacement of obsoletediodes and rework of amplifier assembly.

Model HS.125 Series 1 and 1A

SB 34-66 Mar 1971 - I 34 Inverter FI48 for artificial horizon. STCcapacitors replace ERIE capacitors and toroidplate and components assembly to suit.


SB 34-67 Mar 1971 - R 34 Servo altimeter WL704AM/FA/1. Redesignedgear box and static connector.


SB 34-68 Mar 1971 - O 34 Mechancal counter pointer altimeterWL801AM/CP/1. New camshaft assemblyincreasing baroscale length.


SB 34-69 Mar 1971 - I 34 Servo altimeter WL704AM/FA/1 andWL707AM/FA/1. Improved method of mountingunit in case (Smiths Mod.10 SB34-327).

Model HS.125 Series 1

SB 34-7 Dec 1970 1 O 34 To introduce Smiths Mod.08 on altimeterKAA/1603/W1(Smiths SB34-93 rev1).


SB 34-70 Mar 1971 - R 34 Mechanical counter pointer altimeterWL801AM/CP/1. Baroscale counter replacedby re-designed all Delrin counter assy.

Series 3B/RA and 400B

SB 34-71 Jun 1971 - O 34 Servo altimeter WL704AM/FA/1 andWl707AM/FA/1. New camshaft with extendedcam and new cam follower introduced.

Model HS.125 Series 1, 1-521, 1B, 1B-522,1B/R-522, 1B/S-522, 3B, 3B/RA and 400B

SB 34-73 Aug 1971 - I 34 Indicating accelerometer KAE/0701/W.Re-designed ratchet springs and improvedmagnet to backplate adhesive.


SB 34-74 Aug 1971 - O 34 Servo altimeters PW150/AM/PC andWL160/AM/PC . Introduction of new rear coverincorporating modified static connector.

Model HS.125 Series 3B and B/RA

SB 34-75 Sep 1971 - I 34 Amplifier for servo altimeter. Additionalcapacitors in servo altimeter amplifier.

Model HS.125 Series 3B and 3B/RA

SB 34-76 Nov 1971 - I 34 Reduces possibility of interference betweengimbal frame clamp and gyro wheel shaftretaining plate of artificial horizon FH15G.


SB 34-77 Nov 1971 - I 34 Gyrosyn compass system. Slaving amplifier2585703 - addition of fuse to protect powertransformer.






SB 34-80 Nov 1971 - O 34 Compass system. Sperry thin flux valveSilicone rubber coating is added to obviate thepossibilty of corrosion.

Model HS.125 Series 3B and 3B/RA

SB 34-83 Nov 1972 - O 34 Introduction of three fixed levels of illuminationfor annunciator lights.

Model HS.125 Series 3BRA and 400B

SB 34-8A Dec 1970 1 O 34 To introduce Smiths Mod.04 on Mach/ASIswitch 0421/KMB/CP/1 (Smiths SB31-66).

Series 1, 1A, 1A-522,1B and 3B

SB 34-8B Dec 1970 1 O 34 To introduce Smiths Mod.04 on Mach/ASIswitch 0423/KMB/CP/1 (Smiths SB31-66).

Series 1, 1A, 1A-522, 1B and 3B

SB 34-9 Apr 1965 - O 34 To introduce mechanism Mod.CN3961 onAltitude Warning Unit M2019 (Mechanism Modleaflet 102).

Series 1, 1A and 1B

SB 34-A134 Apr 1978 - M 34 RCA AVQ21 and Primus 40 Weather rader.Defective mounting tray.

HS.125 Series 403, 600 and 700.





ATA Chapter 35Oxygen

SB 35-1 Nov 1970 1 I 35 Introduction of barometric control valveWKA28790/3.

Series 1, 1A, 1A-522, 1A/S-522, 1B, 1B-522,1B/S-522, 1B/R-522, 3A, 3B and 3B/RA

SB 35-10 Mar 1968 - O 35 To provide a filter in the oxygen systemdownstream of the oxygen bottle to protect thepressure regulator.


SB 35-11 Jul 1968 2 R 35 To introduce oxygen regulators ARO 15830E inplace of Scott regulators 10400-13.

Series 1B and 3B (see Description)

SB 35-12 Jun 1978 2 O 35 To introduce Walter Kidde Mod.6334 to oxygencylinders (WK SB35-46).

Series 1, 1A, 1A/522, 1A/S-522, 1B, 1B/522,1B/R-522, 1B/S-522, 3A, 3B, 3A/R, 3A/RA and3B/RA

SB 35-13 Jan 1969 - I 35 To introduce DAMIC oxygen shut off valve. PtsA B - SDV 826 to replace SDV 543 Pt C - SDV920 to replace SDV 633.


SB 35-14 Oct 1970 1 O 35 Pressure regulator WKA 29720. To introducefilter (Walter Kidde Mod.6430 SB 35-48).

Series 1, 1A, 1A-522, 1A/S-522, 1B, 1B-522,1B/R-522, 1B/S-522, 3A, 3AR, 3ARA, 3B, 3BRA,400A and 400B

SB 35-15 Nov 1970 - I 35 Shut off valve. To introduce SDV 826/1 in lieuof SDV 826.

Model DH.125, Series 1A, 1A-522, 1A/S-522, 3A,3AR and 3ARA. Model HS.125, Series 1 ,1B,1B-522, 1B/R-522, 1B/S-522, 3B and 3BRA

SB 35-16 Jan 1974 2 R 35 To introduce oxygen bottles in rear fuselage inlieu of nose mounted bottles.

Model DH.125, Series 400A. Model HS.125,Series 400B

SB 35-16 - INSP Mar 1973 - R 35 Third oxygen cylinder. Insufficient clearance atrudder control cable.


SB 35-17 May 1971 - I 35 Duplex drop-out mask unit WKA 29607 andWKA 33357. Flow indicator WKA 30339replaces WKA 27166.

Model HS.125, Series 1, 1-521, 1B, 1B-522,1B/R-522, 1B/S-522, 3B, 3BRA and 400B

SB 35-18 Apr 1971 - R 35 Hose connecting toilet oxygen drop-out unit tocabin system. New hose of improved material.

Model HS.125, Series 3B/RA and 400B

SB 35-19 Mar 1972 - R 35 Storage cylinders. Suspected contamination. Applicable to HS/BH 125 aircraft, Series 400Aand 400B





SB 35-2 Nov 1970 1 O 35 Damic supply valve. To introduce valveSDV543/1 in lieu of SDV543.


SB 35-20 Jun 1972 - O 35 To prevent the oxygen screen tube at the bottleconnections being locally overheated afibreglass guard is fitted.


SB 35-21 Oct 1980 1 O 35 Oxygen - Master supply valve SDV826/1replaced by Walter Kidde valve WKA35831 atmaster and cabin supply - piping altered to suit


SB 35-23 Mar 1977 3 R 35 Fuel & APU. To aviod contamination of theoxygen charging panel.

Model BH.125 Series 400A and 600A. ModelHS.125 400B, 401B, 403B and 600B.

SB 35-24 Aug 1974 - O 35 Bottle installation. A stop block is introduced toreduce the possibility of rudder bias pipesfretting the RH main oxygen bottle.

Model BH 125, Series 400A and 600A. Model HS125, 400B, 401B, 403B and 600B

SB 35-26 - 256987 Apr 1984 5 I 35 To introduce third oxygen bottle (750 litre) andpiping.

All Series 700 and variants

SB 35-27 May 1979 - M 35 Oxygen - Pressure regulator WKA 29720.Possible contamination of spares items.

Applicable to items held as spare or in store for allHS/DH/BH 125 Series aircraft

SB 35-28 Mar 1982 2 I 35 Cylinder WKA37447 replaces WKA 31393.Stop block for RH main cylinder modified tosuit.

Model HS/BH/B.A.e 125, Series 600, 700 and allvariants

SB 35-29 Feb 1980 - M 35 Master valve SDV826 series. leakageInstances have occurred of master valve highflow internal leakage due to seal deterioration.

Applicable to all HS/DH/BH 125 aircraftpre-modification 252239, Series 1, 1-521, 1-522,1A, 1A-522, 1A/S-522, 1B, 1B-522, 1B/R-522,1B/S-522, 3A, 3A/R, 3A/RA, 3B, 3B/RA, 3B/RC,F-3B, F-3B/R, 400A, 403A (C), 400B, 403B,F-400B, 600B and F-600B

SB 35-3 Nov 1970 1 R 35 Introduction of Walter Kidde socketWKA30912/1 (Mod.6167).

Series 1, 1A, 1A-522, 1A/S-522, 1B, 1B/S-522,1B/R-522, 3A and 3B

SB 35-30 Dec 1980 - O 35 Oxygen - To introduce a replacement oxygencontents gauge

Model DH/HS 125, Series 1, 3 and all variants.Model HS/BH 125, Series 400, 401, 403, 600 andall variants.





SB 35-3014 Sep 1997 - M 35 Inspection of passenger oxygen face mask forpossible tears in face cushion.

Airplanes with Puritan-Bennet C351-2000 seriespassenger oxygen face masks installed bearingan elastomer cure date of the first or secondquarter of 1994

SB 35-3034 Dec 2000 1 M 35 Oxygen - To introduce replacement oxygenfittings in lieu of fittings incompatible with theoxygen system

BAe 125 Series 800A/B, Hawker 800 and Hawker800XP Serials 258266, 258277 through 258290which are Pre Mod. 258497, 258895A, 258980A,or 259120A and Pre Mod. 253596A.

SB 35-31 Dec 1980 - R 35 To introduce modified feed pipe at flight deckoxygen socket.


SB 35-3115 Dec 1998 - O 35 Oxygen - Introduction of replacementPuritan-Bennett crew oxygen masks

DH/BH/HS/BAe 125 Series 3A/3B, 400A/400B,600A/600B, 700A and 700B which are Pre-Mod.252678 and Post-Mod. 256140.

SB 35-3167 Sep 1998 - M 35 To introduce replacement oxygen fittings in lieuof fittings incompatible with the oxygen system

All BAe 125 Series 1000A, 1000B and Hawker1000 which are Pre Mod. 253357B (Introductionof third oxygen bottle).

SB 35-3168 Sep 1998 - M 35 To introduce replacement oxygen fittings in lieuof fittings incompatible with the oxygen system

All BAe 125 Series 1000A, 1000B and Hawker1000 which are Post Mod. 253357B (Introductionof third oxygen bottle).

SB 35-3169 Sep 1998 - M 35 Oxygen - To introduce replacement oxygenfittings in lieu of fittings incompatible with theoxygen system

All DH/BH/HS/Bae 125 series 1A/1B, 3A/3B,400A/400B, 600A/600B and 700A/700B

SB 35-3170 Dec 2000 - M 35 Oxygen - To introduce replacement oxygenfitting in lieu of fitting incompatible with theoxygen system

BAe 125 Series 800A/B, Hawker 800 and Hawker800XP

SB 35-3171 Sep 1998 - M 35 Oxygen - To introduce replacement oxygenfittings in lieu of fitting incompatible with theoxygen system

All BAe 125 Series 800 (C29A)

SB 35-32 Nov 1981 - O 35 Crew. To introduce Eros oxygen mask andstowage.

Model HS/B.Ae.125, Series 700B and 700A

SB 35-33 Jul 1985 - I 35 Oxygen - Crew oxygen mask - Possibleinsecurity of mask harness assembly

Applicable to all HS/BAe 125 aircraft

SB 35-3316 Jun 2000 1 O 35 Oxygen - Replacement oxygen contentsgauges in the flight compartment and theoxygen charging box

BAe 125 Series 800 (including Major VariantsC-29A and U-125). Hawker 800 (including majorvariant U-125A, (JASDF)) prior to 258407.Hawker800XP, Serials prior to 258396.





SB 35-34 Aug 1989 - R 35 Oxygen - Passenger/therapeutic masks -Introduction of new headstraps

All Series with Walter Kidde Passenger MaskAssembly Pt. No. K38003





SB 35-3495 Dec 2002 1 M 35 Oxygen Introduction of Scott ProtectiveBreathing Equipment (PBE)

256025, 256026, 256040, 256046,256047;256055, 256060, 256066 thru256069;257005, 257006, 257011, 257014,257019, 257024, 257029, 257033, 257036,257038, 257039, 257042, 257044, 257048,257049, 257052, 257057, 257059, 257060,257065, 257068, 257069, 257071, 257074,257075, 257077, 257078, 257081, 257083,257084, 257086, 257090, 257095, 257098,257101, 257104, 257106, 257111, 257113,257114, 257116, 257117, 257119, 257120,257122, 257123, 257125, 257128, 257129,257131, 257134, 257135, 257137, 257140,257141, 257144, 257147, 257148, 257150,257152, 257154 thru 257158, 257161, 257162,257165, 257168, 257170, 257171, 257173,257174, 257176, 257177, 257180, 257182,257188, 257191 thru 257193, 257195, 257198,257199, 257201, 257202, 257204, 257206,257207; 258004 thru 258009, 258011, 258012,258018, 258020, 258023, 258024, 258027,258030, 258032, 258035, 258036, 258039,258041, 258042, 258044 thru 258047, 258049,258051 thru 258055, 258057, 258059 thru258063, 258065, 258066, 258069, 258070 thru258072, 258075, 258080 thru 258084, 258086,258089, 258090, 258092, 258093, 258095,258096, 258098 thru 258104, 258108, 258113,258114, 258117, 258119, thru 258128, 258132,258135 thru 258142, 258144, 258145, 258147,258150, 258152, 258153, 258155, 258157,258160, 258162, 258163, 258168, 258169,258170 thru 258176, 258178,258179, 258181,258183, 258185, 258187 thru 258189, 258193,258195, 258196, 258200, 258202 thru 258204,258206, 258209, 258214, 258221, 258223,258225, 258228, 258230, 258231, 258234,258239, 258241, 258244, 258246, 258248,258249 and 258251 thru 258254;258255 thru258265, 258267 and 258269 thru258276;258266, 258277, 258278 thru 258304,258307 thru 258324, 258326 thru 258332,258334 thru 258340, 258344, 258345, 258347,258349, 258354 thru 258356, 258358, 258359,258361 thru 258369, 258371 thru 258380,258382 thru 258406, 258408 thru 258426,258428 thru 258444, 258446 thru 258468,258470 thru 258492 and 258494 thru 258511.





SB 35-35 Dec 1997 2 O 35 Oxygen - Barometric valve - Introduction of analternative barometric valve permittingoperation into high altitude airfields

BAe 125 800A, 800B a/c 258091 and subs.Hawker 800, 800XP

SB 35-3567 Mar 2003 - O 35 OXYGEN - Oxygen Servicing GaugeReplacement

BAe.125 Series 1000A; BAe.125 Series 1000Band Hawker 1000.

SB 35-36 Jan 1993 - M 35 Oxygen System - Inspection of oxygen pipe forpossible damage caused by nose wheelsteering control chain operation

Applicable to BAe 125 Series 1000 aircraft

SB 35-3692 Feb 2005 - O 35 Oxygen - Replacement of Oxygen Gage BH.125 Series 600A; HS.125 Series 600A, 600B,600B/1, 600B/2, 600B/3 and F600B; HS.125Series 700A and 700B.

SB 35-37 May 1992 - O 35 Introduction of third 750 litre oxygen bottle andpiping.

Series 800 ( 258216 and 258217)

SB 35-3886 Jul 2008 1 M 35 Oxygen - Replacement of Burst Disc Assemblyin P/N WKA27942 Series Filter Assemblies

BH.125 Series 400A; DH.125 Series 400A;HS.125 Series 400B; HS.125 Series 400B/1;HS.125 Series 401B; HS.125 Series 403A(C);HS.125 Series 403B; HS.125 Series F400B andHS.125 Series F403B, post Mod 252036 or postService Bulletin 35-16, if burst disc assembly P/NWKA30773 was purchased after June 1, 2006;BH.125 Series 600A; HS.125 Series 600A;HS.125 Series 600B; HS.125 Series 600B/1;HS.125 Series 600B/2; HS.125 Series 600B/3;HS.125 Series F600B; HS.125 Series 700A;HS.125 Series 700B; BAe.125 Series 800A;BAe.125 Series 800B; Hawker 800 (includingvariants); Hawker 800XP and Hawker 850XP, ifburst disc assembly WKA30773 was purchasedafter June 1, 2006; Hawker 800XP and Hawker850XP, Serial Numbers 258800 through 258901;Hawker 800 (U-125A), Serial Number 258735;Hawker 900XP, Serial Numbers HA-0001 throughHA-0048.

SB 35-39 Jun 1993 1 R 35 Flight Deck - Introduction of Eros Crew Maskwith new Mask Lock.

Series 700 and 800 Mod.252678 PreMod.257634A

SB 35-4 Dec 1970 1 O 35 Crew mask. To introduce Walter Kidde oxygenmask WKA31422/1 in lieu of WKA31422. (WKAMod.6148 SB 35-34-6148).

Series 1, 1A, 1B, 1B/S-522 and 1B/R-522





SB 35-40 Feb 1994 - I 35 Control unit. Introduction of an alternativecontrol unit to permit operation of the aircraft upto an airfield altitude of 10,000 feet.


SB 35-43 Feb 1996 - M 35 Restricted - See Remarks Hawker 800 - U125A

SB 35-45 Sep 1996 - M 35 Oxygen system - Inspection of aircraft oxygencylinders, hoses, regulators, panels, valves andmasks for serviceability

Applicable to all DH/BH/HS/BAe 125 Series1A/1B, 3A/3B, 400A/400B, 600A/600B,700A/700B; 800A/800B/Hawker 800 including XPand Major Variants C29A, U125, U125A; 1000,1000B and Hawker 1000.

SB 35-46 Sep 1996 - M 35 Oxygen System - Inspection of oxygen systemfor possible installation of unqualified flexiblehoses

Applicable to all DH, BH, HS and BAe 125 Series400A/400B, 600A/600B, 700A/700B;800A/800B/Hawker 800 including 800XP andmajor variants C29A, U125, U125A.

SB 35-5 Jan 1967 - O 35 Passenger. To introduce an oxygen systemcleared for use at 41000 feet.

Series 1A and 3A

SB 35-6 Jan 1967 - R 35 Standard oxygen system. To re-introduceWalter Kidde pressure reducing valveWKA29720 in place of Normalair OP7580.

Series 1A, 1B, 3A and 3B aircraft embodyingModification 251630.

SB 35-7 Feb 1967 - R 35 Supply Master Valve and Passenger SupplyIsolation Valve. Possibility of incorrectinstallation.

Applicable to H.S.125 aircraft, all series

SB 35-9 May 1967 1 R 35 Co-pilots supply. Mask hose fouling against RHsliding window panel 'B'.

Series 1A 1B 3A 3B (A/C 25096 to 126 except113 117 120 125)

SB 35-A22 Jul 1973 1 M 35 Storage cylinders. WKA 29396/GR14 WKA29396/GR22 WKA 31393 WKA 31394 Metalstamping of overhaul dates on cylinder surface.

Applicable to HS/DH/BH 125 aircraft Series 1, 1A,3A, 3B, 400A, 400B and all variants, 600A and600B, ftted with overhauled oxygen cylinders

SB 35-A25 Oct 1977 - M 35 Supply valve. Insecurity of thread insert ingland bush.

Applicable to HS/DH/BH 125 aircraft, all seriesexcept Series 600 and Series 700





ATA Chapter 38Water/Waste

SB 38-1 Nov 1972 - O 38 Flushing toilet M877 variants. To introduceParts A & C Retrospective conversion tobellows operated flush.

Model HS.125 Series 1A/S-522, 3B, 3B/RA and400B.

SB 38-10 Feb 1978 2 I 38 Wash water pump (Delux toilet). ExistingKarvan 400-00 pump unit is replaced by aT2-24 type pump and PM-1 pressure monitor.

Model HS 125, Series 600B and 700B

SB 38-11 Oct 1979 - I 38 Toilet wash water pump. CCC type T2-12Spump replaces type T2-24 or Karvan type400-00 pump.

Model HS.125, Series 700A and 600B

SB 38-12 Nov 1983 1 I 38 To introduce new wash water pump Shurflo1020-814-12 in lieu of T2-12S (CCC) withmonitor.

Model HS 125, Series 600B and 700B

SB 38-13 May 1987 - R 38 Water/waste - General - Introduction of toiletwashbasin overflow drain

Model HS.125 Series 1B, 3B, 400B and 600B

SB 38-14 Jul 1988 - I 38 Water/waste - Wash - Modification of HermanSmith water heater part no. H0800, H0800 -Mod.1, HE71001 and HE71005

All Series with Herman Smith water heaters Pt.No. H0800, H0800 Mod.1, HE71001 andHE71005.

SB 38-16 Jun 1994 - R 38 To introduce additional protection forequipment installed under left galley.

BAe 125 Series 1000B

SB 38-18 Nov 1994 - O 38 To increase the capacity and efficiency of theToilet.

BAe 125 Series 1000A, 1000B and Hawker 1000aircraft

SB 38-19 Feb 1996 2 R 38 Water Waste - Introduction of revised routing ofthe vanity unit catchment tray drain line outletfrom Frame 15 to Frame 16

BAe 125 Series 800A, 800B and Hawker 800Post Mod. 25A013A or Post Mod. 25A059B or C

SB 38-2 Jan 1974 - R 38 Toilet flushing switch. Possibility of switchbutton jamming in 'ON' position.

Series 600B (A/C 256015 017 019 021 024 027028 030)

SB 38-3123 Nov 1997 - O 38 Water/Waste. introduction of new brass sink toreplace the existing aluminum sink.

BAe 125 Series 1000A and Hawker 1000

SB 38-8 Mar 1976 - O 38 Toilet compartment cold & waste water system.Mechanically operated valves replace hydraulicto improve reliability.






SB 38-9 May 1976 - O 38 Galley sink overboard drain. Mechanical valvereplaces hydraulic valve and diameter of drainis increased.

Model H.S.125, Series 600B

SB 38-A4 Jun 1974 - R 38 Electrical flushing toilet. On completion of theflushing cycle instances have occured of thepump motor continuing to run.

Applicable to HS 125 aircraft Series 600B





ATA Chapter 44Cabin Systems

SB 44-3565 Dec 2002 - M 44 Cabin Systems - Deactivation/Modification ofCabin Entertainment System

Hawker 800XP, Serial Numbers 258377, 258391,258396 through 258400, 258402 through 258406,258408 through 258420, 258422 through 258426,258428 through 258433, 258435 through 258443,258446, 258448 through 258468, 258470 through258492, 258494 through 258512, 258514 through258532 and 258534 through 258603.

SB 44-3597 Apr 2003 - O 44 Cabin Systems - Time-to-Destination (TTD)and Destination Identification (ID) in theAirshow or GENESYS Display Modification

Hawker 800XP, Serials (equipped with Airshow400) 258570, 258571, 258573 through 258579,258582 through 258601, 258603 through 258609,258611, 258612 and 258614. Hawker 800XP,Serials (equipped with Airshow Genesys) 258541,258556, 258567 through 258569, 258572,258580, 258581, 258602 and 258613.

SB 44-3773 Apr 2007 - O 44 Equipment/Furnishings – Dual DVD PlayerInstallation

Hawker 800XP and Hawker 850XP, SerialNumbers 258725, 258730, 258732, 258734,258741, 258743, 258746, 258756, 258760,258763 and 258766, if equipped with STCST10385SC.





ATA Chapter 46Information Systems

SB 46-3785 May 2006 - O 46 Information Systems - Upgrade of FSA-5000Software

Model 390 Premier I, Serials RB-102, RB-135through RB-156.

SB 46-3786 Apr 2006 - O 46 Information Systems - Upgrade to FSA-5000Software

Hawker 800XP, Serials 258699, and 258744through 258781 (Kit No. 140-1702 not installed);Hawker 850XP, Serials 258750 through 258781(Kit No. 140-1702 installed).

SB 46-3792 Jun 2007 O 46 Information Systems – Upgrade to FSA-5000Software

Hawker 800XP, Serial Numbers 258644, 258684,258688, 258701, 258711, 258715, 258717, and258723 through 258743, if modified by STCST01342WI.

SB 46-3817 Feb 2007 - R 46 Information Systems - Integrated FlightInformation System (IFIS) Wire HarnessChafing Inspection/Repair

Hawker 800XP and Hawker 850XP, Serials258699 and 258744 through 258796, 258798 and258799





ATA Chapter 49Airborne Auxiliary Power

SB 49-1 Oct 1967 - I 49 To introduce new items of ground equipment. Series 1A, 1B, 3A, 3A/R, 3B and 3B/R

SB 49-10 Oct 1970 1 I 49 To introduce AiResearch Mod.14 to APU gasturbine engine 380302-1 prior to Serial No28865.

Series 1A, 1A-522, 1A/S-522, 1B/S-522 (A/C25097), 3A, 3A/R, 3A/RA, 3B, 3B/RA (less A/C25154, 25157 and 25169), 400A and 400B

SB 49-11 Dec 1969 - O 49 Introduces uprated fuses and circuit breakersfor APU master & fuel pump. (Mod.25606).

Model HS 125, Series 1B/S-522, 3B and 3BRA.Model HS 125, Series 3BRA and 400B

SB 49-12 May 1970 - O 49 Introduces improved protective boot at APUexhaust door struts.

Model HS.125 Series 1B/S-522, 3B, 3B/RA and400B

SB 49-13 Aug 1970 - R 49 Gear case breather pipe connector. Replacedby counter bored connector

Model HS 125, Series 1B/S-522, 3B, 3BRA and400B

SB 49-14 Dec 1970 - R 49 380302-1. Replacement of bearings and oil jet(AiResearch Mod.11).


SB 49-15 Dec 1970 - O 49 380302-1. Replacement of acceleration controlthermostat.


SB 49-16 Dec 1970 - R 49 380302-1. Introducing new valve & packingsinto the Oil Pressure Regulator 354972-3(AiResearch Mod.18).


SB 49-17 Mar 1971 - I 49 GTCP 30-92 PtNo 380302-1 -interchangeability standard. (Air Research 092Mod.056 sheets 1 and 2).


SB 49-18 Apr 1971 - I 49 Provision of blanks & stowing facilities to permitaircraft to fly without the APU.

Aircraft affected are B Series equiped with A.P.U.i.e. post mod. 251605

SB 49-19 Jun 1971 - R 49 Gas turbine engine GTCP 30-92 (380302-1).Dispensable oil filter replaces re-usable metalicfilter (AirResearch SB49-1974).

Model HS.125, Series 1B/S-522, 3B, 3BRA and400B

SB 49-2 May 1968 - R 49 To re-route the gearbox breather pipeseparately from the drain system to easemaintenance.

Series 1B/S-522 and 3B (Post Mod. 251605)

SB 49-20 Dec 1971 - I 49 Gas turbine engine GTCP 30-92. To improvethe centre bearing sealing and gearboxventing.






SB 49-23 Aug 1981 5 M 49 Airborne auxiliary power - Introduction of a 275amp airfuse for A.P.U. start circuit protection

Model HS/BH 125, Series 1, 3, 400, 401, 403 andall variants. Model HS/BH 125, Series 600 (postmod. 251605) and all variants.

SB 49-25 Feb 1978 4 O 49 Introduces improved operation of APU inlet andexhaust doors.

Model DH.125, Series 1A/S-522 and 600A. ModelHS.125, Series 3B, 3BRA, 3BRC, 400B, 403Band 600B.

SB 49-26 Mar 1979 1 O 49 To introduce a remote located APU oil filterwith improved accessibility

Model DH.125, Series 1A/S-522, 600A and 700A.Model HS.125, Series 3B, 3BRA, 3BRC, 400B,403B, 600B and 700B.

SB 49-27 Jan 1978 - R 49 Cowlings. Possible malalignment between APUand aspirator.

Applicable to HS 125 Series 700A aircraft withMods. 251605 and/or 256817 and/or 258015, andto HS 125 Series 700B

SB 49-28 Jun 1979 2 M 49 Airborne Auxiliary Power - Mounting - Toimprove local attachment of the lower mountingto the main engine beam

Model DH/HS.125 Ssries 1, 3 and all variants.Model HS/BH.125, Series 400, 401, 403, 600 andall variants. Model HS.125, Series 700 and allvariants.

SB 49-29 Jun 1979 1 O 49 A.P.U. - To introduce a modified exhaustsystem and revised forward and aft trus sidemounts

Model DH/HS.125, Series 1, 3 and all variants.Model HS/BH.125, 400, 401, 403, 600 and allvariants. Model HS.125, Series 700 and allvariants.

SB 49-3 May 1968 - O 49 Cowlings. Re-alignment of APU doors actuatorbracket assemblies.

Series 3B (Aircraft embodying Mod No. 251605only)

SB 49-30 Mar 1984 - O 49 Airborne auxiliary power - Engine - Remove oilfilter with repositioned hoses

All Series B Mod.251605 and 257529 (up to andincluding Series 700B 257172)

SB 49-3018 Aug 1997 - M 49 Auxiliary Power - Inspection of auxiliary powerunit (APU) fuel feed hose assemblies forpossible collapse of inner casing andreplacement with new

Hawker 800XP

SB 49-31 Dec 1986 2 M 49 Airborne auxiliary power - Sealing of theplenum shroud

All DH/HS/BH/B.Ae.125 Series Aircraft up to andincluding Aircraft 258030 post mod. 251605 or258748

SB 49-32 Mar 1986 1 M 49 Airborne auxiliary power - Introduces an APUto aircraft structure bonding link

All DH/HS/BH/B.Ae. 125 Series Aircraft up to andincluding Aircraft 258034 fitted with an auxiliarypower unit to mod. 251605 or 258748.

SB 49-3254 Nov 1998 - O 49 Airborne Auxiliary Power - Introduction of newcontactor on Panel 'ZK-A'

BAe 125 Series 800 Post Mod. 259404B(Introduction of Turbomach APU)





SB 49-3261 May 2007 - M 49 Airborne Auxiliary Power -Inspection/Replacement of APU Mount Fittings

Hawker 800XP with PATS, Inc. APU Kit installedunder STC No. ST00459NY with investment castAPU Mount Fittings, Airplane Serial Numbers258355, 258356, 258358, 258359, 258361through 258369, 258371 through 258373,258375, 258376, and 258382.

SB 49-33 Mar 1987 - R 49 Airborne Auxiliary Power - Centre instrumentpanel 'CC' - Introduction of APU controlindication

Series 700B, 800A and 800B

SB 49-3322 Nov 1999 - O 49 Airborne Auxiliary Power - Replacement of theauxiliary power unit (APU) Exhaust Heatshield

Hawker 800 and 800XP

SB 49-3346 Feb 2000 - R 49 Airborne Auxiliary Power - Control Panel -Exhaust Gas Temperature (EGT) IndicatorModification

Hawker 800XP

SB 49-3361 Oct 1999 - O 49 Restricted - See Remarks Hawker 800 (U-125A) JASDF, Serials 258245,258247, 258250, 258268, 258288, 258305,258306, 258325, 258333 and 258341.

SB 49-34 Mar 1990 - R 49 Airborne Auxiliary Power - Panel DE -Introduction of switch guard for the APU startswitch

Series 800 with Turbomach A.P.U. (BAe. Mod.259404B)

SB 49-37 Oct 1991 - M 49 Airborne Auxiliary Power - Ignition/Starting - ToProvide fuse protection to battery supplies indebris zone


SB 49-38 Jan 1993 - O 49 Auxiliary Power Unit - Cross Start - Introductionof revised electrical circuits for auxiliary powerunit assisted start

Series 1000

SB 49-3819 Feb 2007 - O 49 Airborne Auxiliary Power - APU Gearbox DrainModification

Hawker 800XP/850XP Serials, 258289,258292through 258294, 258299,258311, 258313 through258809 equipped with Honeywell GTCP36-150WAPU, not including Hawker 800(U-125A).

SB 49-39 Apr 1993 1 O 49 Cancelled SB - Auxiliary Power Unit - ElectricalInstallation - Introduction of twin battery startingfor Turbomach APU

Series 800 Mod.259404B

SB 49-4 Feb 1969 - I 49 Introduction of AiResearch Mod.10 to APU. Series 1A, 1A-522, 1B/S-522, 3A, 3B, 3A/R,3A/RA, 3B/RA, 400A and 400B

SB 49-40 Jun 1992 - O 49 Airborne Auxiliary Power - Introduction ofTurbomach auxiliary power unit

Series 1000A





SB 49-41 Apr 1993 - R 49 Auxiliary Power Unit - Electrical Installation -Removal of twin battery starting for turbomachauxiliary power unit

Series 800 Post Mod.259890A 259404B (ThisMod. is only applicable to A/C which haveMod.259890A embodied)

SB 49-42 Oct 1993 - R 49 Auxiliary Power Unit - Electrical installation -Revision to Turbomach APU starting circuitry

Series 800 which are Post Mod.259890A andPost Mod. 259404B

SB 49-44 Jun 1995 1 M 49 Inspection of APU fuel feed hose assembliesfor clearance with adjacent LH mixervalve/main air valve assemblies and for signsof overheating.

Applicable to all BAe 125-1000A, B and Hawker1000 aircraft Post Mod 259722C

SB 49-45 May 1995 - M 49 Auxiliary Power - Inspection of APU fuel feedhose assemblies for clearance with adjacentLH mixer valve/main air valve assemblies andfor signs of overheating

All Series 800 Fitted with Turbomach APU PostMod 259404B (A/C 258091 and on)

SB 49-47 Aug 1995 - R 49 Introduction of improved standard of conduit forthe auxiliary power unit (APU) fuel feed hose.

BAe 125 Series 800A, 800B and Hawker 800 PreMod. 25A825B and Post Mod. 259404B.

SB 49-48 Jul 1996 1 O 49 Electronic sequence unit. To introduce anincreased overtemperature shutdown setpointfor in-service evaluation.

Series 1000 (259005)

SB 49-5 Mar 1969 1 I 49 Introducing Smiths Mod.03 to RPM indicatorsPt A - KTD 0704W Pt B - PW1 -0708/KTD/CP/1.

Series 1A, 1A-522, 1A/S-522, 1B, 1B-522,1B/S-522, 1B/R-522, 3A, 3B, 3A/R, 3A/RA,3B/RA, 400A and 400B

SB 49-6 Feb 1969 - I 49 Introducing AiResearch Mod.9 to APU gasturbine engine 380302-1 (SB 49 1212 Rev 1).

Series 1A, 1A-522, 1A/S-522, 1B/S-522, 3A,3A/RA, 3B, 3B/RA, 400A and 400B

SB 49-7 Feb 1969 - I 49 Introducing AiResearch Mod 8 to APU gasturbine engine 380302-1.

Series 1A-522, 1A/S-522, 1B/S-522, 3A, 3B,3A/R, 3A/RA, 3B/RA, 400A and 400B

SB 49-8 Apr 1969 - O 49 To introduce an increased diameter gear casebreather pipe.

Series 1B/S-522, 3B, 3B/RA (Post Mod. 251605)

SB 49-9 Oct 1970 1 I 49 To introduce AiResearch Mod.13 to APU gasturbine engine 380302-1 prior to Serial No28859.

Pneumatic and Shaft Power Gas Turbine EnginePart No. 380302-1-1, Series 1 through 9.





ATA Chapter 51Standard Practices and Structures - General

SB 51-1 Jul 1966 - O 51 Wing fairing attachment. To introduce bolts inlieu of rivets at attachment plates for sidefairings.


SB 51-2 Mar 1973 - R 51 Flight plans. Relationship of operators flightplans to those used by HSA for airframe fatigueappraisal.

Applicable to HS/DH/BH 125 aircraft, all series

SB 51-3 Feb 1987 - M 51 Structures - General - Introduction of additionalinspection requirements

Applicable to HS 125 aircraft

SB 51-3336 Jan 2001 1 M 51 Structures - Inspection for/installation ofpossible missing rivets between Frame 10Aand Frame 12

Hawker 800XP

SB 51-3408 Oct 2000 - M 51 Structures General - Inspection AndReplacement Of Suspect DHS RavenstoneJackson Bolts

Hawker 800XP

SB 51-3421 Nov 2001 1 M 51 Restricted - See Remarks Group A: All of the wing bolt locations andfuselage bolt locations described in this ServiceBulletin must be inspected on the followingairplanes: Hawker 800 U-125A Serials 258305,258306, 258325, 258333 and 258341. Group B:The #3, #31, #37, #38, #52, #5

SB 51-3426 Nov 2001 1 M 51 Structures General - Inspection andreplacement of suspect DHS RavenstoneJackson bolts

Hawker 800XP Serials 258345 through 258347,258349 through 258359, 258361 through 258369,258371 through 258380 and 258382 through258390. Hawker 800XP Serial Number 258390

SB 51-4 May 1989 - M 51 Structures - Fuselage - Possible corrosioncracking in forward keel skin panels

Applicable to all BH/DH/HS/BAe 125 aircraft up toand including Series 600





ATA Chapter 52Doors

SB 52-1 Dec 1964 - O 52 To introduce entry door guide blocks Series 1, 1A and 1B

SB 52-10 Jun 1966 - R 52 Entry door. To introduce the additional wording'PUSH IN AND LIFT' on the main entry doorexternal handle.


SB 52-11 Jun 1966 - O 52 Entry door balance mechanism. To introduceimproved stowage bracket & hook for bungee.


SB 52-12 Oct 1966 - O 52 Entry door. Introduction of modified bushes inthe entry door balance return hook assembly.


SB 52-13 Oct 1966 - R 52 Emergency exit. To introduce a support washeron four bolts which attach two mountingbrackets at the bottom of the escape hatch.


SB 52-14 Mar 1967 - I 52 Entry door. To introduce Wilmot Breedon doorlock L3416/FS955 as an alternative to FA600.


SB 52-16 Apr 1969 - I 52 To ensure positive engagement of outwardopening door external handle lock.

Series 400A - 400B

SB 52-17 Feb 1970 2 I 52 To introduce wider interlock barrel and torqueshaft lever for outward opening door operatingmechanism.


SB 52-18 Dec 1970 1 I 52 To ensure adequate lift on outward openingdoor.


SB 52-19 Dec 1981 4 O 52 Entry door. To introduce improvements to theoutward opening door and mechanism.


SB 52-20 Nov 1970 2 R 52 Outward opening door , to improve attachmentof tensator motor drum to drive shaft.

Model DH 125, Series 400A. Model HS 125,Series 400B.

SB 52-20 - INSP Aug 1969 - R 52 Entry door tensator motor torque drum driveshaft, shearing of drive pin.

Model DH 125, Series 400A. Model HS 125,Series 400B.

SB 52-21 Dec 1969 - O 52 To transfer power supply for entry door warninglight from 'PSI' to 'PE' bus bar.

Series 400A 400B





SB 52-22 Jan 1970 - R 52 Passenger/Crew. To introduce larger tubularrivets with sealing pins for attachment of endfittings to outward opening door handrail lowerstay tube.

Model D.H. 125, Series 400A. Model H.S. 125,Series 400B.

SB 52-23 May 1977 3 O 52 Outward opening passenger door.Improvements to tensator motor installation.

Model DH.125, Series 400A. Model BH.125,Series 400A. Model HS.125, Series 400B

SB 52-24 Oct 1970 - R 52 Entry door stay handrail pivot shaft.Introduction of shaft without waisted portion.

Model D.H.125, Series 400A. Model B.H.125,Series 400A. Model H.S.125, Series 400B

SB 52-25 May 1971 - R 52 Outward opening passenger door operatingmechanism , addition of profile plate tointerlock plate.


SB 52-26 Jun 1971 - O 52 Outward opening passenger door. Tread paneledge cappings now bolted through top andbottom flanges.

Model DH.125, Series 400A. Model BH.125,Series 400A. Model HS.125, Series 400B.

SB 52-27 Dec 1972 - O 52 Cabin passenger escape hatch. To reducenoise entering the passenger cabin.

Model DH.125, Series 1A, 1A-522, 1A/S-522, 3A,3AR, 3ARA and 400A. Model BH.125, Series400A. Model HS.125, Series 1, 1-521, 1B,1B-522, 1B/R-522, 1B/S-522, 3B, 3BRA and400B.

SB 52-28 Feb 1972 - O 52 Outward opening passenger door. New eyeend and securing bolt attachment tensatorcable to structure.

Model DH.125, Series 400A. Model BH.125,Series 400A. Model HS.125, Series 400B.

SB 52-29 Feb 1972 - R 52 Entry door tensator cable, possible foul atfairlead assembly.

Applicable to HS/DH/BH 125 aircraft, Series 400Aand 400B

SB 52-3 Feb 1966 2 O 52 To improve fastening of rear equipment bayaccess door.

Series 1, 1A and 1B

SB 52-30 Jul 1973 - O 52 Entry door. To strengthen door stay bottomtube.

Model DH.125, Series 400A. Model BH.125,Series 400A. Model HS.125, Series 400B and401B

SB 52-31 Feb 1974 - R 52 Outward opening passenger door. Stop forhand lever interlock plate replaced by steelstop with increased offset.

Model DH.125, Series 400A. Model BH.125,Series 400A. Model HS.125, Series 400B, 401Band 403B.

SB 52-3157 Nov 1998 - R 52 Doors - Main entry door hinge attachment boltinspection/replacement

Hawker 800XP





SB 52-34 Sep 1978 1 R 52 To introduce a strengthened and improvedtensator cable arrangement to reduce thepossibility of failure at upper end.

Model DH.125, Series 400A, 400A (C) and 400B.Model BH 125, Series 400A, 403B, 600A and600B. Model HS 125, Series 600A.

SB 52-36 Jul 1979 1 R 52 Outward opening door tensator motor.Introduction of stronger springs.

Model HS/BH.125, Series 400, 401, 403 and allvariants. Model HS/BH.125, Series 600 and allvariants. Model HS.125, Series 700 and allvariants.

SB 52-3644 Feb 2004 - O 52 Doors - Main Entry Door HandrailRepair/Replacement

BAe.125 Series 800A; BAe.125 Series 800B;Hawker 800 and Hawker 800XP through Serial258636 equipped with P/N 800-8270-18 foldinghandrail assembly.

SB 52-37 Feb 1980 - R 52 To introduce supplementary seal at escapehatch.


SB 52-38 Nov 1983 1 I 52 Doors - Passenger/crew and access -Introduction of 'Medeco' security locks

All Series up to and including 700 Mod.251918

SB 52-39 Mar 1984 1 R 52 Outward opening main entry doors.Introduction of X - ray inspection.

Applicable to HS/BH 125 Series 400 aircraft

SB 52-4 Jan 1965 - O 52 To introduce improved stowage for entrancedoor return counter balance hook (Behindluggage bay trim).

Series 1, 1A and 1B

SB 52-40 Nov 1985 - I 52 To introduce an internal lock to the escapehatch to prevent entry when parked. (Using theoutboard emergency release facility).

All HS/BH 125 Series 600 and 700 aircraft

SB 52-41 Jan 1991 1 O 52 Doors - Emergency exit - to introduce anescape hatch internal lock


SB 52-42 Feb 1993 - R 52 Doors - Main Entry - Introduction of cable loomprotection over the door operating mechanism


SB 52-44 Feb 1994 - O 52 Doors - Rear Baggage Bay - To Re-Introducethe rear baggage bay external access door

BAe125 Series 1000A and Hawker 1000

SB 52-46 Jan 1995 - R 52 Inspection of emergency escape hatch latch forpossible foul with re-inforcing strap.

Applicable to Hawker 1000 and BAe 125 Series1000A and B

SB 52-48 Jun 1996 - M 52 Doors - Inspection of main entry door/framepressing for possible fatigue cracking

Applicable to all DH/HS 125 Series 1 and 3(including variants), Pre-Mod 251429

SB 52-5 Sep 1965 - R 52 Main entry. To introduce a stronger main doorlock lever.






SB 52-6 Aug 1965 - O 52 To introduce Customs locking eyebolt onpassenger door structure.


SB 52-7 Nov 1965 - O 52 Passenger/crew. To improve the functioning ofthe door return mechanism.


SB 52-8 Nov 1965 - O 52 Passenger/crew. To improve the door track &roller installation.


SB 52-9 Oct 1965 - R 52 Main entry door. To restrict the amount bywhich the door interior handle beds into thedoor trim.


SB 52-A22 Nov 1969 - M 52 Entry door lower stay assy. Failure of rivetsattaching end fittings.

Applicable to H.S. 125 aircraft Series 400A and400B.





ATA Chapter 53Fuselage

SB 53-1 Nov 1964 - O 53 To introduce rudder post sealing. Series 1A and 1B

SB 53-12 Oct 1965 - I 53 Introduces modified fairlead in floor of cabin. Series 1A, 1B and 3

SB 53-13 Aug 1965 - I 53 To introduce hydraulic pipe cover on frontpressure bulkhead with improved lowerattachments.

Series 1, 1A and 1B

SB 53-15 Dec 1967 1 O 53 Cone and Fillets / Fairings. To introduceimproved support strut for Nosecone.

Series 1A, 1B and 3

SB 53-16 Oct 1966 - R 53 Cone and Fillets / Fairings. To introducesealing of Grimes anti-collision Beacon inunder Fairing.


SB 53-17 Mar 1967 2 R 53 Attachment fittings. To reinforce Flapmechanism attachment fittings on theFuselage.

Series 1, 1A and 1B

SB 53-18 Jan 1966 - O 53 Modified RH cockpit floor panel & accesscover.

Series 1A and 1B

SB 53-19 May 1966 - O 53 Rear fuselage. To ease installation of tail conefairing.


SB 53-2 Nov 1965 - R 53 Reinforcement of frame 17. Series 1, 1A and 1B

SB 53-20 Jun 1966 - O 53 Fairings. To introduce a drain hole in Wing /Fuselage Fairing & to seal edges of underFairing with Thiokol.

Series 1, 1A and 1B

SB 53-21 Aug 1966 - O 53 Escape Hatch Aperture. To increase clearencebetween passenger Escape Hatch &surrounding A/C structure.

Series 1, 1A and 1B

SB 53-22 Oct 1967 3 M 53 Engine Mounting Beam. To strengthen lowerchannel & replace foam filling with light alloyplates.


SB 53-23 Oct 1966 - R 53 Cone and Fillets / Fairings. To introduce arevised corner shape for Fuselage to WingFairing.






SB 53-24 Dec 1966 - I 53 To introduce stiffer mounting for aileronautopilot servo unit.


SB 53-25 Nov 1966 - O 53 Front Equipment Bay. Introduction of water trapat NACA Intake Duct.


SB 53-26 Nov 1966 - O 53 Nose. To introduce reinforcing of nose fuselageskins & structure.


SB 53-27 Nov 1966 - O 53 Structure/general. To delete entry door treadplate & introduce cover plates overcounter-bored bolt holes.


SB 53-28 Oct 1971 2 O 53 Nose cone. To introduce more robust lightningdiverter strips on nose radome & to ensurebonding of these strips.


SB 53-29 Apr 1967 1 R 53 Bracket installation for Nose Landing Gearlooseness of Mounting Bracket bolts.

Applicable to H.S.125 aircraft, all Series

SB 53-3 Sep 1972 3 I 53 To reinforce upper sidewall beam on frontpressure bulkhead

Series 1, 1A and 1B

SB 53-30 Mar 1967 - O 53 Cone and Fillets / Fairings. To introduce meshguard over outlet in Tailcone

Series 1, 1A, 1B, 3A and 3B

SB 53-31 Apr 1967 - O 53 Cone and Fillets / Fairings. To improve themethod of sealing the Wing to Fuselage Fairingagainst the ingress of water.


SB 53-3118 Dec 1998 - M 53 Fuselage - Inspection for out-of-position bolts BAe 125 Series 800A/800B; Hawker 800; Hawker800XP

SB 53-3138 Aug 1998 - O 53 Fuselage - General - Introduction of provisionsfor a baggage pannier

Hawker 800 XP.

SB 53-3164 Nov 1998 - O 53 Restricted - See Remarks Hawker 800 U-125A (JASDF) airplanes

SB 53-3186 Feb 1998 - M 53 Fuselage - Sealing of Fuselage Keel Stringers Hawker 800XP

SB 53-3192 Jul 1998 - O 53 Fuselage - Installation of a simplified seal at thedorsal intake

BAe 125 Series 800A/800B and 1000A/1000B;Hawker 800; Hawker 800XP and Hawker 1000.

SB 53-32 Jul 1967 1 R 53 Cone and Fillets / Fairings. To introducedrainage and further sealing on front Wing toFuselage Fairing.






SB 53-3279 Jun 1999 - O 53 Fuselage - Fuselage Drainage - Introduction ofretaining ring on keel drainage valve

All BAe 125 Series 800 and 1000, Hawker 800(including Major Variant U125A) and Hawker1000; Hawker 800XP.

SB 53-33 Dec 1981 6 O 53 Fuselage – Wings – To convert 1A/522 aircraftto 3A aircraft zero fuel take-off weights, butlanding weight is retained as for 1A/522

Series 1A/522

SB 53-3310 Jul 2001 - R 53 Fuselage - Introduction of modified gutterarrangement in radome mounting area

Hawker 800XP

SB 53-3314 Apr 1999 - O 53 Installation of doublers on fuselage skins Hawker 800XP

SB 53-34 Nov 1967 - R 53 Engine Mounting Beam. To facilitate theembodiment of Mod.251723 Part B.


SB 53-3438 Jan 2002 1 M 53 Fuselage - Inspection of 4 missing rivets at thetop center of frame 13 on honeywell equippedairplanes

Hawker 800XP

SB 53-35 Dec 1967 - R 53 Drainage. To introduce an additional drainageadjacent to the rear Fuselage drain.


SB 53-3511 Jul 2004 - R 53 Fuselage - Floorboard Attachment ScrewRelocation

Raytheon Aircraft Model 400A Hawker 400XP,Serials RK-354 through RK-357.

SB 53-3511 Jul 2004 - R 53 Fuselage - Floorboard Attachment ScrewRelocation

Raytheon Aircraft Model 400A Beechjet, SerialsRK-5 through RK-353; Raytheon Aircraft Model400A Hawker 400XP, Serials RK-354 throughRK-357.

SB 53-3569 Aug 2003 - M 53 Fuselage - Frames 12 and 14 Ground StudModification


SB 53-36 Jan 1968 - R 53 Nose radome. Additional bolts for internallightning diverter strips.

Series 3A/R and 3B





SB 53-3623 Mar 2005 1 M 53 Fuselage - Wing-to-Fuselage attachment linkinspection for proper washer installation

Hawker 800XP, Serial Numbers 258297, 258301,258304, 258309, 258311, 258313, 258315,258317, 258319, 258320, 258322, 258326,258331, 258334 through 258340, 258344,258345, 258347, 258349, 258354 through258356, 258358, 258359, 258361 through258369, 258371 through 258380, 258382 through258400, 258402 through 258406, 258408 through258420, 258422 through 258426, 258428 through258433, 258435 through 258444, 258446,258448 through 258468, 258470 through 258492,258494 through 258512, 258514 through 258532,258534 through 258569 and 258570 through258617. Hawker 800XP (SIVAM), Serial Numbers258401, 258421, 258434 and 258447. Hawker800XP (Korean Special Mission), Serial Numbers258342, 258343, 258346, 258350 through258353 and 258357.

SB 53-37 Oct 1968 - R 53 Nose leg mounting bracket on RH side of nosegear bay. Cracked.

Applicable to H.S. 125 aircraft, all Series.

SB 53-3734 Dec 2005 - M 53 Fuselage - Inspection for Drainage at Frame17A

Hawker 800XP, Serial Numbers 258266, and258277 through 258750, excluding Hawker 800(U-125A).

SB 53-3797 Dec 2006 - O 53 Fuselage - Static Plate Mounting Modification BAe.125 Series 800A; BAe.125 Series 800B;Hawker 800; and Hawker 800XP, Serial Numbers258001 through 258736 and 258738 through258746

SB 53-38 Feb 1969 1 O 53 To introduce stiffeners in th RH panel betweenframes 11 and 12.

Series 1, 1A, 1A-522, 1A/S-522, 1A/S-522, 1B,1B-522, 1B/R-522, 1B/S-522, 3A, 3A/R, 3A/RA,3B and 3B/RA

SB 53-3814 Apr 2007 - R 53 Fuselage – Aft Fuselage Fuel Tank StructureRivet Replacement

Hawker Beechcraft Model 400A (Hawker 400XP),Serials RK-476 through RK-489 and RK-491.

SB 53-3822 May 2007 - R 53 Fuselage - Forward Pressure Bulkhead RudderPedal Pressings Chafing Inspection


SB 53-3882 Apr 2008 - R 53 Fuselage - Wing-to-Fuselage Fairing AssemblyInspection and Modification

Model 400A, Beechjet (Hawker 400XP), SerialsRK-368 through RK-381, RK-384 throughRK-405, RK-407 through RK-420, RK-423through RK-431, RK-434, RK-437 throughRK-483, RK-487 through RK-529, RK-531 andRK-533.





SB 53-4 Dec 1964 - R 53 To extend fatigue life of canopy top skinbeyond 1500 flights or 2 years whichever is theearlier.

Series 1, 1A and 1B (A/o not incorporating Mod.No.251206)

SB 53-40 Jun 1969 - R 53 Fairings. To prevent foul between structure andcover on flap control bevel shaft assembly.

Series 3A/RA and 3B/RA (Pre Mod 251873 - PartB)

SB 53-41 Jan 1977 2 O 53 Canopy Blister. To introduce composite fibreglass / metal blister.

Model DH 125, Series 1A, 1A-522, 1A/S-522, 3A,3AR and 3ARA. Model HS 125, Series 1, 1B,1B-522, 1B/R-522, 1B/S-522, 3B and 3BRA

SB 53-42 Mar 1970 - R 53 Checking for cracking of VOR / LOC Aerial Boxattachment brackets.

Applicable to H.S. 125 aircraft Series 400A and400B

SB 53-43 Apr 1976 3 M 53 Front Pressure Bulkhead. Reinforcing platesadded to sidewall beams.

Model DH 125, Series 1A and 1A-522. Model HS125, Series 1, 1-521 and 3B

SB 53-44 May 1975 1 R 53 To improve protective treatment of fuselageskin under canopy blister.

Model DH. 125, Series 1A, 1A-522, 1A/S-522, 3A,3AR, 3ARA and 400A. Model BH.125, Series400A. Model HS.125, Series 1, 1-521, 1B,1B-522, 1B/R-522, 1B/S-522, 3B, 3BRA, 400B,401B and 403B

SB 53-44 - INSP Nov 1973 - R 53 Skin under canopy blister fairing. Inspection forcorrosion.

Model DH. 125, Series 1A, 1A-522, 1A/S-522, 3A,3AR, 3ARA and 400A. Model BH.125, Series400A. Model HS.125, Series 1, 1-521, 1B,1B-522, 1B/R-522, 1B/S-522, 3B, 3BRA, 400B,401B and 403B

SB 53-45 Dec 1973 - R 53 Sealing and drainage. Improvements todrainage in rear fuselage.

Model DH.125, Series 1A, 1A-522, 1A/S-522, 3A,3AR, 3ARA and 400A. Model BH.125, Series400A and 600A. Model HS.125, Series 1, 1-521,1B, 1B-522, 1B/R-522, 1B/S-522, 3B, 3BRA,400B, 401B, 403B and 600B

SB 53-46 Mar 1982 3 M 53 Fuselage - Canopy post A-B - Addition of failsafe links at bottom joint

Series 1A 1A-522 3B 400A 403B 600

SB 53-5 Jan 1965 - O 53 Fuselage - Cones and Fillets/Fairings - Toimprove the stiffness of the wing to fuselagefront fillet & method of sealing against ingressof water.

Series 1A and 1B





SB 53-50 Sep 1978 2 M 53 Radome. To introduce improved lightning strikeprotection.

Model DH.125, Series 1A, 1A-522, 1A/S-522, 3A,3AR, 3ARA, 400A and 403A (C). Model BH.125,Series 400A and 600A. Model HS.125, Series600A and 700A. Model HS.125, Series 1, 1-521,1B, 1B-522, 1B/R-522, 1B/S-522, 3B, 3BRA,3BRC, 400B, 401B, 403B, 600B and

SB 53-51 Oct 1978 1 R 53 Repositions holes of autopilot rudder servomounting.

Series 700 and all variants

SB 53-52 Jun 1980 - R 53 Front Pressure Bulkhead. Cracking of controlpressure at corner radius.


SB 53-53 Jan 1980 - R 53 Skin. Inspection of area bounded by Dorsal AirIntake.

Applicable to HS/BH 125 aircraft Series 600

SB 53-54 Jan 1981 - R 53 Fuselage - Skin - Inspection of area boundedby engine pylon

Applicable to HS/DH/BH 125 aircraft with Viperengines, Series 1, 1-521, 1-522, 1A, 1A-522,1A/S-522, 1B, 1B-522, 1B/R-522, 1B/S-522, 3A,3A/R, 3A/RA, 3B, 3B/RA, 3B/RC, 400A, 403A (C),400B, 403B, 600A and 600B

SB 53-55 Jan 1981 - R 53 Fuselage - Skin - Inspection of fuselage skin inwing/fuselage joint area

Applicable to HS/DH/BH 125 all Series up to andincluding Series 600

SB 53-56 May 1981 - R 53 Ventral fin. Improved VLF aerial pre-amplifierinstallation.

Series 700B post Mod. 258148 or 258172

SB 53-57 Jan 1982 - R 53 Fuselage - Entry door surround - Corrosion Applicable to DH/HS 125 aircraft, Series 1, 1-521,1-522, 1A, 1A-522, 1A/S-522, 1B, 1B-522,1B/S-522, 1B/R-522, 3A, 3A/R, 3A/RA, 3B, F-3B,3B/RA, 3B/RC and F-3B/RA

SB 53-58 Oct 1986 3 I 53 Radome - To introduce clear protective cap forradome

Models HS/DH/BH.125 PART A & D Series 1, 3and 400. PART B & C Series 600, 700 and 800.

SB 53-59 Jan 1987 2 M 53 Fuselage - Reinforcement of Canopy UpperRail.

B.Ae 125 Series 800A and 800B

SB 53-6 Mar 1965 - R 53 To extend reinforcing & to provide shorter boltswith thin nuts on crew seat rails.


SB 53-60 Nov 1985 - M 53 Fuselage - Pipe Installation - Possible Fouling Applicable to all B.Ae 125 Series 800

SB 53-61 Dec 1985 - R 53 Corrosion of the Fuselage skin beneath ram airducting cuff flange Aft of Frame 19.

Applicable to all BH/DH/HS 125 Series 600 and700 and all variants





SB 53-62 Oct 1986 1 M 53 Fuselage - Ventral tank aft attachment -Fuselage keel steel fitting

B.Ae. 125 Series 800A and 800B

SB 53-63 Feb 1987 - M 53 Fuselage - Outer skin - Introduction ofadditional inspection requirements

Series 1 1A 2 3B(A/C 25001 to 020) that are inexcess of 7500 flights

SB 53-64 Jun 1988 - O 53 Fuselage - Sealing & drainage - To introduceimproved drainage of fuselage keel

All Series up to and including 800 ( A/C 258092and subs less 258097)

SB 53-65 Mar 1989 1 M 53 Fuselage - Nose Section - To introducereinforcing straps to windscreen centre pillar


SB 53-66 May 1988 2 R 53 Fuselage - Entry door surround - To introduceimproved attachment of handrail support cast

This Modification is applicable to all SeriesDH/BH/HS/BAe 125 aircraft which are Post Mod.251918 or 252906

SB 53-67 May 1988 1 I 53 Fuselage - General - To introduce commonprovision for an interchangeable ventral fueltank and baggage pannier

BAe 125 Series 800 Pre-Mod.259292

SB 53-68 May 1988 1 I 53 Fuselage - General - Introduction of a modifiedbaggage pannier for A/C Post Mod.259499A

BAe 125 Series 800 Post-Mod.259499A

SB 53-69 Apr 1988 - O 53 Fuselage - Nose - To introduce reprofiled draingutter on Frame 1 bulkhead

Applicable to Series 600 and 700 aircraft whichare Post Mod.252109 and Pre Mod.252922

SB 53-7 Apr 1965 - I 53 To introduce shrouded bearings at all pointswhere shafts pass through pressure hull.

Series 1, 1A and 1B

SB 53-70 May 1988 - R 53 Fuselage - Sealing and Drainage - Wing centresection improved drainage

Series 800B

SB 53-71 Nov 1989 - M 53 Fuselage - Rear equipment bay - Possibility ofchafing between duct and rear pressurebulkhead

Applicable to all BH/DH/HS 125 aircraft Series 1,1A, 1B and 3B

SB 53-73 May 1991 2 M 53 Fuselage - Inspection of nose landing gear baysidewall for cracks

Applicable to all DH/BH/HS 125 aircraft up to andincluding Series 800A and 800B

SB 53-74 Mar 1992 1 M 53 Fuselage - Fairings - Introduction of drainmasts at rear equipment bay vent outlets

All Series up to and including series 800 - seeservice bulletin for the detail.

SB 53-75 Mar 1992 - R 53 Inspection of LH forward passenger seat rail forpresence of web stiffeners and cleats (Frames10B and 10C ).

Applicable to BAe 1000 Series

SB 53-76 Feb 1994 - M 53 Centre Fuselage. Introduction of additional ventarea at frame 10D right hand.

BAe Series 1000A and 1000B and Hawker 1000





SB 53-77 Nov 1992 - R 53 Structures - General = Inspection of frameassembly No.16 for presence of two reinforcingstrip bolts and nuts

Series 1000 (A/C 259004 to 014 017 024)

SB 53-79 Apr 1993 - R 53 Fuselage - Inspection of rear ventral fairings forpresence of drain holes

BAe 125 Series 1000 (259003, 259004, 259005,259006, 259007, 259008, 259009, 259010,259011, 259012, 259013, 259014, 259015,259016, 259017, 259018, 259019, 259020,259021, 259022, 259023, 259024, 259025,259026, 259027, 259028, 259029, 259030,259031, 259032, 259303, 259034, 259035,259036)

SB 53-8 Jun 1965 - I 53 To introduce additional stiffener on wing tofuselage fairing side panel.

Series 1, 1A and 1B

SB 53-80 Jul 1994 - R 53 Introduction of a replacement sealing cuff at thedorsal intake.

All BH/HS 125 Series 600A, 600B, 700A and700B which are Post Mod.252108

SB 53-81 Feb 1994 - M 53 Centre Fuselage - Introduction of additionalvent area between the cabin and the right handunderfloor area.


SB 53-82 Dec 1995 3 M 53 Fuselage - To introduce improved fluiddrainage in the fuselage

BAe 125 Series 800A, 800B, Hawker 800 andspecial variants (C29A, U125, U125A)

SB 53-83 Jun 1995 - R 53 To introduce improved fluid drainage in thefuselage.

HS 125 Series 700A and 700B

SB 53-84 Jun 1994 1 R 53 Fuselage - Inspection of rear Ventral Tank toiletarea for presence of drain holes

Applicable to BAe 125 Series 800A, 800B, 1000Aand 1000B

SB 53-85 May 1995 1 M 53 Fuselage - To introduce improved fluiddrainage in the fuselage

BAe 125 Series 800A

SB 53-86 Aug 1995 - R 53 To introduce improved fluid drainage in thefuselage.


SB 53-87 Feb 1995 - I 53 Restricted - See Remarks BAe 125 Series 800A U-125 (258215, 258227,258242)

SB 53-88 Dec 1996 - R 53 Inspection of LH & RH fuselage / fairinginterface-frames 23/24 for presence of foamblock.

Applicable to all BAe 125 Series 1000A, B andHawker 1000

SB 53-90 Dec 1996 - M 53 Inspection of fuselage - RH side under rearventral tank - For presence of reinforcing strapat frame 22.

Applicable to BAe 125 Series 1000A, B andHawker 1000





SB 53-92 Dec 1996 - R 53 Restricted - See Remarks Hawker 800 U-125A (JASDF)

SB 53-93 Apr 2000 2 M 53 Fuselage - Inspection of the upper fuselageskin around periphery of the cockpit canopyblister interface for possible scoring

DH 125 Series 1A; HS 125 Series 1B; DH 125Series 1A-522; HS 125 Series 1B-522; DH 125Series 1A/R-522; HS 125 Series 1B/R-522; DH125 Series 1A/S-522; HS 125 Series 1B/S-522;DH 125 Series 3A; HS 125 Series 3B; DH 125Series 3A/R; HS 125 Series 3B/R; DH

SB 53-95 Apr 1999 1 M 53 Fuselage - Inspection/Introduction of rivets atframe 19

All HS 125 Series 700. BAe Series 800 includingMajor Variants C29A, U125 and U125A: Aircraft258001 to 258254 inclusive. Hawker 800including 800XP and Major Variant U125A:aircraft 258255 to 258295 inclusive





ATA Chapter 54Nacelles/Pylons

SB 54-1 May 1998 1 M 54 Pylons - To introduce filling of unused toolingholes on the LH & RH engine pylon firewalls

BAe 125 Series 800A, 800B, Hawker 800including special variants (C29A, U125, U125A)and Hawker 800XP Pre Mod. 253815A

SB 54-3 Jan 1997 - R 54 Lower engine access cowlings. Introduction ofoil drain grommet.

BAe 125, Series 1000 and Hawker 1000

SB 54-3129 Jan 1999 - R 54 Inspection of the LH an RH engine pylonclosing panels

BAe 125 Series 800A, 800B [including majorvariant C29A], Hawker 800 [including majorvariant U125A], and Hawker 800XP

SB 54-3788 Dec 2006 - M 54 Nacelles - Engine Cowling FastenerModification

(a) Civil - Raytheon Aircraft Model 400 Beechjet,Serials RJ-1 through RJ-65; Raytheon AircraftModel 400A Beechjet, Serials RK-1 throughRK-353; Raytheon Aircraft Model 400A (Hawker400XP), Serials RK-354 through RK-499. (b)Military Raytheon Aircraft Model 400T (T-1A)Beechjet, Serials TT-1 through TT-180; RaytheonAircraft Model 400T (TX) Beechjet, Serials TX-1through TX-13. If you are no longer in possessionof the airplane, please forward this information tothe present owner. (2) Spares - All customer heldspare engine cowlings require modification inaccordance with Kit No. 132-9100-0001/-0002.





ATA Chapter 55Stabilizers

SB 55-1 Dec 1964 1 O 55 To introduce modifications to top offin-to-tail-plane bullet fairing & lower edge ofoverfin.

Series 1, 1A and 1B

SB 55-10 Mar 1965 - I 55 To introduce a special build of tailplanes &elevators suitable as spares replacements forA/C not embodying Mod.251024.

Series 1

SB 55-11 Apr 1965 - I 55 To reduce the level of static build up onelevators thereby reducing radio interference.


SB 55-12 Apr 1965 - O 55 To improve the clearance between the levers inmax elevator ÙP' position.

Series 1 1A 1B

SB 55-13 May 1965 - O 55 To introduce redesigned joint between ruddercontrol quadrant & rudder torque tube.

Series 1

SB 55-14 Apr 1965 - O 55 To introduce retaining cable for access coveron fin/tailplane bullet fairing.

Series 1, 1A, 1B and 2.

SB 55-15 Jul 1965 - I 55 To introduce two-piece main ballast weight inlower part of rudder leading edge.


SB 55-16 Jul 1965 - I 55 To introduce Series 3 type 1A of fin/tailplanefairing.

Series 1A and 1B

SB 55-18 Jul 1965 - O 55 To give increased clearance between betweenelevator & bullet fairing.

Series 1, 1A and 1B

SB 55-2 Nov 1964 - I 55 To change material of bolts attaching fin skinsto fin root rib & intermediate diaphragms fromsteel to light alloy.

Series 1 and 1B.

SB 55-21 Oct 1965 - O 55 Rudder. To fit spacing washers between thedriving lugs on rudder quadrant and the spiderconnecting rudder post to quadrant.

Series 1A, 1B and 3

SB 55-22 Feb 1966 - O 55 Replaces cadmium plated hi-torque c'sunkscrews attaching fin & tailplane leading edges.

Series 1 1A 1B

SB 55-23 May 1966 - I 55 Rudder. To introduce a mated assy of theupper rudder hinge fitting & the geared tablever & to reduce the nominal gear.






SB 55-24 Jun 1966 - O 55 Horizontal Stabilizer. Rivetting of chain rubbingstrips to detachable cover plates at rear spar.

Series 1, 1A, 1B and 3, with Mod.251241

SB 55-25 Dec 1966 - O 55 Horizontal Stabilizer. To introduce modifiedbush & shimming for elevator master hingefitting.


SB 55-26 Nov 1966 - I 55 Upper Vertical Stabilizer. To introduce specialbolts attaching bullet fairing to overfin.


SB 55-27 Jul 1967 - R 55 Horizontal Stabilizers. To introduce revisedmaterial for rubbing strips on elevator trimchain cover plates.


SB 55-28 Sep 1967 - R 55 Elevators (LH & RH) Leading edge skincorrosion.

Applicable to HS.125 aircraft, all series, withproduction Serial Nos. 25129 and earlier, 25132and 25135.

SB 55-29 Feb 1975 2 O 55 Horizontal Stabilizer - Improved protectivetreatment for tailplane attachment bolts

Model DH.125 Series 3A, 3AR and 3ARA and400A. Model BH.125 Series 400A and 600A.Model HS.125 Series 3B, 3BRA, 400B, 401B,403B and 600B

SB 55-3 Nov 1964 - I 55 To introduce new underfairing incorporatingnew method of attachment.

Series 1and 1B, 25011 and SUBS

SB 55-30 Sep 1975 1 R 55 Flight controls. Elevators. To add drain holesand improve treatment in way of leading edgethus obviating the need for repeat inspections.

Model DH.125. Series 1A, 1A-522, 1A/S-522, 3A,3AR, 3ARA and 400A. Model BH.125 Series400A and 600A. Model HS.125 Series 1,1-521,1B, 1B-522, 1B/R-522, 1B/S-522, 3B,3BRA, 400B, 401B, 403B and 600B.

SB 55-30 - INSP Feb 1975 - R 55 Stabilizers - Elevator - Accumulation of waterwithin the elevator leading edge

Model DH.125. Series 1A, 1A-522, 1A/S-522, 3A,3AR, 3ARA and 400A. Model BH.125 Series400A and 600A. Model HS.125 Series 1,1-521,1B, 1B-522, 1B/R-522, 1B/S-522, 3B,3BRA, 400B, 401B, 403B and 600B.

SB 55-31 Feb 1976 1 O 55 Horizontal Stabilizer. Fibreglass tip replacesmetal tip, to reduce the possibility of jamming ofthe elevator mass balance arm.

Model DH.125 Series 1A, 1A-522, 1A/S-522, 3A,3AR, 3ARA, 400A and 400A(C). Model BH.125Series 400A and 600A. Model HS.125 Series 1,1-521, 1B, 1B-522, 1B/R-522, 1B/S-522, 3B,3BRA, 3BRC, 400B, 403B and 600B

SB 55-32 Jul 1977 - R 55 Elevator Trim Tabs. Inadequate drainage ofconnecting rod fairings .






SB 55-33 Dec 1982 - M 55 Stabilizers – Attachment fitting – Possibility ofcorrosion

Applicable to HS/DH/BH 125 aircraft all series upto and including series 600

SB 55-34 Jan 1995 - R 55 Stabilisers - Inspection of LH and RH tailplanesfor presence of drain holes

Applicable to BAe 125 Series 800A and B, 1000Aand B, Hawker 800 and Hawker 1000 aircraft.

SB 55-35 Aug 1996 - M 55 Lower vertical stabilizer - Inspection of lowervertical stabilizer upper closing rib (Fin Rib 6)for possible oversized or elongated Fin Rib 6attachment holes

BAe 125 Series 800A,B including U125 andU125A (258204 to 258254). Hawker 800 including800XP and major variant U125A (A/C 258255 to258287)

SB 55-36 Apr 1996 - M 55 Stabilisers - To introduce rudder flowseparation triggers and a revised installationprocedure for the rudder spring strut

BAe 125 Series 800A, Series 800B (includingBAe 125 Series 800 Special Varients C29A,U125), Hawker 800 and Hawker 800XP.

SB 55-4 Apr 1980 6 O 55 To increase life of hinge bearings in rudder &elevator.

Series 1, 1A and 1B (and all varients)

SB 55-5 Nov 1964 - O 55 To introduce modified rear mounting bracket foroverfin.

Series 1B

SB 55-6 Nov 1965 1 R 55 To introduce static wick dischargers Cheltontype 2-11 & 2-12.

Series 1, 1A and 1B

SB 55-7 Nov 1964 - O 55 To introduce improvements to attachment ofelevator operating lever to elevator.

Series 1 and 1B

SB 55-8 Feb 1965 - R 55 Flight controls. Elevator trim tab. Possible foulof cable guard on pulley.

Applicable to H.S Series 1, 1A and 1B aircraft notincorporating Mod.251436

SB 55-9 Mar 1965 - I 55 To introduce fairings on elevator & rudder tabs. Series 1 and 1B





ATA Chapter 56Windows

SB 56-10 May 1971 - I 56 Windscreen Panel À'. Introduction ofwindscreens incorporating plate glass from analternative manufacturing source. Panel 02512replaces 1/284.

Series 1 1-521 1A 1A-522 1A/S-522 1B 1B-5221B/R-522 1B/S-522 3A 3A/R 3A/RA 3B 3B/RA400

SB 56-13 Nov 1973 - R 56 Perpex windows. Removal of Fablon protectionon windows held as spares.

Applicable to windows held as spare or in store.

SB 56-15 Apr 1974 - M 56 Cabin windows panels. Inspection for in-situcleaning of panel interspace.

All Series up to and including 600.

SB 56-16 May 1975 2 M 56 Cockpit window panel `C'. To introducestrengthened window panel `C' not subject tothe life limitation of Pre-Mod panels.

All Series up to and including 600B

SB 56-18 Feb 1981 3 R 56 Windows – Passenger compartment – Thickerinner panel introduced together with a revisedmethod of bonding

Model DH.125. Series 1A, 1A-522, 1A/S-522, 3A,3AR, 3ARA, 400A, 400A and (C). Model BH.125.Series 400A and 600A. Model HS.125. Series 1,1-527, 1B, 1B-522, 1B/R-522, 1B/S-522, 3B,3BRA, 3BRC, 400B, 401B, 403B and 600B.

SB 56-18 - INSP Feb 1975 - R 56 Cabin windows. Separation of panels RevisionII window panels of Aircraft over 8 years old areto be removed and inspected.

Model DH.125. Series 1A, 1A-522, 1A/S-522, 3A,3AR, 3ARA, 400A, 400A and (C). Model BH.125.Series 400A and 600A. Model HS.125. Series 1,1-527, 1B, 1B-522, 1B/R-522, 1B/S-522, 3B,3BRA, 3BRC, 400B, 401B, 403B and 600B.

SB 56-2 Jun 1965 - R 56 Window Panel À'. Improvements to installationof windscreen panel À'.

Series 1 1A 1B

SB 56-20 Apr 1979 - O 56 Windscreen panel À' to introduce edge heatedpanels.

All Series 3 400 600 plus retro-fit TFE 731 engineaircraft

SB 56-22 Aug 1983 2 O 56 Flight compartment. Revised DV windowventing to reduce the possibility of panelinterspace misting.

Model HS/B.Ae.125. Series 700 and variants.

SB 56-23 Dec 1988 2 O 56 Windows - Windscreen - To introduce LucasWindscreen Panel À' LH Part NoNF24016-157 LH and RH Part NoNF24016-158

Series 800





SB 56-24 Dec 1987 - I 56 Windows - Windscreen Panel A - To introducerevised terminal block connections to Triplexwindscreen part no. 02512, 02513, 02532,02533, 02542 and 02543

All Series up to and including 700 Mod.257626

SB 56-25 May 2000 1 O 56 Windows - Windshield Panel A - To introduceexternal static drain wedges

BAe 125 Series 800 (including Major VariantU-125); Hawker 800 (including Major VariantU-125A); and Hawker 800XP Pre or Post Mod.253181A or B.

SB 56-27 Mar 1995 1 O 56 Windows - Flight deck - Introduction of newseal for direct vision (window panel B) windowpanels

DH/BH/HS 125 Series 1 to Series 700 aircraftinclusive.


SB 56-3 Dec 1970 1 I 56 Flight compartment. Window panel À'. Tointroduce windscreen panels62MPMXGF3187J in lieu of 62MPMXGF3186H & 62MPMXGF3187H.

Series 1 1A 1B 1B/S 3B (A/C 25015 062 069)

SB 56-30 Apr 1997 1 I 56 Restricted - See Remarks Hawker 800 U-125A

SB 56-3226 Nov 1998 1 O 56 Restricted - See Remarks Hawker U125A (JASDF), Serials 258245,258247, 258250, 258268, 258288, 258305,258306, 258325 and 258333

SB 56-4 Oct 1966 - I 56 Flight compartment. To ease removal &installation of RH windscreen panel `C'.


SB 56-6 Jul 1968 - O 56 To provide improved sealing for DV windows incockpit.

Series 1, 1A, 1A-522, 1A/S-522, 1A/R-522, 1B,1B-522, 3A, 3B, 3A/R, 3B/R, 3A/RA and 3B/RA

SB 56-7 Jun 1968 - O 56 Dry air system. Cabin and DV windows mistingdue to tobacco contamination.

Series 1, 1A, 1A-522, 1A/R-522, 1A/S-522, 1B,1B-522, 1B/R-522, 1B/S-522, 3A, 3A/R, 3A/RA,3B, 3B/R, 3B/RA

SB 56-8 Dec 1968 - O 56 To introduce special bolt Pt No 25 fn 4677/9 inlieu of existing bolt retaining lower ball races inDV window.

Series 1, 1A, 1A-522, 1A/S-522, 1A/R-522, 1B,1B-522, 1B/S-522, 1B/R-522, 3A, 3B, 3A/R, 3B/R,3A/RA, 3B/RA, 400A and 400B.

SB 56-9 Nov 1970 - I 56 Windscreen panel 'A'. To introduce Triplexpanel 1/284 in lieu of 62 MPMXGF 3186. PartB. To introduce Triplex panel 2/284

Series 1 1A 1A-522 1A/S-522 1B 1B-5221B/R-522 1B/S-522 3A 3A/R 3A/RA 400

SB 56-A12 Jun 1973 - M 56 Inspection of Perspex plastic transparencies forcrazing or cracking.

All Series prior to 700





SB 56-A14 Mar 1974 1 M 56 Cockpit window panel `C' - Deterioration ofinner and outer panel bonding to rubberspacer.

Series 1 1A 1B 3A 3B 400 (A/C 25003 to 199NA700 to 729)

SB 56-A16 May 1974 1 M 56 Cockpit window panel `C'. Life limintation ofPre-Mod.252410 panels.

All Series up to and including 600 PreMod.252410





ATA Chapter 57Wings

SB 57-1 Nov 1964 - O 57 To introduce new air brake connecting linkassembly.

Series 1, 1A and 1B

SB 57-10 May 1965 - O 57 To introduce cover plate for holes in wing topskin at slinging positions.

Series 1, 1A and 1B

SB 57-11 Jun 1965 - R 57 Inspection of clearances between componentsof fuselage & wing structures.

Series 1, 2 and 3 (A/C 25001 to 25034)

SB 57-13 Jul 1965 - R 57 To introduce drain for undercarriage sidestayfitting.

Series 1A, 1B and 3

SB 57-15 Jul 1965 - R 57 To re-inforce the flap centre hinge fairing atattachment bolts.


SB 57-17 Aug 1966 1 O 57 Flap Shrouds. To reduce depth of pressing oninner flap shroud.

Series 1A, 1B and 3

SB 57-18 Oct 1966 - R 57 Possibility of left and right hand aileron innerhinge upper fairing attachment bolts fouling À'lever (Pre Mod.251504).

Series 1 2 3 (A/C 25002 to 034)

SB 57-19 Nov 1965 - I 57 To introduce mushroom headed bolts in placeof countersunk head bolts.

Series 1A, 1B and 3

SB 57-20 Sep 1965 - R 57 Shrouds. Series 1, 1A, 1B and 3

SB 57-21 Nov 1965 - M 57 Flight Controls. Series 1, 1A and 1B

SB 57-22 May 1968 2 O 57 Plates/Skin. To introduce additional rubbingpads at airbrake & flap shrouds.


SB 57-23 Jun 1967 1 O 57 Flap Hinge Bracket Fairings. Introducingre-designed & strengthened fairings.


SB 57-24 Jan 1967 - O 57 Plates/Skin. To introduce enlarged clearancebetween aileron & wing skin shroud at inboardhinge.


SB 57-25 Nov 1967 - O 57 Flight Surfaces. To introduce increasedclearances at inboard end of aileron top andbottom skins.






SB 57-26 May 1967 - R 57 Flaps. To introduce an additional drain hole attrailing edge of flaps.

Series 1, 1A, 1B, 3, 3A and 3B Pre Mod. 255640

SB 57-27 Aug 1967 - R 57 Wings - Jacking Point Spigot Locating Bracket(LH & RH) - Possible foul against access door

Model H.S. 125, all series.

SB 57-28 Aug 1969 1 O 57 Fuel. To introduce Dowty sealing washers athexagon headed bolt positions through wingfuel tanks.

Series 1, 1A, 1B, 1B/R, 3A, 3A/R, 3B

SB 57-29 Nov 1971 2 R 57 Flap Vane. To introduce a modified flap inboardvane.

Series 1A/R-522, 1B/R-522, 3A/R, 3B/R, 3A/RAand 3B/RA (A/C 25094)

SB 57-3 Nov 1964 - M 57 To introduce machined geared tab lever. Series 1, 1A and 1B

SB 57-30 Nov 1971 2 O 57 Flaps. To introduce Thiokol sealant to formfilling.

Series 1A/R-522, 1B/R-522, 3A/R, 3A/RA and3B/RA (A/C 25094)

SB 57-31 Sep 1968 - R 57 Deletes spigot from flap shroud attachmentfittings.


SB 57-32 Jul 1969 - R 57 To increase clearance between inboard hingefittings when flaps are up.


SB 57-32 - INSP Oct 1968 - R 57 Flap Assembly LH & RH. Foul at inboard flaphinge.


SB 57-3214 Jul 1999 1 R 57 Wings - Introduction of additional vortexgenerators

Hawker 800 XP, Pre-Mod. 25F838A.

SB 57-33 Oct 1970 - I 57 Inner Leading Edges. Reinforced inboard ofRib 4.


SB 57-3364 Sep 2001 - O 57 Wings - Introduction of replacement ‘P’ sealson the flap shrouds

Model DH.125 series 1A, 1A-522, 1A/R-522,1A/S-522, 3A, 3A/R, 3A/RA and 400A. ModelHS.125 series 1B, 1B-522, 1B/R-522, 1B/S-522,3B, 3B/R, 3B/RA, 3B/RB, 3B/RC, F3B, F3B/RA,400B, 400B/1, 401B, 403A(C), 403B, F400B,F403B, 600A, 600B, 600B/1, 600B/2, 600B/3,F600B, 700A and 700B. Model BH.125 series400A and 600A. BAe.125 series 800A,800A(C-29A), 800A(U-125) and 800B. Hawker800 Pre Mod 253419E and (U-125A0).

SB 57-34 May 1970 1 R 57 Flap Vane. To extend trailing edge of outboardvane.

Model DH.125, Series 3AR, 3ARA and 400A.Model HS.125, Series 1B/R, 3BRA and 400B.





SB 57-35 Aug 1970 - R 57 Cover installation between Ribs 0 and 8.Insufficient clearance between access coverand main wheel door.

Model H.S. 125, Series 1B/R-522, 3A/R, 3A/RA,3B/RA, 400A and 400B

SB 57-3500 Apr 2002 - R 57 Wings - Inspection Of Aileron At OutboardHinge Casting For Cracking And Corrosion

BAe.125 Series 800A; BAe.125 Series800A(C-29A);BAe.125 Series 800A(U-125);BAe.125 Series 800B; Hawker 800; BAe.125Series 1000A; BAe.125 Series 1000B andHawker 1000.

SB 57-3518 Aug 2003 - R 57 WINGS - ADDITION OF A FIFTH DRAINHOLE ON AILERONS

BAe.125 Series 800A; BAe.125 Series800A(C-29A); BAe.125 Series 800A(U-125);BAe.125 Series 800B; BAe.125 Series 1000A;BAe.125 Series 1000B; Hawker 800; Hawker1000; Hawker 800(U-125A) Serial Numbers up toand including 258533 and Hawker 800XP SerialNumbers up to and including 258589

SB 57-37 Feb 1975 1 R 57 Flap Shroud. Cable guide for flapsynchronisation cables moved outboard.

Model DH.125, Series 3AR and 3ARA. ModelHS.125, Series 1B/R-522 and 3BRA.

SB 57-3781 Apr 2006 - O 57 WINGS - INSTALLATION OF WINGLETASSEMBLIES

Hawker 800XP, Serial 258589 only.

SB 57-38 Jul 1972 - O 57 Airbrake/Flap outboard Hinge Bolt. New closertolerance bolt introduced.

Model DH.125, Series 1A, 1A-522, 1A/S-522, 3A,3ARA and 400A. Model BH.125, Series 400A.Model HS.125, Series 1, 1-522, 1B, 1B-522,1B/R-522, 1B/S-522, 3B, 3BRA and 400B.

SB 57-3810 Oct 2006 - O 57 Wing - Installation of Winglet Assemblies Hawker 800XP, Serials 258604 through 258609,258611 through 258628, 258630 through 258684,258686 through 258734 and 258736 through258749 .

SB 57-3879 Feb 2008 - O 57 Wings - To Introduce Protective Skins on FlapLower Inboard Sides

Hawker 900XP. If you are no longer in possessionof the airplane, please forward this information tothe present owner.

SB 57-39 Sep 1973 1 O 57 Flap & Vane. To ensure adequate clearanceexists between flap vane flap drive bevelhousing and hydraulic clamp block in shroud.

Model DH.125, Series 3AR, 3ARA and 400A.Model BH.125, Series 400A. Model HS.125,Series 1B/R-522, 3BRA and 400B.

SB 57-4 Nov 1964 - R 57 To introduce thread into drag spigot to fitextracting tool.

Series 1B

SB 57-40 Jun 1975 1 O 57 Additional stringer ties to increase wingstrength and permit higher take-off weight.

Model HS.125, Series 3B/3RA.





SB 57-44 Oct 1973 3 R 57 Hinge assy. Introduction of improvedattachments.

Model DH.125, Series 1A, 1A-522, 1A/S-522, 3A,3A/R, 3A/RA and 400A. Model BH.125, Series400A and 600A. Model HS.125, Series 1, 1-521,18, 18-522, 1B/R-522, 1B/S-522, 3B, 3B/RA,400B, 403B and 600B.

SB 57-44 - INSP Jan 1973 - M 57 Flap Outer Hinge Assembly. Cracking of hingelugs and fracture of pivot bolts.

Model DH.125, Series 1A, 1A-522, 1A/S-522, 3A,3A/R, 3A/RA and 400A. Model BH.125, Series400A and 600A. Model HS.125, Series 1, 1-521,18, 18-522, 1B/R-522, 1B/S-522, 3B, 3B/RA,400B, 403B and 600B.

SB 57-45 Feb 1973 - R 57 Keel Member. To introduce drainage passagesin underskid at ATC and DME aerial positions.

Model D.H.125, Series 1A, 1A-522, 1A/S-522, 3A,3A/R, 3A/RA and 400A. Model B.H.125, Series400A and 600A. Model H.S.125, Series 1, 1-521,1B, 1B-522, 1B/R-522, 1B/S-522, 3B, 3B/RA and400B.

SB 57-46 Nov 1975 - O 57 Replacement of shouldered bolts in airbrakehinge/flap outer hinge fixed arm.

Model DH.125, Series 1A, 1A-522, 1A/S-522, 3A,3AA, 3ARA, 400A and 400A (C). Model BH.125,Series 400A and 600A. Model HS.125, Series 1,1-521, 1B, 1B-522, 1B/R-522, 1B/S-522, 3B,3BRA, 3BRC, 400B, 403B and 600B.

SB 57-47 Jan 1975 1 R 57 Centre Section Lower Skin. Cases of corrosionto detect corrosion at an early stage.

Model HS/BH/DH 125, all series.

SB 57-48 Jul 1975 1 M 57 Leading Edge. To introduce vortex generators. Model BH.125, Series 600A. Model HS.125,Series 600B.

SB 57-5 May 1967 5 R 57 Fuselage/Wings - Attachment fittings, conesand fillets/fairings. To introduce improvedcentre flap hinge support webs & fairings

Series 1, 1A and 1B

SB 57-50 Nov 1975 - O 57 Flap Shrouds. To strenthen outer shroud andstiffen inner shroud.

Model DH.125, Series 1A, 1A-522, 1A/S-522, 3A,3AR, 3ARA, 400A and 400A (C). Model BH.125,Series 400A and 600A. Model HS.125, Series 1,1-521, 1B, 1B-522, 1B/R-522, 1B/S-522, 3B,3BRA, 3BRC, 400B, 403B and 600B.

SB 57-51 Apr 1976 - M 57 Wings - Aileron inner hinge bracket assembly -Insufficient engagement of cable guard inthread insert

Model HS/DH/BH 125, all series.

SB 57-52 May 1976 - R 57 Main Gear Door Attachment. Forward HingeBrackets Loose.

Model HS/DH/BH 125, Series 1B/R, 3A/R, 3B/R,400A, 400B, 600A and 600B and all variants.





SB 57-53 Sep 1980 1 I 57 Wings - Flight surfaces - PTFE pads added totop airbrakes and rubbing plates added to flapvane

Model DH.125, Series 3AR, 3ARA, 400A and403A (C). Model BH.125, Series 400A and 600A.Model HS.125, Series 600A, 700A and 800A.Model HS.125, 1B/R-522, 3BRA, 3BRC, 400B,403B, 600B, 700B and 800B.

SB 57-54 Mar 1978 - M 57 Flap Outer Hinge. Installation of steel strap ataft lug on flap hinge arm.

Model DH/HS.125, Series 1 and 3 and allvariants. Model HS/BH.125, Series 400, 401, 403and 600 and all variants. Model HS.125, Series700 and all variants.

SB 57-54 - INSP Feb 1978 1 M 57 Flap Outer Hinge Assembly. Cracking of lug onhinge arm.

Model DH/HS.125, Series 1 and 3 and allvariants. Model HS/BH.125, Series 400, 401, 403and 600 and all variants. Model HS.125, Series700 and all variants.

SB 57-55 Feb 1992 2 M 57 Wings - Flap outer hinge assembly - Inspectionof hinge assemblies with modification 252670

Model HS/DH/BH 125, all series up to andincluding Series 700.

SB 57-56 Dec 1978 1 I 57 Restricted - See Remarks Series 1A (A/C 25038)

SB 57-57 Jan 1982 5 O 57 Wings - Flap outboard hinge - Introduction ofsteel bracket and arm, part A: L.H., part B: R.H.

Model DH/HS.125, Series 1, 3 and all variants.Model HS/Bh.125, Series 400, 401, 403, 600 andall variants. Model HS.125, Series 700 and allvariants.

SB 57-58 Mar 1984 4 M 57 Wings - Flaps - Possible cracking of nose ribsat outboard hinges.

Model HS/BH/DH 125, all Series up to andincluding 700A and 700B.

SB 57-59 Apr 1983 1 O 57 Wings - To introduce improved bolt assemblyand bearings at the combined airbrakehinge/flap outer hinge attachments at rib 8.

Model HS/DH/BH, all Series up to and including700A and 700B.

SB 57-6 Dec 1964 - O 57 To reinforce inboard fairing at bolt positions. Series 1, 1A and 1B

SB 57-60 Jan 1984 - O 57 Wings - Flaps - To introduce a closing rib toinboard end

Applicable to all HS, BH, DH 125 aircraft to postmod 255640 standard. (Mod 255640 introducedlong range fuel tank)

SB 57-61 Jun 1985 1 M 57 Wings - Flaps - Introduction of S98 inboardhinge bolt

B.Ae. 125, Series 800A and 800B.

SB 57-62 Jul 1985 - O 57 Wings - Flaps - Improved clearance betweenupper flap shrouds and flap vane

B.Ae 125, Series 800A and 800B.

SB 57-63 Nov 1985 - I 57 Wings - Part A - Flaps - Protective skins on flapinboard underside. Part B - Protective siliconecover on leading edge of Grimes beacon.

All B.Ae. 125 Series 800A and 800B.





SB 57-64 Nov 1985 - M 57 Wings - Aileron - Addition of drain holes All B.Ae. 125, Series 800A and 800B.

SB 57-65 Dec 1985 - O 57 Wings - To introduce water drainage holes inwings between ribs 13 and 15

All 125 Series Aircraft pre Series 800.

SB 57-66 Oct 1986 2 M 57 Wings - Aileron mass balance - Possiblecracking of side plate attachment lugs

Applicable to DH/BH/HS 125 aircraft, Series 1 to700 inclusive, all variants.

SB 57-67 Feb 1987 - M 57 Bottom skin. Introduction of additionalinspection requirements.

Applicable to all DH/BH/HS 125 aircraft, series 1to 400 all variants.

SB 57-68 Jun 1987 - R 57 Wings - Possible incorrect assembly of AileronCentre Hinge

Applicable to the following B.Ae. 125 Series 800Aand 800B aircraft.

SB 57-69 Mar 1988 - R 57 Wings - Aileron Horn - Rearrangement ofbalancing components

Series 800

SB 57-7 Apr 1965 - I 57 To introduce Titanium bolts in lieu of monelbolts in vicinity of magnetic flux detector.

Series 1, 1A and 1B

SB 57-70 Jan 1988 - R 57 Wings - Flaps - To remove extension strip fromL.H. and R.H. outboard flap vane trailing edges


SB 57-71 Apr 1988 - O 57 Wings - To introduce washers between linksand bearings at forward attachment joints

Series 800- Pre Mod.253165A.

SB 57-72 Sep 1990 1 M 57 Wings - Possible in-service cracking of mainlanding gear (M.L.G.) sidestay attachment lug

Applicable to all BAe 125 Series 800A and 800Baircraft which are Pre-mod.253249A

SB 57-73 May 1992 1 M 57 Wings - Possible corrosion of wing top skinbeneath boundary layer fence

Applicable to all DH/BH/HS BAe 125 aircraft up toand including Series 700A and 700B.

SB 57-75 Jul 1993 2 M 57 Wings - Inspection of wing top skins for cracksaround countersunk attachment bolt holes andinternal stringers

Applicable to all DH/BH/HS 125 aircraft up to andincluding Series 400A and 400B.

SB 57-76 Dec 1991 - M 57 Wings - Inspection of L.H. and R.H. rear sparand outboard main landing gear supportbracket for corrosion

Applicable to DH/HS 125 up to including aircraft25109, all variants of Series 1, 1A, F1A, 1B andaircraft 25015 (Series 3B).

SB 57-77 Oct 1993 1 M 57 Wings - Inspection of wing leading edge skinsat TKS panel interfaces for possible corrosion

Applicable to BAe 125 Series 800 and 1000aircraft pre-mod.

SB 57-78 Jan 1994 - O 57 Wings - Leading Edge - Introduction of titaniumlaser drilled outboard leading edge


SB 57-8 Apr 1965 - I 57 To introduce various redesigned detailcomponents.

Series 1A and 1B





SB 57-80 Apr 2008 4 O 57 WINGS - TO INTRODUCE PROTECTIVESKINS ON THE FLAP INBOARDUNDERSIDES

Hawker 800XP; Hawker 850XP; Hawker 750,Serials HB-1 and after.

SB 57-A49 Jul 1975 - M 57 Upper Airbrake Assembly. Failure of boltsattaching outboard hinge arm.

Applicable to HS 125 aircraft, all series.

SB 57-A54 Jan 1978 1 M 57 Flap Outer Hinge Assembly. Cracking of lug onhinge arm.






ATA Chapter 71Power Plant

SB 71-1 Oct 1964 - O 71 Cowlings. To introduce modified togglefasteners on cowling doors.

Series 1

SB 71-11 Feb 1966 - O 71 To introduce adjustable hinge positions at theengine cowling doors.

Series 1, 1A and 1B

SB 71-12 May 1968 1 R 71 Drains Systems. To introduce revised fuel lowpressure switch vent pipe.

Series 1A and 1B

SB 71-13 Nov 1966 1 O 71 Mounts. To introduce a hard chrome surface onthe front engine mounting pick up nuts & bolts.


SB 71-14 Nov 1966 - O 71 Drain System. To introduce steel nut in place oflight alloy nut at engine drain pipes.


SB 71-15 Feb 1967 - R 71 Electrical power. Introduction ofStarter/Generator adaptor fixing nuts washersof Bristol Siddeley manufacture.


SB 71-16 Mar 1967 - R 71 Cowlings. To increase height of baffle in jetpipe fairing assy.


SB 71-17 Mar 1967 - R 71 Cowlings. Modification to engine cowlinghinged doors ( LH & RH).


SB 71-18 Mar 1967 - O 71 Cowlings. To introduce Thiokol sealing strips inlieu of rubber strips at engine pod fairing filletclosing panels.


SB 71-19 Apr 1968 - O 71 Drains. Addition of water drain to alternatorcooling air duct.

Series 1, 1A, 1A522, 1A/R522, 1A/S522, 1B,1B522, 1B/R522, 1B/S522, 3, 3A, 3B, 3A/R,3B/R, 3A/RA and 3B/RA

SB 71-2 Nov 1964 - O 71 To reinforce engine pod fillet top skin forward ofmain engine mounting.

Series 1, 1A and 1B

SB 71-20 Aug 1968 - O 71 To reinforce breather connection on LH enginebottom panel.

Series 1, 1A, 1A-(522), 1A/S-(522), 1A/R-(522),1B, 1B-(522), 1B/S(522), 1B/R-(522), 3A, 3B,3A/R, 3B/R, 3A/RA and 3B/RA





SB 71-21 Apr 1971 - O 71 Rear Hinged Cowling Panels. To introducebaulk on toggle acess doors.

Model DH.125, Series 1A, 1A-522, 1A/S-522, 3A,3AR, 3ARA and 400A. Model HS.125, Series1-521, 1B, 1B-522, 1B/R-522, 1B/S-522, 3B,3BRA and 400B

SB 71-22 Dec 1971 - O 71 Hinged Cowlings. Pocket added tostarter/generator cooling air intake duct.

Model DH.125, Series 1A, 1A-522, 1A/S-522, 3A,3AR, 3ARA and 400A. Model BH.125, Series400A. Model HS.125, Series 1, 1-521, 1B,1B-522, 1B/R-522, 1B/S-522, 3B, 3BRA, and400B

SB 71-23 May 1972 - R 71 Jet Pipe Fairing. To reposition access doorchain.

Model DH.125, Series 1A, 1A-522, 1A/S-522, 3A,3AR, 3ARA and 400A. Model BH.125, Series400A. Model HS.125, Series 1, 1-521, 1B,1B-522, 1B/R-522, 1B/S-522, 3B, 3BRA, and400B

SB 71-24 Dec 1976 4 R 71 Drain System. To comply with environmentalregulations mandatory in the USA after 30 June1975.

Model DH.125, Series 1A, 1A-522, 1A/S-522, 3A,3AR, 3ARA and 400A. Model BH.125, Series400A and 600A. Model HS.125, Series 1, 1-521,1B, 1B-522, 1B/R-522, 1B/S-522, 3B, 3BRA,400B, 401B, 403B and 600B

SB 71-26 Jun 1975 - O 71 Viper 601. To introduce eight lobe silencers onboth engines


SB 71-27 May 1977 1 O 71 Viper 601 Engine Breather repositioned toavoid unsightly surface staining.

Model BH 125, Series 600A. Model HS 125,Series 600A. Model HS 125, Series 600B.

SB 71-28 Jan 1978 - R 71 Pylon Electrical Fairleads. Baulk introduced toprevent incorrect assembly.

Model HS.125, Series 700 and all variants

SB 71-29 May 1978 - R 71 General. Possibility of failure of upper cowllatch.

Applivcable to HS 125 aircraft, Series 600F, 700Aand 700B

SB 71-3 Nov 1964 - I 71 To introduce spigots in pod fillet. Series 1 and 1B

SB 71-30 Jul 1978 - I 71 General. To introduce gaskets at engine/enginedriven joints To reduce the possibility ofmounting pad damage and joint leakage.

Model HS.125, Series 700 and all variants, Series600A with Mod. 252468





SB 71-3033 Mar 2003 - M 71 Power plant - Inspection/replacement of fuelhoses between the pylon and engine

NOTE: The following aircraft are affected whenthe Viper engine is installed. The following aircraftthat have been retrofitted with the TFE731 Garretengine are not affected. DH.125 Series 1A;HS.125 Series 1B; DH.125 Series 1A-522;HS.125 Series 1B-522; DH.125 Series 1A/R-522;HS.125 Series 1B/R-522; DH.125 Series1A/S-522; HS.125 Series 1B/S-522; DH.125Series 3A; HS.125 Series 3B; DH.125 Series3A/R; HS.125 Series 3B/R; DH.125 Series3A/RA; DH.125 Series 3B/RA; HS.125 Series3B/RB; HS.125 Series 3B/RC; HS.125 Series400B/1; HS.125 Series 401B; HS.125 Series403A(C); HS.125 Series 403B; BH.125 Series600A; HS.125 Series 600A; HS.125 Series 600B;HS.125 Series 600B/1 and HS.125 Series600B/2.

SB 71-31 Feb 1983 3 R 71 Power plant – TFE 731-3-1H engine –Introduction of conical spinner – Engine partno. 3072900-3 replaces 3072900-2 – TFE731-3R-1H engine – Introduction of conicalspinner – Engine part no. 3074000-2 replaces3074000-1

All Series with TFE 731-3-1H or TFE 731-3R-1Hengines

SB 71-32 Mar 1983 2 R 71 Power plant - Nacelle Inlet Cowl - FatigueDamage

Applicable to all HS 125 aircraft pre mod 252796,Series 1A, 3A, F-3B, 3A/RA, F-3B/RA, 400A,F-400B, 600A, F-600B, 700A and 700B

SB 71-33 Jun 1984 1 O 71 Power plant - General - Additional bonding ofengine electrical accessories

Model HS, DH, BH 125 all series with Garrett TFE731-3 or 3R engines up to and including Series700A and 700B

SB 71-34 Jun 1992 5 O 71 Powerplant - Engine driven hydraulic power -Introduction of ABEX pump type AP05V-086

All BAe 125 aircraft Post Mod 252902 and allHS/BH/DH 125 aircraft Post Mod 252502.

SB 71-35 Feb 1985 1 R 71 Power plant - Engine mounting - Cowling chafedamage

Applicable to all Series DH/BH/HS/B.Ae. 125aircraft fitted with Garrett TFE 731 engines

SB 71-36 Jul 1987 2 R 71 Power plant - Cowlings - Possible damage tonacelle intake cowls

Applicable to all DH/BH/HS/BAe 125 aircraft fittedwith Garrett 731-3 engines post modification252796

SB 71-37 May 1985 - R 71 Power Plant - Engine Cowling - HP bleed airduct fairing with revised trailing edge


SB 71-38 Oct 1985 1 M 71 Power plant - Engine mounting - Cowling shaftdamage

Applicable to all Series DH/BH/HS/B.Ae. 125aircraft fitted with Garret 731-3R-1H engines





SB 71-39 May 1987 - R 71 Powerplant - Cowlings - Introduce Nylonrubbing strip to upper cowling doors

This modification is applicable to all SeriesDH/BH/HS/BAe 125 aircraft with Garrett TFE731-3 engines installed.

SB 71-40 Apr 1989 2 M 71 Power Plant - Cowlings - Reinforcement of TFE731-5 Engine exhaust duct Part No.C46P13100-3 or C46P13100-103

Series 800 except Aircraft fitted with Dee HowardThrust Reversers

SB 71-41 Mar 1988 - I 71 Power plant – Combustion section – Garrettengine TFE 731-3 revised combustion system(GTEC SB.731-72-3323FE refers)

All Series Prior to 800 with TFE 731-3 engines


SB 71-43 Feb 1993 - M 71 Power Plant - Introduction of engine outer fanducts with improved sealing of the outer skinseams


SB 71-44 Feb 1993 - R 71 Power Plant - Introduction of Pratt & Whitney305B engine


SB 71-45 Sep 1994 - R 71 Engine Drains. To Introduce a gasket betweenthe engine interface and auxiliary (accessory)gearbox breather pipe.


SB 71-48 Aug 1997 1 M 71 To introduce a revised method of filling anun-drained area in the core cowling

BAe 125 series 1000, Hawker 1000, AircraftSerial Numbers 258151, 258159. 259003 through259052.

SB 71-5 Jan 1965 - O 71 To introduce new type of seal onstarter/generator cooling air outlet.

Series 1, 1A and 1B

SB 71-6 - R 71 *Superseded by SB 29-5

SB 71-7 - I 71 *Superseded by SB 10-1

SB 71-8 Mar 1966 1 R 71 Power Plant Mount Installation Incorrectassembly of front mount bearing.

Applicable to H.S. 125 aircraft Series 1A, 1B and2

SB 71-9 Feb 1968 5 O 71 General . To introduce Bristol Siddeley Viper522 engines.

Series 1A and 1B

SB 71-A28 Oct 1977 - R 71 General - Possible Incorrect Assembly ofFairlead for Starter/Generator Cables

Applicable to HS 125 Series 700 aircraft withoutmodification 252643





SB 71-A43 Feb 1993 - M 71 Power Plant - Inspection of outer fan duct (RHand LH engine ) for possible fluidcontamination or disbonding of outer skin jointsealing

Applicable to Bae 125 series 1000 A and BAircraft





ATA Chapter 72Engine Turbine/Turbo-Prop

SB 72-1 Jul 1988 2 M 72 Engine - Turbine interstage transition duct -Embodiment of auxiliary bracket at rear enginemounting

Applicable to HS/DH/BH 125 aircraft, Series 1A,3A, F-3B, 3A/RA, F-3B, 3A/RA, 400A, F-400B,600A, F-600B, 700A and 700B

SB 72-1 - INSP Aug 1981 - M 72 Engine - Turbine interstage transition duct -Possible inadequate weld penetration at rearmount

Applicable to HS/DH/BH 125 aircraft, Series 1A,3A, F-3B, 3A/RA, F-3B, 3A/RA, 400A, F-400B,600A, F-600B, 700A and 700B

SB 72-2 Feb 1983 1 O 72 Engine fuel and control - General - To providethe facility for using wide-cut (Avtag) fuel

All Series with Garrett TFE731-3 engine up to andincluding 700A and 700B

SB 72-3 Oct 1985 - M 72 Engine - Turbine interstage transition duct -Possible inadequate weld penetration at rearmount

Applicable to HS/DH/BH 125 aircraft with theGarrett TFE 731-3 engine, Series 1A, 3A, F-3B,3A/RA F-3B/RA, 400A, F-400B, 600A, F-600B,700A and 700B

SB 72-3853 Sep 2007 - M 72 Engine - Inspection/Replacement of Bleed AirDuct Gasket

Model 400A, Serials RK-106 through RK-353 withKit No. 128-9008-0001 installed; Model 400A(Hawker 400XP), Serials RK-354 through RK-507with Kit No. 128-9008-0001 installed; Model 400A(Hawker 400XP), Serials RK-508 through RK-518and RK-521 through RK-523.

SB 72-4 Jan 1987 - M 72 Engine - Rear mounting - Ultimate life limitationof auxiliary mounting bracket engineattachment bolt

Applicable to HS/DH/BH 125 aircraft with theGarrett TFE 731-3 engine, Series 1A, 3A, F-3B,3A/RA, F-3B/RA, 400A, F-400B, 600A, F-600B,700A and 700B

SB 72-5 Aug 1988 - M 72 Engine - Turbine Section - Replacement ofspecific serial numbered first stage LP turbinediscs installed in Garrett TFE 731-5R-1Hengines

Applicable to all Garrett TFE 731-5R-1B enginesfitted to B.Ae. 125 Series 800 aircraft

SB 72-6 Jul 1988 - I 72 Engine - Combustion System - Garrett EngineTFE 731-5 Revised Combustion System(GTEC SB.731-72-3347 REFERS)

All Series 800 with Garrett TFE 731-5R-1Hengines





ATA Chapter 73Engine Fuel and Control

SB 73-1 Sep 1965 2 M 73 To reduce the top datum on the Ultra jet pipetop temperature control system.

Series 1-521 (25/004) and 1A-521 (25/013, 014,016)

SB 73-10 Nov 1970 1 R 73 Indicating. To introduce Smith's Mod.02 to diffpressure switch.

Series 1 1A 1A-522 1A/S-522 1B 1B-5221B/S-522 1B/R-522 3A 3A/R 3A/RA 3B 3B/RA400A 400B

SB 73-11 Nov 1970 1 O 73 Differential Pressure Switch. To introduceSmith's Mod.03 to fuel pressure differentialswitch.

Series 1 1A 1B 3 3A 3A/R 3B 3B/R 400

SB 73-12 Feb 1969 - I 73 To introduce Ultra Mod.U 600 to JPT controlamplifier A3A-31.

Series 1, 1A, 1A-522, 1A/S-522, 1B, 1B/S-522,1B/R-522, 3A, 3A/R, 3A/RA, 3B, 3B/RA, 400Aand 400B

SB 73-13 Mar 1970 - R 73 Engine Top Temp Limiter. To introduce UltraMod.U854.

Model DH 125, Series 1A, 1A-522, 1A/S-522, 3A,3AR, 3ARA and 400A. Model HS 125, Series 1,1-521, 1B, 1B-522, 1B/R-522, 1B/S-522, 3B,3BRA and 400B

SB 73-14 Jun 1971 - I 73 Fuel Flow indicating. To introduce capacitors atflowmeter filter units.

Model DH 125, Series 1A-522, 1A/S-522, 3A,3AR, 3ARA and 400A. Model BH 125, Series,400A. Model HS 125, Series 1B-522, 1B/R-522,3B, 3BRA and 400B.

SB 73-15 Dec 1973 1 O 73 To introduce restrospectively thetransistorisered Elliot Dual Flow System.

Moel HS 125 Series 3B/RA

SB 73-17 May 1982 3 O 73 Engine fuel and control - AutomaticPerformance Reserve - To install A.P.R. unit,flight deck indicators, reset computers, newlimitations and to re-identify main engines

Model DH.125, Series 1A, 1A/S, 3A, 3A/RA.Model HS.125, Series 400A and 600A.

SB 73-18 Mar 1980 - R 73 To delete The APR Event Counter. All Series with TFE 731 engines up to andincluding aircraft serial number 257074, excluding25067.

SB 73-19 Jun 1980 2 O 73 Engine Fuel and Control - Indication. ScreenEarthed Cables replace non-screened cablesbetween flowmeter system signal conditionerand indicator.

All Series with TFE 731 engines up to andincluding aircraft number 257097





SB 73-2 Jul 1965 - I 73 To introduce Elliot single channel integratorunits and associated counter indicators on dualfuel flowmeter system.

Aircraft 015, Series 1B only

SB 73-20 Mar 1984 4 R 73 To improve the bonding of the enginesynchroniser signal conditioner and fuelcomputer units.


SB 73-23 Jan 1992 - M 73 Engine fuel and control - To provide additionalsupport for engine fuel pipe (Garrett servicebulletin no. TFE731-73-3107 refers)

All Series pre 800 with Garrett TFE 731-3-1H orTFE731-3R-1H engines

SB 73-3 Jul 1974 6 M 73 Installation of fuel filter differential pressureswitch on to Zone 2 cowling.


SB 73-3021 Sep 1997 - R 73 Engine Fuel and Control - Introduction ofextended LP cock and cross feed valveconnecting rods

Hawker 800 and 800XP

SB 73-3813 Oct 2007 - O 73 Engine Fuel and Control – Elimination of FuelSystem Icing Inhibitor (FSII

Kit No. 128-9009-0001 -- Model 400A Beechjet,Serials RK-106 through RK-353 with Kit128-9008-0001 installed; Model 400A (Hawker400XP), Serials RK-354 through RK-507 with Kit128-9008-0001 installed; Model 400A (Hawker400XP), Serials RK-508 through RK-529. Kit No.128-9008-0001 -- Model 400A Beechjet, SerialsRK-106 through RK-353; Model 400A (Hawker400XP), Serials RK-354 through RK-507. Kit No.128-9007-0001 -- Model 400A Beechjet, SerialsRK-106 through RK-353; Model 400A (Hawker400XP), Serials RK-354 through RK-390 andRK-392. Kit No. 128-3066-0001 -- Model 400ABeechjet, Serials RK-106 through RK-353; Model400A (Hawker 400XP), Serials RK-354 throughRK-390 and RK-392.

SB 73-3885 Jul 2008 - M 73 Engine Fuel and Control -Inspection/Modification of Digital ElectronicEngine Control/Ignition Exciter Unit Wiring

HA-0001 through HA-0049





SB 73-3888 Jul 2008 1 R 73 Engine Fuel and Control - HydromechanicalUnit (HMU) P3 Air Delivery Tubing Modification

Civil: Model 400, Serials RJ-1 through RJ-65;Model 400A, Serials RK-1 through RK-353,including airplanes which have incorporated KitNo. 128-9008 (JT15D-5R Conversion); Model400A (Hawker 400XP), Serials RK-354 throughRK-557 and RK-559, including airplanes whichhave incorporated Kit No. 128-9008 (JT15D-5RConversion). Military: Model 400T (T-1A), SerialsTT-1 through TT-180; Model 400T (TX), SerialsTX-1 through TX-13.

SB 73-3903 Dec 2008 - O 73 Engine Fuel and Control - Fuel System IcingInhibitor Elimination

Hawker 4000 Serials RC-5 through RC-22

SB 73-6 Jun 1966 - I 73 Controlling. To introduce Dowty Mod.SN299 tosynchroniser correction unit 610020009(Dowty-Rotol SB61-413).

Series 1, 1A and 1B

SB 73-8 Sep 1966 - R 73 Indicating. To introduce anti-vibration mountingon Zone 2 cowling for fuel filter diff pressureswitch.


SB 73-9 Nov 1970 1 I 73 Indicating. To introduce Smiths Mod.01 topressure switch 143/PG/ AA/4.






ATA Chapter 75Air

SB 75-1 Jul 1970 2 I 75 Introduction of mechanism Mod.Z106 toaltitude switch M2153.

Series 1, 1-521, 1A, 1A-522, 1A/S-522, 1B,1B-522, 1B/S-522, 1B/R-522, 3A, 3A/R, 3A/RA,3B, 3B/RA, 400A and 400B

SB 75-3 Jun 1977 - M 75 To delete guard lock from blow-off valveswitches.

Model BH. 125, Series 600A. Model HS.125,Series 600A and 600B.

SB 75-4 Aug 1983 1 R 75 Engine air - Nacelle Inlet Cowl Anti-icing -Possible failure of anti-icing shut off valve

Applicable to HS/DH/BH 125 aircraft with GarrettTFE 731-3 engines, Series 1A, 3A, F-3B, 3A/RA,F-3B/RA, 400A, F-400B, 600A, F-600B, 700A upto and including NA0341 and 700B up to including7200

SB 75-5 Nov 1986 - R 75 Engine Anti-icing - Cracking of bleed air pipeline

Applicable to all B.Ae 125, Series 800A and 800B

SB 75-6 Sep 1988 - I 75 Viper 601 blow-off valve operating LimitsRevised. In service instances of engine stall orsurge.

All Series 600A and 600B equipped with Viper601-22 engines

SB 75-7 May 1996 - R 75 Inspection of the LH engine intake anti-icesensor pipe for possible chafing on th P1 probesensor tube.

Applicable to all BAe 125 1000A and B, Hawker1000

SB 75-A2 Jan 1967 - M 75 Relight procedure for engine flame-out insevere icing conditions above 22.000 feet.






ATA Chapter 76Engine Controls

SB 76-2 Aug 1966 - O 76 Power Control. To introduce a revised left handpulley bracket assembly at Frame 20 A.


SB 76-3 May 1967 - O 76 To revise wire-locking for the throttle and fuelshut-off cock control con-rods in fillet.


SB 76-3480 Aug 2001 - M 76 Engine Controls - Installation of jumper wire oncomputer control switches

Hawker 800XP

SB 76-5 Feb 1970 - I 76 Engine Controls - Power Control - To introducea modified throttle link bolt


SB 76-5 - INSP Sep 1969 - R 76 Bolt attaching throttle control rod at Barometricflow control unit No1 engine - Possibility offouling.


SB 76-6 Oct 1989 - R 76 Digital electronic engine control possibleuncommanded engine acceleration.

Applicable to all BAe 125 Series 800 aircraft

SB 76-7 Oct 1992 - R 76 Engine Controls - Electronic Engine Control -To introduce PW305 engines with Pratt &Whitney SB.PW300-72- 24178

Series 1000 - Post Mod.253301A

SB 76-8 Apr 1995 - O 76 To introduce an electronic Engine Controllerwith an SCN 17 Software standard.


SB 76-9 Jan 1996 - R 76 Restricted - See Remarks Hawker 800 U-125A aircraft 258245, 258247,258250





ATA Chapter 77Engine Indicating

SB 77-1 Dec 1970 1 O 77 Tachometer. To introduce Smiths Mod.01 onK.T.D. Indicator.

Series 1A, 1B/S-522, 3A, 3A/R, 3B, 3B/R, 400Aand 400B

SB 77-10 Jun 1982 - R 77 Instruments – Engine indicating – Introductionof engine N1 R.P.M. indicator H330C andamplifier H331C

Applicable to all Series aircraft, Pre Mod 252835,with Garrett TFE 731-3 or 3R engines, up to andincluding series 700 Serial number 257190

SB 77-11 Oct 1983 1 O 77 Engine indicating - Power/temperature - Tointroduce Howell 900 Series N1 R.P.M. andI.T.T. indicators

Applicable to all Series aircraft with Garrett TFE731-3 engines, up to and including Series 700aircraft, Series 700B & Series 700A

SB 77-12 Jan 1984 - R 77 ITT indicator circuits. Defective Thermocouplecable.

Applicable to HS/BH 125 aircraf of the followingseries with Garrett TFE 731-3 engines: Series 3A,F-3B/RA, F-400B, 600A, F-600B, 700A and 700B

SB 77-14 Jul 1987 - O 77 Engine indicating - Improved routing on 'N1'flexible lead at engine foward casing

All 125 aircraft up to and including Series 700Aand 700B

SB 77-15 Nov 1994 1 O 77 Integrated Engine Instrument System. Tointroduce Engine Diagnostic System.

BAE 125 Series 1000A, Series 1000B andHawker 1000 which are Post Mod. 253364A

SB 77-16 Jan 1995 - O 77 To introduce Litton N1, N2 and ITT engineindicators for the left engine only (in-serviceevaluation).

Model HS 125, Series 700B

SB 77-17 Jun 1995 - O 77 To introduce N1 rpm indicator part No.H901-2508 providing rpm parameter for flightdata recorder system.

Model HS 125, Series 700

SB 77-18 Apr 1996 - R 77 Engine Indicating - Engine Diagnostic System -Upgrade of engine diagnostic unit (EDU)software

BAe 1000A, 1000B and Hawker 1000

SB 77-2 Mar 1966 - R 77 Temperature. To introduce provision forimproved take off leads to Jet PipeTemperature Thermocouple harness.


SB 77-3 May 1968 - I 77 R.P.M. Indicator Smiths KTD 0704W.Introduction of Smiths Mod.02.

Series 1, 1A, 1A-522, 1A/R-522, 1A/S-522, 1B,1B-522, 1B/R, 1B/R-522, 1B/S-522, 3A, 3B, 3A/R,3B/R, 3A/RA and 3B/RA.





SB 77-3210 Feb 1999 - R 77 Engine Indicating - Modification of enginediagnostic system circuitry

BAe 125 Series 1000A, Series 1000B andHawker 1000 which are post Modification No.253364A, B, C & D

SB 77-4 Oct 1970 1 I 77 To introduce Sangamo Weston ModificationÀC' to variants of Temperature IndicatorS-196-1 Parts A.B.C.D and F as detailed.

Series 1 1A 1A-522 1A/S-522 1B 1B-5221B/S-522 1B/R-522 3A 3B 3A/R 3A/RA 3B/RA400

SB 77-6 Jul 1974 2 R 77 JPT terminal blocks repositioned on inboardside of pylon web.

Model BH.125, Series 600A, Model HS.125,Series 600B

SB 77-7 Jul 1974 - R 77 Jet Pipe Temperature. Model BH.125, Series 600A





ATA Chapter 78Exhaust

SB 78-1 Nov 1986 - O 78 To introduce an improved Thrust Reverserinstallation to include indication of blockerdoors incorrectly stowed.

All H.S. 125 Series 700A aircraft with AeroncaThrust Reversers embodied to B.Ae Mod.256991B

SB 78-11 Aug 1993 - R 78 Exhaust - Inspection of thrust reverser stowmicroswitches for correct setting

Applicable to BAe 125 1000 aircraft

SB 78-12 Jan 1994 - M 78 Inspection of thrust reverser drive mechanismfor integrity

Applicable to all Hawker 1000 and BAe 125Series 1000A & B aircraft

SB 78-14 Dec 1995 1 M 78 Thrust Reverser - Introduction of upper andlower secondary locks, microswitches andwiring.

253691 Part A and Part E: BAe 125 Series1000A, 1000B and Hawker 1000 Pre. Mod.253352. 253691 Part B and Part E: BAe 125Series 1000A, 1000B and Hawker 1000 Post Mod253352.

SB 78-18 Nov 1995 - R 78 EXHAUST - To introduce modified pylons,modified outer fan ducts and thrust reverserswith secondary locks


SB 78-19 Dec 1995 - O 78 EXHAUST - To modify versers and addsecondary locks.


SB 78-2 Apr 1990 - O 78 Exhaust - Thrust Reversers - Introduction ofDee Howard Thrust Reverser System

Series 800A

SB 78-20 Dec 1997 1 O 78 To check the clearance and if necessary,increase the clearance between the thrustreverser harness connector and the thrustreverser door.

BAe 125 Series 1000 and Hawker 1000

SB 78-21 Jan 1997 - O 78 Introduction of improved thrust reverser stowand deploy switch mounting brackets andrevised rigging instructions.


SB 78-22 Jan 1997 - R 78 Engine Exhaust - Change of hardware thatattaches the thrust reverser assembly to theafterbody assembly

Hawker 800XP

SB 78-3 Apr 1990 - O 78 Exhaust - Thrust Reversers - Introduction ofThrust Reversers Throttle Box Provision

Series 800A





SB 78-3195 Jul 1998 - O 78 Thrust reverser - Stang fairing assembly -Stang tip reinforcement and rub stripinstallation


SB 78-3206 Sep 1998 - R 78 Exhaust - Thrust reverser latch actuatorreplacement

HAWKER 800 XP

SB 78-3260 Sep 1999 - O 78 Exhaust - Thrust Reversers - Replacement ofguide rod bushings in the AFT supportassembly

BAe 125 Series 1000 and Hawker 1000.

SB 78-3262 Oct 1999 - R 78 Exhaust - Inspection/Replacement of LH thrustreverser microswitch wiring

Hawker 800XP

SB 78-3445 Feb 2001 - R 78 Restricted - See Remarks Hawker 800

SB 78-3487 Mar 2004 - R 78 Exhaust - Fan Duct - Inspection and Repair Hawker 800XP Serial Nos 258266 through258544.

SB 78-3677 May 2005 1 O 78 Exhaust - Addition of Drain Holes in ThrustReverser Doors and THE NORDAM GROUPService Bulletin No. 5000BR 78-10

All Hawker 800XP, Serials 258266 through258669 equipped with TR5000BR ThrustReversers.

SB 78-4 Mar 1992 1 M 78 Dee Howard Thrust Reversers. Introduction ofCountersunk Headed Bolts at the ThrustReverser Door Hinge Pivot.

Series 800 aircraft which are Post Mod.259283C

SB 78-5 Oct 1992 - R 78 Exhaust - Thrust Reverser Hydraulics -Introduction of thrust reverser hydraulic controlvalves with revised valve components

Series 1000 Pre Mod.253485B

SB 78-6 Oct 1992 - R 78 Exhaust - Thrust Reverser - Removal of specialfeatures inhibiting operating use of thrustreversers


SB 78-7 Oct 1992 - R 78 Exhaust - Thrust Reverser - Revised method ofinvoking thrust reverse autostow


SB 78-9 Jan 1994 - M 78 Thrust Reversers. Control Circuit wiringrevisions.

Series 1000

SB A78-13 May 1994 - R 78 * Superseded by SB 29-96 BAe 125 1000A & B with Mod.253351A





ATA Chapter 79Oil

SB 79-1 Nov 1967 1 R 79 To introduce engine oil pressure indicatorSangamo Weston Part No.S149-1-582.


SB 79-2 Sep 1971 - R 79 A revised placard is introduced with increasedoil temperature limit. Indicator S149-1-629replaces S149-1-456.

Model DH.125, Series 1A, 1A-522, 1A/S-522, 3A,3AR, 3ARA and 400A. Model BH. 125, Series400A. Model HS. 125, Series 1, 1-521, 1B,1B-522, 1B/R-522, 1B/S-522, 3B, 3BRA and400B.

SB 79-3183 Nov 1998 - O 79 Oil - Removal of remote indication for enginechip detection

BAe 125 Series 800A/B.





ATA Chapter 80Starting

SB 80-1 Nov 1965 - O 80 Starting - Ignition - To introduce improvementsto the fixings of the ignitor battery tray


SB 80-2 Mar 1979 4 O 80 Starting - Cranking - To introduce optional useof fanned Starter/Generators for Aircraft withViper 521 or 522 engines fitted

Series 1A, 1B and 3

SB 80-4 Nov 1970 1 I 80 Starting - To introduce A.E.I. Modification CV1370 to Engine Starting High Energy IgnitionUnit C 44TS/1

Series 1, 1A, 1A-522, 1A/S-522, 1B, 1B-522,1B/R-522, 1B/S-522, 3A, 3AR, 3ARA, 3B, 3BRA,400A and 400B

SB 80-5 Jul 1968 - R 80 Starting - Air - To introduce a warning label inthe cockpit for engine relight and anti-icesystem


SB 80-6 Mar 1969 1 I 80 Starting - To introduce A.E.I. High EnergyIgniter Unit Type C44 TS Form 4 in lieu of C44TS, Form 1


SB 80-7 Oct 1975 - O 80 Starting - To improve the performance of theEngine Start electrical System.

Model BH.125, Series 600A. Model HS.125,Series 600B

SB 80-8 May 1978 - R 80 Starting - Engine Start H.P. CockMicroswitches - To improve operation of theH.P. Cock Microswitches in the throttle box

Model HS. 125, Series 700 and all variants

SB 80-8 - INSP Jan 1978 - R 80 Starting - Engine Start HP Cock Microswitches- Unsatisfactory engagement of operating rolleron CAM profile

Model HS. 125, Series 700 and all variants

SB 80-A3 Jan 1968 - R 80 Ignition Units and Ignitor Plugs. Temporaryrevision of proprietary overhaul periods.

HS. 125 aircraft, all series

