MOONEY AIRPLANE COMPANY, INC. SERVICE BULLETIN...T1819M4 CABLE TIE (SMALL) 12 MOONEY AIRPLANE COMPANY, INC. Louis Schreiner Field, Kerrville, Texas 78028 tel: 830-896-6000 SXMA MRTI

MOONEY AIRPLANE COMPANY, INC. SERVICE BULLETIN

Louis Schreiner FieldKerrville, Texas 78028

MOONEY AIRPLANE COMPANY, INC. Louis Schreiner Field, Kerrville, Texas 78028 tel: 830-896-6000 www.mooney.com

THIS BULLETIN IS FAA APPROVED FOR ENGINEERING DESIGN

SERVICE BULLETIN M20--296Date: June 18, 2007

SUBJECT: Circuit breaker panel wiring -- removal and replacement procedure.

MODELS/ SN M20R: 29-0475 thru 29-TBAAFFECTED: M20TN: 31-0032 thru 31-TBA

TIME OFCOMPLIANCE: Within the next 10 hours of Flight

INTRODUCTION: The circuit breaker panel has been revised to remove and replace the specified wires in this Ser-viceBulletin according toMooneyEngineeringGroup. The removedwires are smaller gaugeandneed to be replaced by a larger gauge to handle proper electrical current load.

INSTRUCTIONS:Read entire procedures before beginning work.1-1. Turn master switch -- OFF1-2. Remove LH and RH Tailcone access panels. and disconnect batteries.1-3. Remove&slide out Circuit Breaker Panel andTrayAssembly. Refer to specific Service &Mainte-

nance Manual chapter 39--10--03 for removal and installation:a.) From under dash area remove any cable ties from headliner, landing taxi, circuit breaker har-

nesses and disconnect connectors (AMP connectors) to allow tray to slide out.b.) Remove screws (2) from face of circuit breaker panel at upper right and left edges and from bot-

tom mounting screws (2) at hinge assembly (ref. Figure SB M20-296-9).c.) Remove outer mounting nut for the “Music Jack” on face of CB Panel and push inward to allow

CB Panel to slide out (ref. Figure SB M20-296-9)d.) Panel should now tilt down to access the tray assembly mounting screws (2). Remove the two

screws from tray assembly. These screws have (2) bushings thatwill releasewhen trayassemblyis removed. (ref. Figure SB M20-296-9)

e.) From under dash area slide tray out enough to removemounting screws (2) and separate POSI-TRONICSt connector located on backside of tray assembly (ref. Figure SB M20-296-9)

f.) Disconnect Alternator wire by removing mounting nut on top of tray assembly (ref. Figure SBM20-296-9, 10).

-CAUTION-USE CARE WHEN REMOVING CIRCUIT BREAKER TRAY ASSEMBLY, CONNECTOR TABS ON THE

RECTIFIER BRIDGE ARE FRAGILE AND CAN BE BROKEN WITH EXCESSIVE FORCE AND BENDINGWIRE CONNECTIONS.

g.) Panel should now be free to slide out, note the (2) bushings between tray assembly and tubularstructure will release and possibly drop out (ref. Figure SB M20-296-9).

NOTE:THE CONTROL WHEEL WILL HAVE TO BE PULLED AFT TO REMOVE TRAY ASSEMBLY

1-4. With circuit breaker/tray assembly on workbench, remove top tray assembly screws (4) to gainaccess to the Emergency Bus Relays (ref. Figure SB M20-296-11).

1-5. Locate and remove jumper wire number SA10A14 and replace with (braided) jumper wire num-ber SA10A10 from the7.5Circuit Breaker to 30ampCircuit Breaker (ref. FigureSB M20-296-1,2& 3).

1-6. Locate and remove wire number SA08C14 with AMP extractor tool 91019--3 and replace withwire number SA08C10 from 30ACircuit Breaker to Headliner RC03BConnector Pin “2” (ref. Fig-ure SB M20-296-1, 2).


1-7. Locate and remove wire number SA12A16 and replace with wire number SA12A12 from 5ACir-cuit Breaker to the Emergency Bus Relay (R1). Release the relay locking tabs during procedure(ref. Figure SB M20-296-1, 4, 7, 11).

1-8. Locate and remove wire number SA11A16 Assy (daisy chain) and replace with wire numberSA11A12 Assy (daisy chain) from 20A Circuit Breaker to the Emergency Bus Relay (R2) andjumper wire to Emergency Bus Relay (R1). Release the relay locking tabs during procedure (ref.Figure SB M20-296-1, 5, 7, 11).

1-9. Locate and removewire number SA11A16 and replacewith wire number SA11A12 from 20ACir-cuit Breaker to the Emergency Bus Relay (R1). Release the relay locking tabs during procedure(ref. Figure SB M20-296-1, 5, 7, 11).

1-10. Locate and remove wire number SA23A16 Assy and replace with wire number SA23A12 Assyfrom Rectifier Bridge (D1) to the Emergency Bus Relay (R2) and daisy chain wire numberSA15A20 to the PL104APOSITRONICStConnector Pin “B”. Use a POSITRONICSt connec-tor pin extractor tool #9081--0--0 Rev.L to remove wire terminal from connector (ref. Figure SBM20-296-6, 7 & 8).

NOTE:

EACH POSITRONICSt PIN WILL HAVE AN EMBOSSED LETTER ASSIGNMENT, REFER TO FIGUREM20--296--8 TO CORRECTLY IDENTIFY PIN “B” ASSIGNMENT BEFORE REMOVING WIRE.

1-10. Install any spiral wrap on wires if removed, cable tie wires in place as required.

1-11. Install Circuit Breaker Panel back in reverse order as in procedure 1--3 above.

1-12. Connect batteries and replace LH and RH Tailcone access panels.

1-13. Turn master switch -- ON.

1-14. Verify proper operation of electrical equipment.

1-15. Complete log book entry for procedure.

1-16. Return aircraft to service.

1-17. Procedure complete.

WARRANTY: Mooney Airplane Company, Inc. will warrant labor (approximately 4 hours), when done in accor-dancewith theprocedures of this ServiceBulletin for aircraft currently coveredunder theMooneyAirplane Company, Inc. factory warranty program.

REFERENCEDATA: MAC Service & Maintenance Manual (applicable A/C)

PARTS LIST: Mooney Airplane Company, Inc., Parts Kit P/N: M20--296--001Item P/N Description Qty

1. RM204273 2170 ALPHA WIRE BRAID 0.375 FT2. 919026-044/20 WIRE 20 AWG WHITE 1.5 FT3. 919026-044/12 WIRE 12 AWG WHITE 4.6 FT4. 919026-044/10 WIRE 10 AWG WHITE 2.5 FT5. 66259-2 SOCKET, CONTACT 10-08 16. MS25036-156 TERMINAL #8 12--10 AWG 27. R5106NT TERMINAL #6 12--10 AWG 28. 26A1348C TERMINAL P & B 69. MS20659-140 TERMINAL #8 8 AWG 110. 640907-1 TERMINAL 111. FC120N2 SOCKET -- POSITRONIC IND. 112. 1N2483 DIODE RECTIFIER 113. T50L9M4 CABLE TIE (LARGE) 1214. T1819M4 CABLE TIE (SMALL) 12


S XAMMR TNETTI

MA3TNIA5 EP

V41 O STL

DLEIHS

STHERALG

GILNAP LE

LANDINGGEAR

PUSHGEAR SAFETY

BYPASS

EXTENDEDGEAR NOT

GEAR DOWN

165 KIAS140 KIAS

GEAR EXTD

GEAR UP106 KIAS

ELT

TRIMRUDDER

TRIMELEVA/P

POWERHIGHBOOST PUMP

BOOSTICELITE HEAT

PITOT

1/2BATT

BUSEMER

ALTRT/LT

POWERMASTER

WARNMSTR

S--TEC

APRNAVHDG

FIFTY FIVE X

VSALTREV

FEET100

2300

3302301

876 5 4

9 0 1

6080KNOTS

AIRSPEED

20

40

100120140160

200180

REMOVESA10A14

REPLACE WITHSA10A10

REMOVESA08C14

REPLACE WITHSA08C10

TO HEADLINERRC03B - PIN “2”

REMOVESA11A16

REPLACE WITHSA11A12

REMOVESA11A16 ASSY

REPLACE WITHSA11A12 ASSY

REMOVESA12A16

REPLACE WITHSA12A12

TO EMERGENCYBUS RELAY (R2)



ALSO REFER TOCOMPONENT LAYOUT

NOTE:

FIGURE M20--296--8

(DAISY CHAIN)

(DAISY CHAIN)

MUSIC JACK

VIEW SHOWINGBACKSIDE OF PANEL

REMOVE NUT AND PUSH IN

REFER TO NOTEON FIG. M20--296--4

ALSO

Figure SB M20-296-1 -- CIRCUIT BREAKER PANEL (BACKSIDE OF PANEL)


REMOVE

SA10A14

REPLACEWITH

SA10A10

REMOVE

SA08C14

REPLACEWITH

SA08C10

SEEFIGURE

M20--296--3

BRAIDEDJU

MPER

Figure SB M20-296-2 -- WIRING SCHEMATIC


REMOVE

SA10A14

REPLACEWITH

SA10A10

SEEFIGURE

M20--296--2

BRAIDEDJU

MPER



REMOVE

SA12A16

REPLACEWITH

SA12A12

SEEFIGURE

M20--296--7

NOTE:

SomeInstallationswillhavewireSA12A12

attached

tothe

STBY--G

YROC/B

Buss.TheCircuitBreaker

will

havea

braided

jumper

wireattachingto

theAHRSC/B

Buss

SEENOTEBELOW



REMOVE

SA11A16

ASSY

REPLACEWITH

SA11A12

ASSY

REMOVE

SA11A16

REPLACEWITH

SA11A12

SEEFIGURE

M20--296--7

SEEFIGURE

M20--296--7

(DAISYCHAIN)

(DAISYCHAIN)



REMOVE

SA23A16

ASSY

REPLACEWITH

SA23A12

ASSY

SEEFIGURE

M20--296--7

(DAISYCHAIN)

(DAISYCHAIN)



REMOVE

SA12A16

REPLACEWITH

SA12A12

REMOVE

SA11A16

REPLACEWITH

SA11A12

REMOVE

SA23A16

ASSY

REPLACEWITH

SA23A12

ASSY

REMOVE

SA11A16

ASSY

REPLACEWITH

SA11A12

ASSY S

EEFIGURE

M20--296--6

ALSOREFERTO

COMPONENTLAYOUT

NOTE:

SEEFIGURE

M20--296--5

SEEFIGURE

M20--296--5

SEEFIGURE

M20--296--4

(DAISYCHAIN)

(DAISYCHAIN)

(DAISYCHAIN)

(DAISYCHAIN)



TOHEADLINER

RC03BPIN

“2”

PIN

“B”

REMOVEPIN

USING

POSITRONIC

PIN

REMOVER

VIEW

LOOKINGDOWN

FRONTOFAIRCRAFT

(VIEW

ROTATEDFORCLARITY)

CIRCUITBREAKER

D1

D2

STA

NDBYRELAYS(R1&R2)

TRAYASSEMBLY

ALTERNATO

RWIRE

CONNECTION

PANEL

PL37A

RC03B

LND/TAXI

G1000

RC038

HDLNR

RECTIFIERBRIDGE

BOTHD1&D2P/N

FB5006

AMMETERSHUNT

MOUNTING

SCREWS(2)

MOUNTING

SCREWS(2)

Figure SB M20-296-8 -- COMPONENT LAYOUT


TRAYMOUNTING

SCREWS(2)

WASHERS(2)

BUSHINGS(2)

SCREWS(2)

WASHERS(2)

REF:TUBULARFRAME POSITRONIC

CONNECTOR

(SIDEVIEW)

FRONTOFAIRCRAFT

TILTTRAYASSEMBLY

REF:HINGEASSEMBLY

MUSIC

JACK

REMOVENUT

DISCONNECTFROM

UNDERDASHAREA

(2)SCREWS

HEADLINER

CONNECTOR

DISCONNECTFROM

UNDERDASHAREA

REMOVE-BOTTOMC/B

PANEL

REMOVE

ALTERNATOR

NUT

REMOVE

REF:TRAYASSEMBLY

REF:RECTIFIER

BRIDGE

(PUSHIN)

SCREWS(2)

WASHERS(2)

REMOVE-TOPC/B

PANEL

TOPOFTRAY

REMOVE

TOACCESS

RELAYS

Figure SB M20-296-9 -- CIRCUIT BREAKER TRAY - SIDE VIEW


REMOVE C/B PANELTOP SCREWS (2)

REMOVE ALT WIREFROM TRAY ASSEMBLY

REMOVE C/B PANELBOTTOM HINGESCREWS (2)

Figure SB M20-296-10 -- CIRCUIT BREAKER - TRAY REMOVAL


RELEASE RELAYLOCKING TABS

AMP CONNECTORS(HEADLINER)

(CIRCUIT BREAKER)(LANDING LIGHTS)

REMOVE TOP OFTRAY (4) SCREWSTO GAIN ACCESS

TO RELAYS

Figure SB M20-296-11 -- EMERGENCY BUS RELAYS

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MOONEY AIRPLANE COMPANY, INC. SERVICE BULLETIN...T1819M4 CABLE TIE (SMALL) 12 MOONEY AIRPLANE COMPANY, INC. Louis Schreiner Field, Kerrville, Texas 78028 tel: 830-896-6000 SXMA MRTI