I!0 - MIL-STD-188everyspec.com/MIL-SPECS/MIL-SPECS-MIL-L/download.php?spec=MIL-L-25971… · 3.6.1.7 Color indicator. A plastic prism device shall be provided at the front of the

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MIL-L-2597 IB(ASG)29 MAY 1967

SupersedingMIL-L-25971A(AsG)1 December 1958

MILITARY SPECIFICATION

LIGST , AIRPORT TRAFFIC CONTROL, SDU-4/U

This specification has been approved by the Departmentof the Air Force and by the Naval Air Systems Command

1. SCQPE.

1.1 This specification covers one type of airport traffic control lightdesignated SDU-4/U.

2. APPLICABLE DO~ENTS .

2.1 The following documents, of the issue in effect cm date of invitationfor bids or request for proposal, form a part of this specification to theextent specified herein:

SPECIFICATIONS

Federal

W-C-596

Military

MIL-E-555BMIL-C-5756MIL-E-7851

MIL-C-7989

MIL-F-14072MIL-E-17555

MIL-C-25050

Connector, Plug, Electrical; Connector, Receptacle,Electrical; Plate, wall, Electrical

Ename1; Wrinkle-Finish, for Aircraft UseCable and Wire, Power, Electric, PortableEnamel; Wrinkle-Finish, for Aircraft Use,Application ofGovers, Light -Tranmnitting, for Aeronautical Lights,General Specification forFinishes f& Ground Sigml EquipmentElectronic and Electrical Equipment and AssociatedRepair Parts, Preparation for Delivery ofColors, Aeronautical Light@ and Light ing Equipment,General Requirements for

STANDARDS

Military

MIL-STD-1OO Engineecin!g DrawinS PracticesMIL-STD-105 Sampling Procedures and Tables for Inspection by

Attributes

I!0FSC 6210

Downloaded from http://www.everyspec.com

MIL-L-25971B(ASG)

MIL-STD-130 Identification Marking of US Military PropertyMIL-STD-143 Specifications and Standards; Order of Precedence

for the Selection ofMIL-STD-81O Environmental Test Methods for Aerospace and

Ground EquipmentMS3102 Connector, Receptacle, Electrical, Box MountingMS33586 Metals, Definition of Dissimilar

(Copies of documents required by suppliers in connection with specificprocurement functions should be obtained from the procuring activity or aadirected by the contracting officer. )

2.2 Other publications. The following documents form a part of thisspecification. Unless otherwise indicated the issue in effect on date ofinvitation for bids or request for proposal shall apply:

Federal Aviation Administration

FAA E 2214 Gun, Signal Light, PortableDrawings D-5056-1 Portable Signal Light Gun, ~pe w-1through -12

(Application for copies should be addressed to the Federal AviationAdministrateion, Attn: RD-420, Washington, D.C. 20590. )

3. REQUIREMENTS.

3.1 Preproduct ion. This specification makes provision for preproductioninapectlon (Bee 4.3).

3.2 Data. Unlees otherwise specified in the contract or order, no data

(oth=han reports and drawings accompanying preproduction samples) arerequired by this specification or any of the documents referenced in section2 (see 6.2).

3.3 Selection of specifications and standards. Specifications and standardsfor necesary commodities and services not specified herein shall be selectedin accordance with MIL-STD-143, except as provided in 3.3.1.

3.3.1 Uae of commercial parts. Bolts, nuts, washers, cotter pins, lockrings , and similar faatenlng,devices used for assembly, may be selected fromcommercial sources, provided military or other standard parts are notspecifically called out by this specification or associated standards. Ifsuch commercial parts are used, they shall possess suitable properties andshall be replaceable by Military Standard (MS) parts without alteration, andprovided the corresponding MS part numbers are referenced in the parts list,and, if practicable, on the contractor ‘$ drawings.

3.4 Materials.

3.4.1 Fungus-proof materials. Materials that are nutrients for fungi shallnot be used where it is practical to avoid them. When used and nothermetically sealed, they shall be treated with a fungicidal agentacceptable to the procuring activity. However, if they will be used i“ ahermetically sealed enclosure, fungicidal treatment will not be neceoeary .

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MIL-L-25971B(ASG)

3.4.2 Metals. The metals shall be as specified herein. Unless otherwisespecif-etale shall be of the corrosion-resistant type or suitablytreated to resist corrosion due to fuels, salt spray, atmospheric condit ionsor chemical reaction when installed. The use of dissimilar metals shall beavoided where practicable. When used, diesimlar metals shall be inaccordance with MS33586.

3.5 Design and construction. The light shall be designed and constructed inaccordance with FAA Drawing D-5056, and shall provide equ ivalent performanceto the light specified in FAA Specification E-2214. The light shall bedesigned to be held, aimed, and operated with one hand.

3.5.1 The light shall be constructed to withstand the strains, jars,vibrations, and other conditions incident to shipping, storage,installation, and service. The light shall be so constructed that anyneceesary repairs or maintenance can be readily made by the personnel ofoperating units

3.6 Components.

Item No.

123456789

1011121314

or overhaul bases without the use of special tonls.

The light shall consist of the following ~jor compcments:

Quantity Description See requirement

1 Housing 3.6.1.11 Principal reflector 3.6.1.21 Auxiliary reflector 3.6.1.31 Lamp 3.6.1.42 Colored filters 3.6.1.51 Cnver 3.6.1.61 Color indicator 3.6.1.71 Sighting device 3.6.1.81 Handle 3.6.1.91 Hanger 3.6.1.111 Transformer 3.6.1.121 Primary lead 3.6.1 .12.21 Secondary lead 3.6.1.12.31 Auxiliary lead 3.6.1.13

3.6.1 Details of ccnnponenta.

3.6.1.1 Housing. The optical system shall be .encloeed in a dustproofhoueing fabricated of aluminum. The housing shall be rigid and strongenough to protect and support components mounted on or within the housing.Housing dimensions shall be as specified in 3.9.

3.6.1.2 Principal reflector. The principal reflector shall be a parabolicprecision mirror of silver-backed glass. The silver coating shall beprotected by backing material and coats of paint. The reflector shall be somounted that it is not subjected to undue strains and is protected fromconcact with metal.

3.6. 1.3 Auxiliary reflector. A metal spherical reflector shall be ao mountedin the Ilght that the focus of the spherical reflector falls on the axis ofthe lamp. The overall diameter and the positionand mounting shall be such that no direct lightThe spherical reflector shall be no larger thanemission of direct light.

of the spherical reflectorfrom the lamp is emitted.necessary to prevent

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MIL-L-25971B(ASG)

3.6.1.4 L6mp. The light shall use a 50 candelas, 6-8V, RP-11 clear bulb, c-6filament~O-hour life, 7/8-inch light center length, 2-1/4 inch maximmoverall length, single-contact prefocused base lamp, American StandardaAssociation Trade No. 1501. The lmnp shall be accurately positioned at thefncus of the principal reflector and securely held in the light by a smketof the prefocus type. Unless otherwise specified, the lamp shall beinstalled and furnished with the light.

3.6.1.5 Colored filters. The light shall be provided with nne aviat ion redand one aviation green color filter. The filters shall be of clasa B,heat-resistant glaaa in accordance with MIL-C-7989. The color tranmniasionof the filters shall be type I, grade A in accordance with MIL-C-25050. Thefilters shall be correctly positioned and firmly held in the light by aholder designed to minimize breakage of the filters. When either filter ispositioned between the lamp and principal reflector, all light from the 1-incident upnn the reflector shall pass through the filter. There shall be nodirect light from the lamp.

3.6.1.6 Cover. A clear cover shall be provided at the front of the housing.The cover shall be claas D plastic in accordance with MIL-C-79E9. The colorand transmission of the cover shall he type 1, grade D, aviation white warein accordance with MIL-C-25050.

3.6.1.6.1 The cover shall be firmly held in a holder designed to fit nn thefrent of the houe ing. 1% is holder and cover assembly shall allnw quickremoval of the aasembly without the use of tools.

3.6.1.7 Color indicator. A plastic prism device shall be provided at thefront of the light to redirect a small part of the main beam to theoperator’s eye. The color indicator shall be of sufficient brightness thatan operator with normal vision can distin~ish the color of the filter in

use in bright daylight. A dimming method shall be provided to regulate thiscolor-indicating beam when the redirected light is too bright forcomfortable use at night.

3.6.1.8 Sighting device. A sighting device with front and rear sights shallbe provided along the top of the light so that the light can be properlyaimed. The centerline of the sight shall be parallel to the optical axia ofthe light.

3.6.1.9 Handie. lhe light shall be provided with a handle of such designthat the light can be held, aimed, and operated by one hand. The handle andassociated controls shall be equal to those defined by FAA SpecificationE-2214 and FAA Drawinga D-5056- I through -12, except as specified in 3.9.The following controls shall be provided:

(a) A trigger button for turning the light on and flashing it.(b) A trigger level for selecting and positioning the red or

green color filter. The red filter shall be properly positionedto provide a red signal beam when the trigger lever is in itsnorm 1, unpressed position.

(c) A trigger lever for selecting a clear signal.

3.6.1 ..9.1A handle with components different from those defined above will beconsidered satisfactory if performance ie equivalent and the design is

apprOved by the acitivity respcmaible for qualification.

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3.6.1.10 Receptacle. An MS3102A-1OSL-4P receptacleside of the llght for attaching the pwer lead.

MIL-L-25971B(AsG)

shall be provided on the

3.6.1.11 Hanger. A yoke-type hanger or other means shall be provided so thatthe light can be euapended from an overhead wire. The axis of the housingshall be essentially parallel to the ground when the light is hanging fromthe overhead wire. If a yoke-type hanger or similar device is used, it shallbe readily removable from the light.

3.6.1.12 Transformer. A two-coil isolating transformer shall be provided asa separate unit m order that the light can be operated from a commercial60-rycle} 120v snurce. The transformer shall have a minimum rating of 50 vaand shall be weatherproof. With 120V, 60-cycle current applied to theprimary, and with the specified lamp and lead installed, the transformershall supply a voltage of 7 +0 .lV at the lamp. The transformer case shallhave at least two holes for i/4-inch mounting bolts.

3.6.1.12.1 Fuse. A small fuse, enclosed so that it is waterproof, shall beprovided in= transformer secondary circuit. The fuse shall be rated at32V, 10 amp. The fuse shall be easily accessible for changing.

3.6.1 .12.2 Primary lead. The primary lead of the transformer shall be 3 feetin length and shall be permanently connected to the transformer. The cablein the lead shall be two-conductor, 16 AWC in accordance with MIL-C-5765.The lead shall terminate in a two-pole, parallel blade, attachment plug capin accordance with w-c-596.

3.6. 1.12.3 Secondary lead. The eecondary lead from the transformer to thelight shall be 20 feet in length, permanent ly connec ted to the transformerand shall terminate in a female angle plug which matches the receptacle onthe light. The cable in the lead shall be two-conductor, 16 AWG inaccordance with MIL-C-5756.

3.6.1.13 Auxiliary lead. An auxiliary lead, 10 feet in length, shall befurnished for emergency operation of the light from a battery. One end ofthis lead shall terminate in a female angle plug which uwtches thereceptacle on the light. At the other end, the cable sheath shall be removedfreeing a 12-inch length of the two insulated conductors. Each conductnr8hall terminate in a spring cl ip capable of being connected to the terminalsof a storage battery. The cable in the lead shall be two-conductor, 16 AWCin accordance with MIL-c-5756 .

3.6.1.14 Optical. The optical system shall be of the fixed, prefocus typerequiring no focusing by personnel of the operating units. Provis ions formaking adjustments during manufacture may be used if the adjustments arerigidly locked in place and will not be disturbed during routinemaintenance. All conpments nf the optical eystem shall be properly bracedand supported to prevent their getting out nf alignment.

3.6.1.15 Wiring. The light shall be completely wired and ready foroperation upon attachment of the pcwer leada.

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MIL-L-2597 lB(ASG)

3.7 Performance.

3.7.1 Operation. When tested as specified in 4.5.2, the light shall operatesatisfactorily, all controls ehall work freely, and the color filter.qandcolor indicator shall be positioned correctly . tinysticking, jtmmni”g, or ●❑alfunction shall be cause for rejection.

3.7.2 Sights. When tested as .specifed in 4.5.3, the axis of the sight shallbe no more than 1 foot from the center of the target when the target is at&OO feet, or the equivalent of 1 foot in 400 feet when the target is atanother distance.

3.7.3 Focus. When tested ae specified in 4.5.4, the center of the image asahcwn =gure 1 shall have the same spacing as the holes i“ the ~creen.

3.7.4 Photometry. When tested as specified in 4.5.5, the signal beam emittedfrom the light shall be of a circular cross section. The spread of the beamin any plane through the axis shall be not less than 1/2 degree at 180,000candelas when the specified lamp is operated at 90 spherical candelaswithout a color filter but with the clear cover in place. The spread of thebeam shall not exceed 2 degrees at 50,000 candelas. The filter colors shallmeet the requirements of 3.6.1.5.

3.7.5 High temperature. When tested as specified in 4.5.6.1, there shall beno evidence of damage and the light shall operate satisfactorily at theconclusion of the test.

3.7.6 Low temperature. When tested as specified in 4.5.6.2, there shall beno evidence of damage and the light shall operate satisfactorily at theconclusion of the test.

3.7.7 Humidity. When tested aa specified in 4.5.6.3, there shall be noevidence of damage and the light shall operate satisfactorily at theconclusion of the teat.

3.7.8 Sand and dust. When tested as specified in 4.5,6.4, there shallevidence of damage and the light shall operate satisfactorily at theconclusion of the teat.

3.7.9 Transformer temperature rise. When tested as specified in 4.5.7,temperature rise shall not exceed 65” C, and there shall be no damage to thetranaformer.

be no

, the

3.7.10 Transformer individual. When tested as specified in 4.5.8, theinsulation resistance shall be not less than 30 megohms , and the outputvoltage shall be 7 +0 .lv.

3.8 Interchangeability. All parts having the same manufacturer’s part numbershall be functionally and dimensionally interchangeable. The drawing numberrequirements of MIL-STD-1OO shall govern the changes in the manufacturer’spart numbers.

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DIMENSIONS

INlNGliES

FIGURE

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MIL-L-2597 lB(ASG)

3.9 Dimensions. The overall length of the housing shall not exceed 15 inchesand the diameter shall not exceed 9 inches. The overall height, from top ofthe housing to the bottom of the pistol grip, shall not exceed 16-1/2inches.

3.10 Weight. The weight of the light, without leads and transformer, shallnot exceed 8 pounds.

3.11 Finishes and protective coatings.

3.11.1 Unless fabricated from corrosion-resistant material, all metal partsshall be protected against corrosion with a type II finish conforming toMIL-F-14072. The following finishes shall be provided.

3.11.2 Housing exterior. The exterior eurface of the housing shall befinished with enamel conforming to MIL-E-5558, type 1, color No. 515 glossblack, and applied in accordance with MIL-E-7851.

3.11.3 Housing, interior and supporting parte. The interior area of thehousing and metal parts supporting the lamp and auxiliary reflector shall befinished with lusterless black enamel conforming to film A, designation B,

tYPe II of MIL-F-14072.

3.12 Operation markings. An instruction plate shall be permanently attachedto the outside of the housing. Brief instructions on the lamp to be used,method of changing color of the signal light, method of aiming, etc, shallbe permanently and legibly printed on the plate.

3.13 Identification of product. Equipment, assemblies, and parts shall bemarked for ldentification m accordance with MIL-STD-130 .

3.14 Workmanship. The light assembly, including all parts and accessories,shall be fabricated and finished in a workmanlike manner. Particularattention shall be given to freedom from blemishes, defects , burrs, a“dsharp edges ; accuracy of dimensions, radii of fillets, and marking of partsand assemblies; thoroughness of soldering, welding, brazing, painting,wiring, and riveting; alignment of parts and tightness of assembly screwsand bolts, etc.

3.15 Cleaning. The light assembly shall be thoroughly cleaned and loose,spattered, or excess solder, metal chips, and other foreign material removedduring and after final asembly .

4. QUALITY ASSURANCE PROVISIONS.

4.1 Responsibility for inspection. Unless otherwise specified in thecontract or purchase order, the supplier is responsible for the performanceof all inspection requirements as specified herein. Except as otherwisespecified, the supplier may utilize his own facilities or any commerciallaboratory acceptable to the Government. The Government reserves the rightto perform any of the inspections set forth in the spec ification where suchinspections are deemed necessary to assure supplies and services conform toprescribed requirements.

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oMIL-L-25971B(ASG)

4.2 Classification of inspections. The examinat ion and testing of the lightshall be classified 8s:

(a) Preproduction inspection (4.3)(b) Quality couformance inapection (4.4)

4.3 Preproduct ion inspection.

I 4.3.1 Preproduction smple. One sample unit shall be fabricated ue.ing the

Isame components, materials, and production processes as will be used innorm 1 produc tion.

4.3.2 Teats. Preproduction inspection shall consist of all the examinationand tests specified in 4.5.

4.3.3 Teat report. Upon completion of the preproduction sample inspection atest report shall be prepared in accordance with MIL-STD-831 and threecomplete copies of the report furnished to the procuring activity.

4.4 Quality conformance inspection. Quality conformance inspection shallconsist of individual and samplmg tests.

4.4.1 Individual tests. Each light shall be subjected to examinat ion ofproduct, operat ion, sights, focus , and transformer individual tests.

4.4.2 Sampling tests.

4.4.2.1 Lnt. The lot definition, formation, and size shall be in accordancewith MIL%O-105.

4.4.2.2 %npling plan. One light shall be selected at random from each lotof 100 or fraction thereof produced and subjected to the photometric test(4.5.5). The tranaforner cotqoment shall be subjected to the transformertemperature rise test (4.5.7).

4.5 Inspection methode.

4.5.1 Examination of product. The light shall be inspected to determinecompliance with the requirements specified herein with respect to materialworkmanship, and marking.

4.5.2 Operation. The light shall be operated to determine that all controlswork properly and the color filters and color indicator are positionedcorrectly .

4.5.3 Sights. The accuracy of the sighting davice of each light shall bechecked by centering the light beam upon a 3 by 3 foot target not less than400 feet fcom the light, or any ether combination of target and distantewhich presents the same angular relat ionship between the target and thelight, and observing the alignment of the sighca.

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MLL-L-25971 B(ASG)

4.5.4 Focus. Each light shall be tested to determine the accuracy of thefocusi= the oarabolic and snherical reflectors. A nlate with four holes.an ahcwn on figure 1, shall be placed over the end of the light, and a blankscreen shall be placed 4-112 feet from the plate. If the fotusing iscorrect, tbe images as shcwn on figure 1 shall have the same spacing as the ●holes in the plate. At each point on the screen, two images shall besuperimposed, one of which is caused by the spherical reflector and theother by the parabolic reflector. If the two sets of images are notsuperimposed with the correct spacing, the focusing is incorrect and thelight shall be rejected.

4.5.5 Photometry. The light shall be operated to determine photometriccompliance with light distribution requirements of 3 .7.4 and color andfilter requirements of 3.6.1.5.

4.5.6 Enviromnental. The light will be subjetted to tests in accordance withthe following specified procedures of MIL-STD-81O to determine properoperation and freedom from adverse effects resulting from environmentalexp08ure.

4.5.6.1 High temperatures. The light shall be subjetted to high temperaturetest Method 501, Procedure II, except at a temperature of 55” +2” C for 4hours. Controls shall be operated at this temperature to deter=ine thatthere ia no binding of parts or other malfunctioning.

4.5.6.2 Lw temperature. The light shall be subjected to low temperaturetest Method 502, Procedure I for 12 hours, followed immediately by operationof controls.

4.5.6.3 Humidity. The light shall be subjected to humidity test Method 507,Procedure I. exceot that the 6-hour hiah temperature DhaS.? shall be ●conducted a; 40” ~ and the relat ive hdidity’ shall be-heldduring the 6-bOur period.

at 100 percent

4.5.6.4 Sand and dust. The light shall be subjected to sand and dust testMethod 510, Procedure I.

4.5.7 Transformer temperature rise. When subjected to a heat rise teat,conducted by connecting the pruuary to a 120-volt, 60-CPS power source andloading the secondary with a resistive load drawing 7.0 ~0. 1 amperescurrent, the temperature rise after 1 hour continuou8 operation, determinedby the resistance method, shall not exceed the requirement as specified in3.7.9.

4.5.8 Transformer individual. The secondary output voltage at the lamp shallbe checked to determine that it is within the tolerance specified in 3.7.10.The dielectric strength of the transforwr shall be tested by applying apotential of 1,000V rms, 60 cycles for 1 minute between windings and betweeneach winding and core, and measuring the insulation resistance.

4.5.9 Inspection for delivery. The lights shall be inspected to determinethat preservat ion, packaging, packing, and marking are in accordance withsection 5.

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IMIL-L-25971B(ASG)

5. PREPARATION FOR DELIVERY.

● 5.1 Preeenation, packag ing, packing, and marking. All items of theequipment shall be preserved, packaged, packed, and marked in accordance

with MIL-E-17555 for the level of .shiptent specified in the contract ororder (ace 6.2).

6 NOTES.

6.1 Intended use. The lights are intended to be used in permanent or mobileair-traffic control twera to control air trciffic in the event radiotranmniasion is not available.

6.2 Ordering data. Procurement documents shcwld specify:

(a) Title, number, and date of this specification.(b) Data requirements (see 3.2).(c) Preproduction requirements (see 4.3).(d) Level of preservation, packaging, packing, and marking (see 5.1).

Custodians:Navy - ASAir Force - 11

‘oReviewer activities:Navy - ASAir Force - 11

*U.S. GOVERNMENT PRINTING OFF, CE8 lS#Z-SaS-O1, /, S,,I

11

Preparing activity:Air Force - 11


L‘“””””””””””””””-”.mANDARDIZATION DOCUMENT IMPROVEMENT PROPOSAL 1

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INSTRUCI’IONS: l%ii fm u provided to solicit beneficial COIIIIIMIJUwhich may improve this document mdenhance ib use. DoD contracts, governmentmtivitiet,manufactumn,.vendors,orotherprospectiveIU.?mofthedocument are invtti ta submtt comments to the government. Fold on lines on reverie tide, ttaple in corner.uld send ta preparing activity. Attach any pertinentdata wbkh maybe of w in improvingthisdocument.Iftheream additionalpapers,attachtoformand place both in an envelope addressed to preparing actity. A-IISS will be provided to the submitter. when name and addresu u provided, within 30 days indicating thatthe 1426 WM received and when any appropriate action on it witl be completad.NOTE: ‘l%& form shafl not be wed to submit mqusts forwaken,deviations or clarification of specifkation~Uhllld# on CUtTait cOlltncfd. timlllellb mbntitted OD tbil brlri do llOtCOnstitllmOFilllp]yaUtbOti~tiC.11towaiveanyportionofthemferencsddocument(s)o?toamendcontitual~uiremenm.

‘CUMEN7 10ENTIFIER (Numti,) AND TITLE

kmrB-1522sF - RED, SUNK, FcuND luEE,sINGLE AND txximE-DmKME OF OIEOAN1ZATION AND ADDRESS OF SUBMITTEn

I VENOOFI O uSER ❑ MANUFACTURER

❑ HAS ANY pART OF THE 00CUMENT CREATED pR00LEM9 OR REaul REO INTERpuE7AT10N IN PROcUREMEiT

s? ❑ 1SANV PART OF IT TOO RIGID. RESTI?ICTIVE, LOOSE OR AMBIGUOUS? PLEASE EXPLAIN BELOW.

A. OlvE pAFIAGRApH NuMOER AND WOFIDIN13

B. RECOMMENDED WORDING CMANQE

C. REASON FOR RECOMMENOEO CHANOEISl

IEMARKS

Ml -0 BY (fit-d w tyn,d IMnU amdddn. - OIIHond) YE LEPHONE NO.

bATE

I,— . . . .J,;. 14~~

EOITION OF 1 JAN 72 WILL ❑E USED UNTIL EXHAUSTED.


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I!0 - MIL-STD-188everyspec.com/MIL-SPECS/MIL-SPECS-MIL-L/download.php?spec=MIL-L-25971… · 3.6.1.7 Color indicator. A plastic prism device shall be provided at the front of the