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MIL-E-5400T&##!#l&79MIL-E-5400R31 October 1975Supersessiondata(see 6.8)MILITARY SPECIFICATIONELECTRONICEQUIPMRNP,AIRBORNE, GSNERAL SPECIFICATIONFORThis specificationis approved for use byall Departmentsand Agencies of the Department of Defense.1.,.SCOPE1.1&9J2z. This specification covers the general requirements for airborne electronic eauipment for operation primarily inpiloted aircraft. The detail perfo suce and tes requirementsfor aparticular equipmentshall be as specifiedin the detail specificationforthat equipment.1.2Classification. The electronic equipment for whichthe general requirementsfor design and manufactureare.outlined shall beof the followingclasses,as specified (see 6.2):class 1.,.-Equipmentdesigned for 50,000 ft. altitudeand contiguoussea level operationoverthe temperaturerange of -54 to 55 C( 71 C intermittentoperation).Claas 1A -Equipment designed for 30,000 ft. altitudeand continuoussea level operationoverthe temperaturerange of -548 to 55 C( 71 C intermittentoperstioii).Clsss lB -EauiDmentdesimedfor 15,000 ft. altitude. .and continuoussea level operationover”’the temperaturerange of -40 to 55 C( 71 C intermittentoperation).,, .,, .,Beneficial cements (recommendations,additions, deletions) and anYpertinent data which ay be of use in imp.roviugthis docnment shouldbe addressed to Con&nding Officer, Naval Air Engineering Center,Engineering Specifications and Standards Depar ent (COde .931!)!Lakehurat, NJ 0s733 by using the self-addressedStandardlzatlOnDocument ImprovementProposal (DD Form 1426) appearing at the end ofthis document or by letter.FSC GDRQ

MIL-E-5400Tclass 2-Equipmeutdesignedfor 70,000 ft.altitudeaud continuoussea level operationoverthe temperaturerange of -54” to 71”c( 95 Cintermittentoperation).class 3 -Equipmeutdesignedfor 100,000ft. altitude and continuoussea level operationover the temperaturerauge of -54” to 95 C ( 125 C intermittentoperation).class 4 -Equipmentdesiguedfor 100,000ft. altitude and continuoussea level operationover the temperaturerauge of -54” to 125 C ( 150 Cintermittentoperation).1.2.1Externalcooling. The addition of the letter ‘lX1’after the clasa number, e.g. (Clasa 2X), will identifythe equipmeutasoperatiugin the ambientenvironmentof that class,but requiringcooling,from a source externalto the equipment.2.,.*APPLICABLEDOCUMSNTSIssuesof do&unents. The documeutalistedin Appendix “!2.1A of the issue in effecton the date of invitationfor bida or requestfor.:proposala,form a psrt of this specificationto the extent specified‘herein.Requirementsof MIL-STD-454 invoked by this specificationarelimitedto those docm,entsappearingin AppendixA.DOCUMENTSISee AppendixA(Copiesof specifications,standards,drawings,and publicationsre:quired by contractorsin confectionwith apecific procurementfwnctiona.shouldbe obtsinedfrom the procuringactivityor aa directedby the alsand processes. Parts,materials,and3!1processes shall conform to applicable documents listed in Appemdix A.3.1.1Selectionof parts and materials. Parts and materialscoveredby documentslisted in AppendixA are standardand shall.be usedwhenever they ire suitablefor the purpose.Parts and materialashall beprocured from QPL sourceswhen qualificationis a requirementof the partor materialapecification. Nonstandardparta and materialsmust be equiv- alent to or better than similar standardpsrts and materials. Parts se- ‘lection aud controlshall be in accordancewith MIL-STD-454,Requirement2

MIL-E-5400T22. ‘ When AppendixA fails to pr&ide an applicablematerial specificationor standard,the contractorshall use other.establishedspecificationsorstandardsin the order of precedenceset forthin f’fIL-STD143. Materialaselectedfrom otier than AppendixA are not standard,and approvalmust.beobtainedprior to their use in equipment. Each vendor source for a nonstandard‘partor material,requiresapproval.3.1.1.1&roval of nonstandardparts and. aterials. In considering the approval of nonsumdard parts and.materials,,contractsforelectronicequipmentare dividedinto the folIotvingcategor es:CategoryI:Contracts which are fundamentallyforthe purpose of investigationor studyand.not for the fabricationof equipment.Category11:Contracts for one or more models of.equipmentdesignedto meet the performance requirementsof a specificationorto establishtechnicalrequirementsforproduction equipment. This categoryincludescontractsfor models to be “usedfor-test under setiice conditionsforthe evaluationof their suitability“andperformance.CategoryIII: Contractsfor productionequipment. Thesecontractawill usnillyincluderequirements for a prototypeor prepr?ductionmodel:Contractsunder Category1. Approval of nonstandard3:1.1.1.1parts and materialsshall not be requiredunder contractsor orderswhichfall nuder Category1.*3.1.1.1.2Contractsfor equipment.which fall under CategoriesIIand III. A requestfor the approvalof the use of nonstandardparts andm-is’,except‘formetals,shall be”submittedin accordancewith applicable paragraphsherein. For a single contractcoveringlike”equipmentswhich fall in both “Categories11 and 111, parts and materials‘approvalshallbe requiredonly for those items used in Category.11equipments,andany new item sourcesor new nonstandardit”ms”used in CategoryIII equipments.Approvalof all nonstandardparts and materialsused in the equipmentshallbe obtainedby the contractor’.prior to deliveryof any equipmentrequiredby the contract.*Reorderedp oductionequipment. A designreviewdirected3.1.1.1.3”toward replacementof nonstandard.parts and materialswith standardPartsand materials shall be .pe fo ed on contractsfor reorderedequipment,whetherreorderedfrom the origiualcontractor’or from a differentcontractor.-.3

MIL-E-54ooTChangesmust conformto interchangeabilityrequirements.The originalpartprocured from the same source,when requiredby interchangeabilityor lackof a standardreplacementpart, may be used withoutreapproval.3.1.1.1.3.1Continuationof production. In those cases ntinuousproductionby the samecontractor,a review directed toward nonstandardparts replacementwithstandardparta shallnot be required.,.*The3,1.1.1.4Time scheduleof msterialapprovalrequests.request for approvai of nonstandardmaterialsshall be made at the .tirs that the material ia selectedfor uae in the equipment, The Governmentretains the right to request changesto the material,if the performsnce,description,teat data, or inspectionof the material indicatesthat thematerialwill not performita intendedfunction,*3.1,1.1.5Samplesrequiredfor parts and materialapprovals.Sampleaof nonstandardparta and materi.alamay be requiredby the procuringactivity.These samplesshallbe submittedin quantitiesand to the destination apecified by the procuringactivityfor tests and examination, Samplequantitiesto be specifiedwill not exceed 1 ounce or 6 square inches ofany materislor 3 feet of wire or 3 units of any other part, excepttransform- ;ers, microcircuits,delay lines,blowers,and power tubes such aa magnetrons .and klystrons,where 1 unit is aufficient. Sampleparts and materialsmaybe testedto destructionby the procuringactivityand will not be returnedto the contractor,When there ia more than one supplier for a part orinaterial,parta or materiala from each suppliershall be consideredforseparatesubmission.Uae of militarypart identifiers. Parts which require3.1.1.2QPL approval,but which have no qualifiedvendors,shall not be identifiedwith militarypart numbers.Choiceof parts and materials. Wheneveran applicable3.1.1.3specificationprovidea ore than one characteristicor tolerancefor anitem, the equipment manufacturershall use in the equipment,items ofbroadestcharacteristicsand of the grestestallowabletolerance that willfulfill the performancerequirementsof the equipment. When acceptableitama of higher than miuinnuaqualityare readilyavailable,the utilizationof which would not increasethe initialor life cycle coat to tbe procnringactivity,they may be used. When aximum physicaldimensionsof an ‘itemare indicatedin the applicablespecificationfor the item, all new equipmentshall be designed to accommodatethe maximum physical size specifiedinorder that all parts having the same type designationwill be physicallyinterchangeablein the equipmeut.3.1.1.4Replaceabilityby standardparts and materiala. Whenever permissionis grantedby the procuringactivityfor a contractorto useitems not in accordancewith standard specificationsfor which approved4.

MIL-E-5400TProducts exist. onlv because of nonavailabilityof standard items, the;ontractorsha l arr nge the equipmentto permit replacementin the fieldof the nonstandardby the standard items. The standard item shall belisted in the technicalmanuals as the preferredreplacement.Equipmentperformance. The requirementsof this speci3.1.1.5ficationwith regard to the use of parts, materials,and procesae ,eitherstandard or approvednonstandard,shall not relievethe contractorof theresponsibilityfor complyingwith all equipmentperformanceand other requirementsset forth in the detail equipmentspecification,or contract.Approvalsfor nonstandardparts and materialsare contingent.on onand qualityconformancetestsand other requiredequipmenttests.*3.1.1.6Substitutionof parts. The selectionand applicationof substituteparts shall be h accordancewith MIL-STD-454,Requirement72.*3.1.2Capacitors: Capacitors shall be in accordancewithHIL-STD-454,Requirement2.3,1.3Metal castings. Metal castingsshall be in accordancewith s. Electricalconnectorsshall bein accordancewith MIL-STD-454,Requirement10. 3.1.4.1Mountingof electricreceptacles. Where practical,when receptaclesare mounted.on a verticalsurfacethe largestpolarizing.or prime key or keyway of the receptacleshall be at the top centerof theshell of the receptacle.3.,1.4.2Adjscent locations. The use of identicalconnectorsinadjscent locationsshall be avoided. When the:use of comectors of thesame shell size.in adjscent locationscannot be avoided,differencesinkeying arrangementshallbe used to preventmismating.Controls3.1.5STD-454,Requirement ”*3.1.5.1Controls shall be in accordancewith MIL-Deleted.—.3.1.5.2Tuning dials. uning dials khaIl be in trolpanels. Controlpanels.shall conformto MIL-C6781. The design shall be approved by the procuring activityprior tofabdication.“Thisdesign approval’applies to panel layont only and doesnot authorizeuse of nonstandardparts on the panel.5