1、oMILITAKY SPECIFICATIONINDICATORS , RATii OF FLOW, FUELThis specification is approved for useMIL-I-83026D15 February 1990SUPERSEDINGMIL-I-83026C27 MAY 19i7by all Department and Agencies of theDepartment of Defense. 1. Scope1.1 += This specification covers the requirements for certain types ofhermeti
2、cally sealed integrally lighted indicators for indicating the flow rate ofengine fuel in pounda per hour (pph). The indicators are designed to be compatiblewith a particular trans!nitter which provides the proper signal format and range forthe specific indicator.1.2 Classification. Indicators shall
3、be of the following types, as specified (see6.2): -a71 Basic Repeater Integral Flow Range- Type Light ing (PPH)liFU-2b/A-7 EFL1-43/A-7 Red 0-15,000EFu-26/A-8 ELW-43/A-tI White 0-15,000tiFu-26/A-13 EFu-43/A-13 White 0-15,000tienetlcial comments (recommendations, additions, deletions) andany pertinent
4、 data which may be of use in improving this documentshould be addressed to: Oklahoma City Air Logistics Center/MMEOR,Tinker AFB OK 73145-5990 by using the self-addressed StandardizationDocument Improvement Proposal (DD Form 1426) appearing at the end ofthis doc rneu nt or bv lett er.AMSC N/A FSC 662
5、0DISTRIBUTION STATEMENT X. Distribution authorized to U. S. Government agencies andprivate individuals o=terprises eligible to obtain export-controlled technicaldata in accordance with regulations implementing 10 U.S. C. 140c, 13 April 1988.Controlling DoD office is OC-ALC/MiWOK, Tinker APB, OK 7314
6、5 -5 Y90WAKNING-This document contains technical data whose export is restricted by the ArmsExport Control Act (Title 22, U.S. C. , Sec. 2751 et se%) Executive Order 12470.Violations of these export laws are subject to severe criminal penalties.a71 lltiSTKUCTIN NOTICE. For classified documents, foll
7、ow the procedures in DoD#tih%$#l? prevent disclosure of contents or reccmstruction of theecurit y Manual, Section 11-19 or DoD 5200. I-R, Informationdocument.Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-I-83026D2. APPLICABLE DOCUMENTS2.1 Gover
8、nment documents.2.1.1 Specifications, standards, and handbooks. Tbe following specifications,standards, and handbooka form a part of this document to the extent specifiedherein. Unless otherwise specified, the issues of these documents are those listedin the issue of the Department of Defense Index
9、of Specifications and Standards(DODISS) and supplement thereto, cited in the solicitation (see 6.2).SPECIFICATIONSFederalPPP-B-601PPP-B-636MilitaryMIL-P-116MIL-E-5400MIL-s-7742MIL-C-14806MIL-L-25467MIL-C-26482MIL-L-27160MIL-B-27497MIL-T-83027STANDARDSFederalFED-STD-595MilitaryMIL-STD-1OOMIL-STD-129M
10、IL-STD-130MIL-STD-454MIL-STD-461MIL-STD-462MIL-STD-701MIL-STD-704Boxes, Wood, Cleated PlywoodBox, Shipping, FiberboardPreservation, Methoda OfElectronic “Equipment, Airborne, General SpecificationForScrew Threads, Standard, Optimum Selected Series:General Specification ForCoating, Reflection Reducin
11、g, For Instrument CoverGlasses And Lighting WedgesLighting, Integral. Aircraft Instrument, GeneralSpecification ForConnectors, Electric, Circular, Miniature, QuickDisconnect, Environment Resisting, GeneralSpecification ForLighting, Instrument, Integral, White, GeneralSpecification ForBearinga, Jewel
12、, Sapphire or Ruby, SyntheticTransmitter, Rate Of Flow, Fuel Tru-98/AColorEngineering Drawing PracticesMarking For Shipment And StorageIdentification Marking Of US Military PropertyrStandard General Requirements or Electronic EquipmentElectromagnetic Interference CharacteristicsRequirements For Equi
13、pmentElectromagnetic Interference Characteristics,Measurement OfLists Of Standard Semiconductor DevicesElectric Power, Aircraft, Characteristics AndUtilizations Of a71 “2Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-I-83026Do MIL-sTD-781MIL-STD
14、-81OCMIL-STD-882MIL-STD-889MIL-STD-970MIL-STD-2073-1MS3113Ms3126MS33558.MS33585MS33639BANDBOOKSReliability Tests Exponential DistributionEnvironmental Teat MethodsSystam Safety Program For Systems And AssociatedSubs taystems Arid Equipment: Requirements ForDissimilar MetalaStandards And Specificatio
15、ns, Order Of Preference ForThe Selection OfDoD Material Procedures For Development And ApplicationOf Packaging RequirementsConnectors, Receptacle, Electric, Solder Mountf ng,Miniature Bayonet CouplingConnector, Plug, Electric, Crimp-Type, Straight,Bayonet CouplingNumerals And Letters, Aircraft Instr
16、ument Dial,Standard Form OfPointers, Dial, Standard Design Of Aircraft Irist rumentCases, Instrument, Clamp-Mounted, AircraftAFSC Design HandbookDH 1-6 System Safety(Unless otherwise indicated, copies of federal and military specifications,a71 standards and handbooks are available from the Naval Pub
17、lications and Forma Center,(ATTN: NPODS), 5801 Tabor Avenue, Philadelphia, PA 19120-5099).(Copies of MIL-STD-81OC is available from Director, Naval Publications and PrintingService Off ice, 700 Robbins Ave Bldg 4 Section D, Philadelphia PA 191 11. )2.2 Non-Government publications. The following docu
18、ment(s) form a part of thisdocument to the extent specified herein. Unless otherwise specified, the issues ofthe dncuments which are DoD adopted are those listed in the issue of the 00DISScited in the solicitation. Unless otherwise specified, the issues of documents notlisted in the DODISS are the i
19、ssues of the documents cited in the solicitation (see6.2).American Society For Testing And Materials (ASTM)ASTM D3951 Packaging, Commercial(Application for copies should he address to: ASIY, 1916 Race St, Philadelphia, PA19103. )(Non-Government standards and other publications are normally available
20、 from theorganizations that prepare or distribute the documents. These dncumenta alao may beavailable in or through libraries or other informational services. )2.3 Order of precedence. In the event of a conflict between the text of this detailand the references cited herein (except for related assoc
21、iated detailospecifications, apecif ication sheets, or w standards), the teat Of this dOcumenttakes precedence. Nothing in this document , however, supersedes applicable lawsand regulations unless a specific exemption ,has been obtained.3Provided by IHSNot for ResaleNo reproduction or networking per
22、mitted without license from IHS-,-,-MIL-I-83026D3. REQUIREMENTS3.1 Qualification. Indicators furnished under this specification shall he products a71which are authorized by :he qualifying activity for listing on the applicablequalified product list at the time of award of contract (see 4.4 and 6.5).
23、3.2 Selection of standarda and specif icationa. Standards and specifications fornecessary commodities and services not specified herein shall he selected inaccordance with MIL-STD-970.3.3 Preliminary list of electronic parts. A preliminary list of electronic partsshall be furnished directly to the c
24、ontracting activity in accordance withMIL-E-5400 prior to ordering or fabricating parts for the production quantity. Theparts shall conform to MIL-E-5400. Nonstandard parta shall be approved by thecontracting activity prior to the fabrication of the completed item. Wheneverpracticable, nonstandard e
25、lectronic parts shall not constitute more than 30 percent .of the total quantity of electronic parts used in the construction of the indicator.3.4 Materials3.4.1 Nonmagnetic materials. Nonmagnetic materials shall be used for all parts ofthe indicator, except where magnetic materiala are essential.3.
26、4.2 Nonferrous materiala. Nonferrous materials shall be used for all parts of theindicator, except where ferrous materials are essential.3.4.3 Metals. Metals shall be of the corrosionresistant type or treated to resistcorrosion due to fuels, salt fog, or atmospheric conditions likely to be met insto
27、rage or normal service. a713.4.3.1 Dissimilar metals. Unleaa protected against electrolytic corrosion,diaaimilar metals shall not be used in intimate contact with each other. Dissimilarmetals are defined in MIL-STD-889.3.4.4 Toxic and Corrosive fumes. The indicator shall be of such material andconst
28、ruction that when the material la burned, fumes or gaaes that combine wfth theatmosphere to form acid or corrosive alkali will not be liberated.3.4.5 Protective treatment. Nhen materials are used in the construction of theindicator that are subject to deterioration when exposed to climatic andenviro
29、nmental conditions likely to occur during service usage, they shall beprotected against such deterioration in a manner that will in no way preventcompliance with the requirements of this specification. The uae of any protectivecoating that will crack, chip, or scale with age or extremes of climatic
30、andenvironmental conditions shall be avoided.3.4.6 Recycled and reclaimed materials. Recycled and reclaimed materials shall beencouraged to the msximum extent poaaible without jeopardizing the intended end useof the item.3.5 Design and construction. Unless otherwise specified, the requirements areap
31、plicable to all types of indicators covered by this specification.3.5.1 Function. The indicator shall operate f rcim a second harmonic input thatshall be received from its respective transmitter. The EFU-26/A aerlea indicators a71shall include a constant frequency pnwer supply to drive the respectiv
32、e transmitter.4Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-I-83026DThe EFU-26/A series indicators are repeater types only for use in dual placeaircraft or when another fuel flow display is required.3.5.1.1 Second harmonic input. The EFU-26/A-
33、7, jA-8, and/A-13 and the EFU-43/A-7,/A-8, and /A-13 indicators shall include all of the circuitry and mechanismnecessary to convert a second harmonic signal from a TRU-98JA transmitter conformingto MIL-T-83027 to a pointer indication of fuel flow rate in pounds-per-hour ofaviation fuel. The indicat
34、or shall be designed to operate on the second harmonicsystem principle in which the moving element consists of nonenergized Permanent2-pOle msgnets. The toroidally wound stator is energized with 115V 400-Hzsingle-phase a-c power. Remote indicaton of the angular position of the turbine inthe TRU-98/A
35、 transmitter is obtained through the use of the coil and core operatingon the permanent magnet rotor ( turbine). Tbe direct-current resistent of thepickoff coil sections shall betemperature is 250 15 “C.3.5.2 Input signals3.5.2.1 Transmitter rotation.turbine will rotate 307” for abetween 290 and 350
36、 ohms perThe TRU-98/A transmitter issection when the coilcalibrated so that thefull-scale reading. For an increasing flow rate, theturbine shall rotate in a clockwise direction when viewed from the inlet end.3.5.2.2 Power. The indicators shall be designed to operate from 115V 10 percent400 Hz 10 per
37、cent single-phase power as specified in MIL-STD-704 for equipmenthaving Category B characteristics. In addition, the EFU-26/A-13 and EFU-43/A-13indicators shall operate from power having a frequency variation as great as 20percent except that the ratio of frequency to voltage shall deviate from norm
38、al(400/115) by more than :22 percent.3.5.2.2.1 Power consumption. Indicator power consumption (including the powerSUDDIY) shall not exceed 50 va for the EFU-26/A series indicators with the. . .transmitter load connected but excluding the lightingseries indicators.circuit and 15 va for EFU-43/A3.5.3
39、Output signals3.5.3.1 Power supply. The EFU-26/A series indicators shall supply either 34 4V rms8-HZ 0.05 percent 2-phase power or 65 to 126v 400 Hz single-phase a-c power, butnot both, to the TRU-98/A transmitter conforming to MIL-I-83027. The power supplyshall meet the applicable tolerances of tab
40、le I. The output of the power supplyaball be either untuned or broadly tuned and shall operate one transmitter.3.5.3.2 Power supply warmup. After a warmup period of not more than 1 minute, thepower supply shall meet the tolerances specified in table I over an operating rangeof -54” to 71”C.3.5.4 Cas
41、e. The case shall conform to MS33639 for tbe 2-inch size, shall befinisbed in durable dull black, and shall be hermetically sealed. The seal shall beso designed and constructed that it will not be dependent upon materials that mightbe affected by the action of any atmospheric conditions to which the
42、 case may besubjected. The front edge of the case shall not extend beyond the outer surface ofthe cover glass by more than 0.031 inch. The case length, dimenston L, shall notexceed 7.312 inches for the EFU-26/A series indicators and 3.5 inches for theEFU-43/A series indicators, exclusive of the elec
43、trical receptacle. The design ofthe case shall be such that the internal mechanism may be removed from the case,replaced, and the case resealed without the use of special tools unless they are5Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-I-830
44、26BTABLE 1. Indicator tolerances.PPH TOLERANCESO-15,000 Range0-15,000 EFU-26fA-13andTEST RangeEFu-43/A-13Low High Low High0-6,000 Above 6,000 0-4,000 Abcwe 4,000Position error 30 85 20 100 -Hysteresis 30 85 20 100Vibrationpointer oscillation(Double amplitude) 45 125 30 150Pointer variation 30 85 20
45、100Friction errorRoom and hightemperature 30 85 20 100Low tempera tUre 45 125 30 150Voltage and frequencyvariation 40 110 27 125TOLERANCE (PERcENT OF RATED FREQuENCY)Power supply 8-1-lertzpower 400-Hertz powerRoom temperature :0.05 *O .25Voltage Figure 1. EFu-26/A and 43/A fuel flow indicatOrscale a
46、nd pointer presentations.9Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-I-83026Dnormal operating period of such parta shall be reported by the contractor to thecontracting activity.3.5.17 nthettc jewel bearings. When sapphire or ruby synthetic
47、jewel bearingsused, they shall be in accordance with MIL-B-27497.3.5.18 Screw threads. Unless otherwise specified , the threada of all machineaci-ews shall conform to MIL-S-7742.3.5.19 Range. The indicator presentations shall be split range as shown onfigure 1. The scales shall be linearly graduated
48、 in the contracted and expandedranges within 15 minutes of arc between adj scent scale graduations.are a713.5.20 System Safety. The indicator shall be so designed that tbe design will notresult in a Category III or Category IV hazard as defined in MIL-STD-882, paragraphentitled Hazard Level, for the
49、 predicated operating life apecif ied in 3.5.16.3.6 Performance. The indicators shall be capable of meeting the requirementsspecified herein under tbe following conditions:a. Temperatures - operating temperatures ranging from -54” to 71 “C andstorage temperatures ranging from -62” to 71 “C.b. Vibration - vibration from 5 to 500 Hz atto 0.250 inch for 9 hours.c. Thermal shock - eight cycles of alternateand 5 for 30 minutes.double amplitud
