1、31 July 1978 MILITARY SPECIFICATION INDICATOR SET, VERTICAL SCALE This specification is approved for use by the Naval Air Systems Command, Department of the Navy. 1. SCOPE 1.1 Scope. The equipment covered by this specification is a tape type vertical scale indicator set for engine performance indica
2、tion. 1.2 Classification. The indicator set covered by this specification shall consist of one each of the following dual indicators: Type Designation Indicator EHU-41/A ERU- 2 O /A EFU-45/A Indicator, Exhaust Gas Temperature (EGT) Indicator, Electrical Tachometer (RPM) Indicator, Rate of Fuel Flow
3、(FF) 1.3 Associated Equipment. The indicator set shall operate from inputs from the associated equipment listed in 3.3.19. 2. APPLICABLE DOCUMENTS 2.1 General. The following documents of the issue in effect on the date of invitation of bids or request for proposal form a part of this specification t
4、o the extent specified herein. SPECIFICATIONS Military MIL-P-116 Preservation, Methods of MIL-D-1000 Drawings, Engineering and Associated Lists MIL-B-5087 Bnding, Elect-rical and Lighting Protection, for Aerospace Systems MIL-W-5088 Wiring, Aircraft, Selection and Installation of r COMMENTS OR RECOM
5、MENDATIONS WHICH MAY BE OF USE IN IMPROVING THIS DOCUMENT MAY BE SENT TO THE PREPARING ACTIVITY WHEN A SELF-ADDRESSED STANDARDIZATION. DOCUMENT IMPROVEMENT PROPOSAL (DD FORM 1426) APPEARS AT THE END OF THIS DOCUMENT, OR BY LETTER ADDRESSED TO THE COGNIZANT ACTIVITY. 7 Provided by IHSNot for ResaleNo
6、 reproduction or networking permitted without license from IHS-,-,-MIL-E-5400 MIL-W-5846 MIL-I- 70 71 MIL-C-14806 MIL-T-18303 MIL-N-18307 MIL-T-22030 MIL-L-25467 MIL-G-26611 MIL-B-2 749 7 MIL-S-38130 Electronic Equipment, AirboGe, General Specification for Wire, Electrical, Chrome1 and Alumel, Therm
7、ocouple Indicator, Temperature, Thermocouple, Hermetically Sealed, General Specification for Coating, Reflection Reducing, for Instrument Cover Glasses and Lighting Wedges Test Procedures; Preproduction, Acceptance, and Life for Aircraft Electronic Equipment; Format for Nomenclature and Identificati
8、on for Electronic, Aeronautical, and Aeronautical Support Equipment, Including Ground Support Equipment Transmit-er, Rate of Flow, Fuel, TRU-26/A (300 to 10,000 PPH) Lighting, Integral, Aireraft Instrument, General Specification for Generator, Tachometer, GEU-7/A, Miniature Bearings, Jewel, Sapphire
9、 or Ruby, Syqthetic System Safety Engineering of Systems and Associated Subsystems and Equipment; General Requirements for Glass, Aircraft Instrument, Lighting Wedge, and Cover MIL-G-81704 Naval Air Systems Command AR-5 Microelectronic Devices Used in Avionics Equipment, Procedures for Selection and
10、 Approval of Maintainability of Avionics Equipment and Systems, General Requirement for Failure Classification of Reliability Testing, General Requirement for AR-10 AR-34 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-1-85112 (AS) STANDARD S Fed
11、eral Federal Standard Number 595 Colors Military MIL-STD-109 Quality Assurance Terms and Definitions MIL-STD-143 Standards and Specification, Order and Precedence for the Selection of MIL-STD-454 Standard General Requirements for Electronic Equipment MIL-STD-461 Electromagnetic Interference Characte
12、ristic, Requirements for-Equipment MIL-STD-462 Electromagnetic Interference Characteristics, Measurement of MIL-STD-704 Electronic Power, Aircraft, Characteristics and Utilization of MIL-STD-781 Reliability Tests; Expotential Distribution MIL-STD-785 Requirements for Reliability Program MIL-STD-794
13、Parts and Equipment, Procedures for Packing and Packaging of MIL-STD-810 Environmental Test Methods MIL-STD-889 Dissimilar Metals MS 3 35 5 8 Numerals and Letters, Aircraft Instrument Dial, Standard Form for 2.1.1 Availability of Documents. When requesting specifications, standards, drawings, and pu
14、blications, refer to both title and number. Copies of specifications, standards, and drawings required by suppliers in conjunction with specific procurement functions may be obtained upon application to the Commanding Officer, Publications and Forms Center, Code 105, 5801 Tabor Avenue, Philadelphia,
15、 Pennsylvania 19120. 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-1-85112 (AS) 3. REQUIRFNENTS 3.1 First Article Testing, This specification makes provision for first article testing (4.3). 3.2 Parts, Materials, and Processes. In the selecti
16、on of parts, materials, and processes, the fulfillment of major design objectives shall be of prime consideration. to the requirements of MIL-E-5400, the specifications and standards listed in MIL-STD-143, and the requirements listed herein. not be used. in a military standard, such parts and materi
17、als shall be used which are of the bestcommercial quality, of the lightest practicable weight, entirely suited for the purpose and readily available. However, only nonflammable materials shall be used, Commercial utility parts such as screws, bolts, nuts, and cotter pins having suitable properties m
18、ay be used provided: Parts, materials, and processes shall conform Electron tubes shall When suitable parts and materials have not been established a. Such parts can be replaced by the military standard parts without alteration. b. The corresponding standard part numbers are referenced in the parts
19、list and, if practicable, on the contractors drawings, (Military standard parts shall be identified on the drawings by their part numbers.) 3.2.1 Nonstandard Parts and Materials Approval. Approval for the use of nonstandard parts and materials of commercial quality (see 3.2), including transistors a
20、nd diodes other than microelectronic devices, shall be obtained as outlined in MIL-E-5400. 3.2.2 Microelectronic Devices and Modular Assemblies Microelectronic devices shall be selected and approved in accordance with AR-5. microelectronic modular assemblies shall be described by a contractor speci-
21、 fication and must be approved by the procuring activity. encapsulants, embedments, or potting materials used with modular assemblies containing integrated circuits and discrete parts shall without damage to the assembly. When used, Conformal coatings, be easily removable 3.2.3 Part Testing. evidenc
22、e of the part having been tested. The test results may be available from a data exchange program, from previous contracts, or if not so avail- able, the parts must be tested under this requirement. Unless required by the contract, the submission of the test information on parts is not required, but
23、the manufacturer shall be able to produce test results when requested by No part shall be used in the equipment without 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-in manufacturers part numbers shall be governed by the drawing number requiremen
24、ts of MIL-D-1000. advantage is obtained; in which case, each application shall be subject to the approval of the procuring activity. Quantitative substantiating data shall be submitted with the application. 3.2.7 Metals. Metals shall be of the corrosion-resistant type or suitably protected to resist
25、 corrosion durine; normal service life. shall not be used in intimate contact with each other unless suitably protected against electrolytic corrosion by means of protective coating or sealant. growth shall be used to the greatest extent practicable. fungal nutrient material must be used, such mater
26、ial shall be treated with a suitable fungicidal agent or be protected by hermetic sealing. In cases where 3.2.10 Corrosive Fumes. The components used in the construction of the indicator set shall be selected such that no volatiles of potentially toxic or corrosive nature will be liberated during th
27、e tests specified in 4.7 or due to failure of a component. 3.2.11 Filling: Medium - The filling medium shall be a mixture of 90 + 2 percent nitrogen and the remainder helium. The filling medium shall be at least 98 percent pure, be free of dust particles, and contain not more than 0.006 milligram of
28、 water vapor per liter (dewpoint -65“ Celsius (C) at the filling pressure. The absolute pressure of the filling medium in the hermetically sealed enclosure shall be approximately 1 atmosphere. struction of the indicator set which are subject to corrosion in salt air or other atmospheric conditions l
29、ikly to be encountered during service usage shall be protected against cofrosion in a manner that will in no way prevent compliance with the performance requirements of this specification. The use of any protective coating that will crack, chip, or scale with age or extremes of atmospheric condition
30、s shall not be used. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-3.2.13 Jewel Bearings. When jewel bearings are used, they shall be in accordance with MIL-B-27497. 3,3 Design, Construction, and Workmanship. 3.3.1 General. The equipment shall cont
31、ain all of the instrumentation required to process and display the signal data received from the engine mounted sensors. indicators shall be accomplished by the manufacturer in accordance with MIL-E-5400 for class 2 equipment, subject to the requirements of this speci- fication. The requirements of
32、this specification are detailed only to the extent considered necessary to obtain the essential mechanical and electrical characteristics, performance, and reliability of the indicator set. The design, layout, and assembly of the indicators and their component parts shall be such as to facilitate qu
33、antity production, failure analysis and repair, and to result in minimum power consumption and weight. The detailed mechanical and electrical design of the set 3.3.2 Modularization. The electronic portions of the equipment shall be functionally modularized in accordance with AR-10 and as outlined in
34、 MIL- E-5400. 3.3.2.1 Modification. When a manufacturer has previously produced equipment to this specification, the design shall not be changed without the written approval of the procuring activity. 3.3.3 Indicator Case. The indicator case shall be as. specified in the detail requirements and desi
35、gned to permit mounting in a mounting rack assembly in accordance with Figure 8. The cases shall be hermetically sealed and shall have a smooth external surface. that the internal mechanisms may be removed, replaced, and the cases resealed without the use of special tools and fixtures, If tear strip
36、s are provided for this purpose they shall not have end pieces protruding outside the case dimensions. Filling tubes, if used, shall not be left exposed to possible damage from impact or handling. Hermetic sealing shall be so accomplished that the seal will not be dependent upon materials that will
37、be affected by the action of any atmosphere.to which the indicator may be subjected. Elastromeric or resinous materials may be used for cover glass seals provided the specified leak rate requirements are met under all tests and environ- mental conditions specified herein. durable dull black conformi
38、ng to Federal Standard Number 595 (FED-STD-595), color number 37038. The cases shall be so designed The cases shall be finished in a 3.3.4 Indicator Mechanisms. The indicator mechanisms shall be suffi- ciently rugged that small distortions of the case will not affect their accuracy of operation. Pro
39、vided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-1-85112 (AS) 3.3.5 Total Weight. The total weight of an indicator set, including mounting rack, but excluding interconnection cabling, shall be a minimum consistant with good design and shall not excee
40、d 9.0 pounds. 3.3.6 Integral Lighting. Integral lighting of the indicators shall be in accordance with MIL-L-25467. 3.3.6.1 Lamp Location. The lighting system shall be SO designed that when lamp replacement is necessary the lamps may be accurately and securely positioned. No provision shall be made
41、for lamp replacement in the field, but the lamps shall be so installed that easy replacement be accomplish required shall not a. Alternating current (ac) power (single phase) 26v, 400 Hz, Category By 42 volt-amperes (va). b. Ac power (Lighting) 5v, 400 Hz, 9.0 va. The power factor of the ac power ci
42、rcuits shall be within 0.85 lagging to 0.95 leading. 3.3.22.1 Overload Protection. Overload protection for the equipment shall.be provided integrally. All parts and circuits of the equipment which are likely to carry an overload due to failures or poor adjustment shall be proportioned to withstand a
43、n overload without permanent damage to the equip- nient or shall have suitable protective devices.- The use of fuses is for- bidden, and other protective devices shall be held-to a minimum. 3.3.22.2 Undervoltage Protection. The equipment shall not be damaged by voltages below the minimum specified h
44、erein and shall automatically resume normal operation when the voltage returns within limits. 3.3.23 Workmanship. The indicators, including all parts and assemblies shall be constructed and finished in a thoroughly workmanlike manner and shall conform to the requirements of MIL-STD-454. 3.4 Detail R
45、equirements. 3.4.1 Exhaust Gas Temperature (EGT) Indicator. The EGT indicator shall conform to the following detail requirements. 3.4.1.1 Function. The EGT indicator shall include all of the circuitry necessary to convert signals from Type K (Chromel-Alumel) theromcouples located in the exhaust gase
46、s of the left and right turbojet engines to a dual temper- ature indication in degrees Celsius (C). 3.4.1.2 Form Factor. 3.4.1.3 Weight. The weight of the EGT idicator shall not exceed 2.7 The EGT indicator shall conform to Figure 1. pounds 3.4.1.4 Display. The display shall conform to Figure 5. 10
47、Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-flIL-I-85LL2 66 9979706 OLY5037 7 MIL-1-85112 (AS) 3.4.1.5 Electrical Connectors. The electrical connectors shall be the types specified below, shall be wired to provide specified operation when connect
48、ed to power and signal inputs as shown on Figure 4, and shall be hermetically sealed. Pins A and C of the Cannon connector shall be made of alumel and pins B and D of chromel. Reference Designation Receptacle Type Function J1 Amphenol 67-04H14-92(105) Power Inputs 52 Cannon GS02-14S-2P-003(F9)(F109)
49、 Type K Thermocouple Inputs 3.4.1.6 Thermocouple Cold Junction Compensation. The indicator shall incorporate temperature compensation for the thermocouple cold junction within the indicator. used. temperature changes at the cold junction. shall be either 24OC or OC. on the nameplate. Temperature control at the cold junction shall not be The compensation shall be such that the circuit is independent of the Cold junction reference temperat
