1、. - MIL-I-2257bC bb m 77777Ob 0330796 2 I Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving this document should be addressed to: Naval Air Engineering Center, Engineering Specifications and Standards Department (Code 93), Lakehurst,
2、NJ 08733, by using the self-addressed Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document or by letter. 17 March 1982 SUPERSEDING MIL-I-22596B(AS) 23 December 1975 MILITARY SPECIFICATION INDICATOR, TACHOMETER, ELECTRIC, 0-120 PERCENT RPM, 2-INCH SIZE Th
3、is specification is approved for use by the Naval Air Systems Command, Department of the Navy, and is available for use by all Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 Scope. This specification covers design requirements and all performance requirements for procurement of
4、hermetically sealed, remote indicating, percent RPM tachometer indicators. 1.2 Classification. The tachometer indicators covered by this specification shall be classified as follows: MS21971-1 Unlighted MS2197 1-2 Lighted MS21971-3 Lighted (Glass Coated per MIL-C-14806 forReflection Reduction) 2. AP
5、PLICABLE DOCUMENTS 2.1 Government documents. 2.1.1 Specifications and standards. Unless otherwise specified (see 6.2), the following specifications and standards of the issue listed in that issue of the Department of Defense.Index of-Specifica- tions and.Standards (DoDISS) specified in the solicitat
6、ion, form a part of this specification to the extent specified herein. SPECIFICATIONS Military MIL-D- 1000/ 1 Drawings, Engineering and Associated Data MIL-C-5015 Connectors, Electric, Circular Threaded, AN Type, General Specification for MIL-S- 77 42 Screw Threads, Standard, Optimum Selected Series
7、: General Specification for Licensed by Information Handling ServicesMIL-I-22576C 66 7777706 0330747 4 W _ SPECIFICATIONS (Continued) Military (Continued) MIL-G-9398 MIL-(2-14806 MIL-L-25467 MIL-G-26611 MIL-1-81400 STANDARDS Military .MIL-STD-109 MIL-STD-130 MIL-STD-143 MIL-STD-454 MIL-STD-461 MIL-S
8、TD-462 MIL-STD-781 MIL-STD-8 1 O MS2 1 97 1 MS33558 MS33585 Generator, Tachometer, High Temperature, Two- Pole, Aircraft Coating, Reflection Reducing, for Instrument Cover Glasses and Lighting Wedges Lighting, Integral, Red, Aircraft Instrument, General Specification for Generator, Tachometer, GEU-7
9、/AY Miniature Instruments, Aircraft, General Specification for Quality Assurance Terms and Definitions Identification Marking of U.S. Military Property Specifications and Standards, Order of Precedence for the Selection of Standard General Requirements for Electronic Equipment Electromagnetic Emissi
10、on and Susceptibility Requirements for the Control of Electromagnetic Interference Electromagnetic Interference Characteristics, Measurement of Reliability Tests: Exponential Distribution Environmental Test Methods Indicator, Tachometer, Electric, 0-120 Percent RFM, 2-Inch Size Numerals and Letters,
11、 Aircraft Instrument Dial, Standard Form of Pointers, Dials, Standard Design of Aircraft Instrument (Copies of specifications, standards, handbooks, drawings and publications required by manufacturers in connection with specific acquisition functions should be obtained from the contracting activity
12、or as directed by the contracting officer .) Licensed by Information Handling ServicesMIL-I-2257bC bb m 7706 01307L18 b m MIL-I-22596C (AS) 2.1.2 Order of precedence. In the event of a conflict between the text of this specification and the references cited herein, the test of this specification sha
13、ll take precedence. 3. REQUIREMENTS 3.1 Qualification. Indicators furnished under this specification shall be products which are qualified for listing on the applicable qualified products list at the time set for opening of bids (see 4. and 6. . 3.2 General design requirements. Selection and use of
14、parts and materials and general requirements for design and construction shall be in accordance with the requirements of MIL-1-81400. 3.3 Selection of Government documents. Specifications and standards for necessary commodities and services not specified herein and in MIL-1-81400 shall be selected i
15、n accordance with MIL-STD- 143. 3.4 Weight. The weight of the completely assembled indicator shall not exceed 1 pound. 3.5 Performance. The indicators shall perform satisfactorily when subjected to the tests specified in Section 4. 3.5.1 Reliability. 3.5.1.1 Operational stability. The indicator shal
16、l operate with satisfactory performance, continuously or intermittently for a period of at least 1500 hours without the necessity for readjustment of any controls which are inaccessible to the operator during normal use. 3.5.2 Reliability in Mean Time Between Failure (BITBF). The indicator shall hav
17、e 1500 hours of mean (operating) time between failures when tested and accepted as outlined under the requirements of 4.6.32. 3.6 Wiring. The 3 leads from the indicator windings shall be designated as B, A and C (conforming to 1, 2 and 3). shall be connected to the B, A and C pins of the electrical
18、receptacle in such a manner that the indicator reading is positive when 3-phase power with phase sequence B-A-C is applied. counterclockwise generator shaft rotation (when viewed from the shaft end), for operating one or two indicators, shall conform to the wiring diagram in Figure 1. For clockwise
19、rotation, reverse leads A and B at the generator plug. The leads Electrical connections for The wiring shall be isolated from the case. Licensed by Information Handling ServicesGEN ER ATOR I N D I C ATO R INDIC ATOR MS21371- I 5 MAKE EXTERNAL CONIdECTION TO 1 I -7 V LIGHTING I- J GE NE RATO R IN O i
20、 C ATO R l N D l C ATO R MC21971 - 2,-3 23 FIGURE I. WIRING DIAGRAM I 4 Licensed by Information Handling ServicesMIL-I-22576C 66 7777706 0130750 Li 3.6.1 Electric connector. The electric connector used shall conform to Requirement 10 of MIL-STD-454, MIL-C-5015 and be of type specified on MS21971. 3.
21、7 Visibility of dial. Visibility of the dial shall be in conformance with MIL-1-81400 except that at least 1/3 of each graduation shall be visible within the cone frustum. 3.8 Dial marking. The dial and subdial shall be marked in accordance wiith MIL-1-81400 and as shown in Figure 2. 3.9 Pointers. T
22、he main dial pointer shall conform to MS33555-8. The subd2al pointer shall conform to MS33585-% its length shall be such that the tfp will extend into the scale approximately 1/2 the length of the graduation. with MIL-1-81400. The pointers shall otherwise be in accordance 3.10 Detail requirements. T
23、he indicator shall be designed for operation from the varying-frequency alternating-current output of tachometer generators conforming to MIL-G-9398 or MIL-G-26611. The frequency of the generator output shall be the same as the speed at which the generator shaft is rotating. with increasing and decr
24、easing speeds the pointers shall move smoothly at a rate consistent with the speed change. simple to permit service maintenance, repair or overhaul without requiring special tools and fixtures. The indicator shall be constructed to withstand the normal strains, jars, vibrations and such other condit
25、ions as are incident to shipping, storage, installation and service. The indicator shall indicate O to 120 percent speed of the engine in approximately 270 of main dial pointer travel and shall indicate 100 percent speed of the engine when the generator 2s driven at 4200 RPM. shall make one complete
26、 revolution for each 10 percent change in indication of the main dial pointer. The design shall be such that The design shall be reasonably The subdi.al pointer 3.10.1 Stop. The indicator shall be provided with a stop which, upon reverse operation of the indicator motor, will stop the pointer motion
27、 after traveling through an arc equal or not less than 2 percent nor more than 4 percent RPM. 3.11 Screw threads. Screw threads 0.060 inch or larger in diameter shall be in accordance with MIL-S-7742 and Requirement 12A Of MIL-STD-454. 3.12 Manufacturers part number. Changes in manufacturers 3.13 Ca
28、se. The indicator case shall be hermetically sealed in accordance with MIL-1-81400 and the outline dimensions of the indicator case shall conform to MS21971. numbers shall be governed by the drawing number requirements of MIL-D-1000/1. Licensed by Information Handling ServicesMIL-1-2259 C(AS) i I .7
29、 74 I =-u50 O.O.OF GRADUATIONS-J I .650 DIA. -1 * ?- .420 -0.D. OF GRADUATIONS - 4-. I I I II I I FINISH I WIDTH OF LINE OR I MARKING I LE“ol0 GRADUATION +_ .O05 MAIN DIAL G R A DU AT ION S NUMERALS PERCENT RPM SUB-DIAL CIRCUM. LINE THICKNESS G R A DU AT I O NS NUMERALS I DIAL BACKGROUND .I40 .I40 .
30、O 62 .I25 .O50 .O93 .O 2 5 .O23 .o I I .O16 ,008 .o1 2 .O16 - - I DIMENSIONS IN INCHES. LETTERS AND NUMERALS IN ACCORDANCE WITH MS33558. Figure 2. Dial Markings Licensed by Information Handling ServicesMIL-1-2259bC 66 = 999990b 0330952 MIL-I-22596C (AS) 3.14 Identification of product. 3.14.1 Namepla
31、te. A nameplate shall be securely attached to the exterior of the case and shall be marked in accordance with the requirements of MIL-STD-130 except that the FSN shall be omitted. 3.15 Reflection reduction coating. The MS21971-3 indicator shall be provided with a reflection reduction coated cover gl
32、ass and lighting wedges where applicable in accordance with MIL-C-14806. 3.16 Electromagnetic interference. The indicator shall comply to the requirements of MIL-STD-461, Parts one and two for Class Alb equipment using the procedures of MIL-STD-462. 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility
33、 for inspection. Unless otherwise specified in the contract or purchase order, the contractor is responsible for the performance of all inspection requirements as specified herein. Except as otherwise specified in the contract or purchase order, the contractor may use his own or any other facilities
34、 suitable for the performance of the inspection requirements specified herein, unless disapproved by the Government. perform any of the inspections set forth in the specification where such inspections are deemed necessary to assure supplies and services conform to prescribed requirements. The Gover
35、nment reserves the right to 4.2 Classification of inspections. Items covered by this specification shall be subjected to the following inspections to determine compliance with all applicable requirements. (1) Qualification inspection (2) Quality conformance inspection 4.3 Qualification inspection. T
36、he qualification inspection shall consist of all the tests of 4.6 performed in the order listed and shall include the reliability test for the Reliability Qualification (Demonstration) Phase, and samples submitted for qualification (see 4.3.1) shall be accompanied by the contractors report showing t
37、hat this reliability phase (4.6.32.1) has been satisfactorily met by the other samples. 4.3.1 Qualification inspection samples. Qualification inspection samples shall consist of a minimum of 6 samples. submitted shall have been previously subjected only to the individual inspections. expense to the
38、laboratory designated in the letter of authorization (see 6.4). the Reliabillty Qualification (Demonstration) Phase, which will be run by the contractor at his plant. The samples Three samples shall be forwarded at the contractors At least three samples shall be retained by the contractor for Licens
39、ed by Information Handling ServicesI MIL-I-2257bC bb I 797970b 0130753 T I MIL-I-22596C (AS) 4.3.1.1 Qualification inspection sample identification. The qualification inspection samples shall be plainly identified by durable tags, securely attached, and marked with the following information: Sample
40、for Qualification Inspection Indicator, Tachometer, Electric, 0-120 Percent RPM, Submitted by (Manufacturers name, date and part number) 2-Inch Size for Qualification Inspection in accordance with Specification MIL-I-22596C(AS) under authorization (reference lettek authorizing tests) 4.4 Quality con
41、formance inspection. The contractor shall furnish all samples and shall be responsible for accomplishing all the inspections except sampling plan B inspections, which will be conducted at a Government laboratory designated by the procurhg activity. conformance inspection, except for sampling plan B,
42、 shall be under the supervlsion of the Government quality control representative. The contractor shall furnish test reports showing detailed quantitative results for all tests required by this specification, signed by an authorized representative of the contractor or laboratory as applicable. Accept
43、ance or approval of material during the course of manufacture shall in no case be construed as a guarantee of the acceptance of the finished product. following tests: Quality Quality conformance inspection shall consist of the a. Individual b. Sampling planA c. Sampling plan B d. Reliability assuran
44、ce 4.4.1 Individual inspection. Each indicator submitted for acceptance shall be subjected to the individual inspection. These tests shall determine compliance with the requirements of material, workmanship, operational adequacy and reliability. As a minimum, each instrument accepted shall have pass
45、ed the following tests: Examination of product Lighting (Individual tests and MIL-L-25467) Starting - Room temperature Scale Error - Room temperature Friction error Position error Pointer alignment Dielectric strength Power consumption (Lighted type indicators only) 4.4.2 Sampling plans. The samplin
46、g plans shall consist of sampling plan A and sampling plan B. The inspection samples selected for sampling tests shall first have passed the Individual inspection, The test samples which have been subjected to sampling plan A test shall Licensed by Information Handling ServicesMIL-1-22 59 6C (AS). n
47、ot be delivered on contract until they have been refurbished and resubmitted and passed all the Individual tests. Test samples which have been subjected to the sampling plan B shall not be delivered on contract. Quantity Offered for Acceptance Quantity to be Selected for Sampling Plan A Tests First
48、15 1 (Zero when sampling plan B is invoked) Next 50 1 Next 75 1 Next 100 1 Each additional 1 200 or fraction thereof When a defective indicator is detected, no items from those still on hand or later produced shall be accepted until the extent and cause of failure have been determined and appropriat
49、ely corrected. In addition, when a failure occurs, shift to one sample out- of the next fifteen and proceed 4.4.2.1 for sampling plan A as indicated (one from next 50, etc.). Sampling plan A inspection. shall be subjected to the following tests: Each sample selected Leakage Precipitation or fog Magnetic effect Lighting (MIL-L-25467, sampling plan A, Starting - low temperature Scale error - low temperature Scale error - high temperature Vibration error lighted type indicators only)- 4.4i2.2 Sampling plan B inspection. One indicator shall be selected
