1、MIL-I-8580B 66 = 9999906 0126899 T -MI L-l-8580B 2 April 1965 SUPERSEDING 24 October 1955 MIL-I-?oA( Aso) MILITARY SPECIFICATION INDICATOR, TACHOMETER, mLICOpTER, 0-4000 RPM, TYPE MA-1 # This specification is mandatory for use by all Departments and Agencies of the Department of Defense. 1. SCOPE 1.
2、1 Scope - This specification covers design and all perform- ance requirements for procurement of a helicopter tachometer indicator. 1.2 Classification - The tachometer indicator shall be of one type having a dual pointer, ratio 1 to 1, to indicate engine rpm and apparent rotor rpm. # 2. APPLICABLE E
3、OCUMENTS 2.1 The following documents of the date of invitation for bids or request for proposal, form a part of this specification to the extent specified herein. SPECIFICAT IONS Federal BB-N-411 Ni trogen DD-G-451 Glass, Flat and Corrugated, for Glszing, Mirrors, and other uses QQ-C- 320 Chromium P
4、lating (Electrodeposited) a-N-290 Nickel Plating (Electrodeposited) N-P- 416 Plating, Cadmium (Electrodeposited) QQ-Z-325 Zinc Coating, Electrodeposited, Requirements for Mil i tary MIL-P- Preservation, Methods of Provided by IHSNot for ResaleNo reproduction or networking permitted without license f
5、rom IHS-,-,-MIL-I-5OB bb W 999990b 0126900 2 Military (Continued) MIL-M- 3171 MILE- 5272 MIL-E- 5400 MIL-G- 5413 MIL-C-5541 MIL- s-6872 MIL-S-7742 -7936 MIL-A-8625 MIL-R-22256 MIL- R- 23094 MIL-P- 23408 MIL-D-70327 Magnesium Alloy, Process for Corrosion Protection of Environmental Testing, Aeronauti
6、cal and Associated Equipment, General Specification for Electronic Equipment, Aircraft, General Specification for Generator, Tachometer, Four Pole Chemical Films for Aluminum and Aluminum Alloys Soldering Process, General Specif i- cation for Screw Threads, Standard, Optimum Selected Series, General
7、 Specif i- cation for Parts and Equipment, Aeronautical, Preparation for Delivery Anodic Coatings, for Aluminum and Aluminum Aloys Reliability Requirements for Design of Electronic Equipment or Systems Reliability Assurance for Production Acceptance of Avionic Equipment, General Specification for Pl
8、ating: Tin-Cadmium (Electrode- posited) Drawings, Engineering and Associated Lists 2 Federal FED- SIID- 595 Colors Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- MIL-I-580B 66 7779706 0326903 4 a Militaq MIL-STD-lW MIL-STD-143 m33558 MC33585 m33586
9、 m33639 Ms33678 MILI-8580 Identification Marking of U. S. Military Property Specifications and Standards, Order of Precedence for the Seaection of Numerals and Letters, Aircraft Instrument Dial, Standard Form of Pointers, Dial, Standard Design of Aircraft Instrument Metals, Definition of Dissimilar
10、Cases, Instrument, Clamp-hbunted, Aircraft Connec tor, Receptacle , Electric , Integral EZounting (Copies of specifications, standards, drawings and publi- cations required by suppliers in connection with specific procurement functions should be obtained from the procuring activity or as directed th
11、e contracting officer. ) 3.1 Preproduction - The indicators furnished under this specification shall be a product, which has been tested and meets the Qaaity Assurance Provisions specified herein. 3.2 Selection of Government documents - Ekcept as provided in 3.2.1 and .3.2.2, specifications and stan
12、dards for necessary commodities and services not specified herein shall be selected in accordance with KIE sin-143: 3.2.1 Commercial parts - Commercial parts having suitable properties shall be used, when on the date of invitations for bids, there are no suitable standard parts. screws, bolts, nuts,
13、 cotter pins, having suitable properties, may be used In any case, commercial parts, such as provided: (a) They can be replaced by the standard parts (MS er AN) without alteration. The correaponding standard part numbers are referenced in the parts list and if practicable, (b) . on the contractors d
14、rawings. 3.2.2 Standard parts - With the exception of 3.2.1, MS and AN standard pnrts ehal be used where they suit the purpose. identified on the drawings by their part nuabers. They shall be 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-1-85
15、B bb 9999906 0326902 b W MIL- 1-8580B 3.3 Materials - Materials shall conform to applicable specifications and shall be as specified herein. Materials for which there are no applicable specifications, or which are not specifically described herein, shall be of the best quality, of the lightest pract
16、i- cable weight, and suitable for the purpose intended. 3-39 1 Critical materials - Noncritical materials shall be used where practicable. to meet specification requirements, the material used shall be the least critical of those which are adequate for the purpose. Where the use of a critical materi
17、al is essential 303.2 used for all parts of the indicator except where magnetic materials are essential. Nonmagnetic materials - Nonmagnetic materials shall be 3.39 3 Metals - Metals shall be of the corrosion resistant type, or shall be suitably protected as specified herein to resist corro- sion du
18、e to fuels, salt spray, or atmospheric conditions to which the indicator may be subjected when in storage or during normal service life. 3.3.3.1 Dissimilar metals - Dissimilar metals as defined in MS33586 shall not be used in intimate contact with each other, unless protection against electrolytic c
19、orrosion is provided. 3.3.3.2 Magnesium alloy parts - Magnesium alloy parts shall be treated in accordance with MIL-M-3171. an anodic treatment approved by the procuring activity shall be used. but ehall accompany, activity. 4.4.3.1 Frocedures - me following procedures shall be adhered to for the re
20、spective teats: (a) Predeivery teats. 1. ?allm of sanaple in a way repairable. - The .ample may be repsired, or replaced, and the tests continued. The choice is the contmctorsb 2. Igilure of a sample in a way not repsirable. - !$he remple murt be replaced if three only were used initially. ia Provid
21、ed by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-i4 3. 4. 5 6. 7. 8. Hew Items placed on test may have design corrections Incorporated. This should be noted in the log. To be counted toward the MTBF determination, 8 total of 3 times the M!BF (as a minimum)
22、must be run on all ttems. Wo samples must demonstrate MF 8t.least equal to the required MTBF. without failure. ) (Hot necessarily in computing the MTBF, equipments, their equi$ment running tium, and fallres my be omitted (censored) provided at least three consecutive equipments of the latest entry a
23、re used and all design chanws Incorporated thereln are in the production eguipments. All failures shall be analyzed and corrections made in production when appropriate. A log shall be maintained in which pertinent Information must be entered. This log shall be available to the procuring activity. (b
24、) Delivery tests. 1. Failures murt be analyzed and production corrections incorporated as applicable. 2. Test results must satisfactorily meet the requirements of the following table : hilures Total in Multiples of Specified MTBF 4.4 5.2 6. o 6.8 7.6 8.5 9.3 3. Ail samples must count toward the fina
25、l MTBF determination unless otherwise agreed to by the procuring activity. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- MIL-1-85808 bb E 99999Ub 0126913 O = I m-1-8580 4. rpm. 4.6.4 Position error - The indicator shall be held in the normal opera
26、ting position, vibrated in accordance with paragraph 4.5.2, and a reading taken when the generator shaft speed is 1000 rpm. This procedure shall be repeated at 45“ increments as the indicator is rotated through 360“ about each horizontal axis. latter readings from the original reading shall not exce
27、ed 20 rpm. # The maximum deviation of the 16 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-I-8580B bb U 7779706 0126915 4 Ac 4.6.5 Immersion (leakage) - The indicator shall be subjected to and meet the requirements of procedure I of MIL-E-5272.
28、 TABU I Tolerances Generator Drive shaft speed *- .Corre t Indicated Speed r.p Engine and Rotor Movements Tolerances, #pd born Temp. 25 25 25 25 25 25 25 25 25 25 25 25 25 25 30 30 30 30 30 -54c 40 45 50 50 55 60 60 65 70 70 80 85 -35C 40 40 40 40 45 45 50 50 50 50 50 55 OC 30 30 30 30 35 35 40 40 5
29、0 50 50 50 +Ti “C 40 40 45 45 50 55 55 60 65 65 75 80 * Test points at ambients other than room temperature i. 6.6 Insulation - The stator insulation shall be tested by connecting a test voltage of 2ooV at a comercial frequency for a minimum period of 5 seconds between any of the connector pins and
30、any metal parts of the case or electrical connector shell. There shall be no breakdown of insulation as a result of this test. 4.6.7 in a chamber, the temperature of which is controllable. The temperature of the circulating air shall be reduced to -54“ +2“C, and held at this temperature for the dura
31、tion of the test. The indicator shall be kept in the chamber-for approximately 2 hours after the temperature -54“ +2“C . is reached, before the test is started No voltage shall be applied to the indicator terminals during this period. Generator speed shall be slowly increased until both rotor and en
32、gine movements synchronize. Each movement shall synchronize before xx) rpm generator drive shaft speed. Low-temperature starting - The indicator shall be placed # .i _- a d . Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-I-8580B 4.6.8 Scale err
33、or at -!apeeas .Cri 500- and L!H%l rpi. before and after the overspeed and reverse operation test of 4.6.18 shall not be greater than 25 rpm. The fffcruace-dm readiags 4.6. ig %durance - The scale errors of the indicator shdL1 be detemincd when the Lndicator is operated at gsnerator spcds of 1,000 r
34、nd 1500 rpn. rb.ll be t8ken before the Indicator bas attained an appreciable temperature rise. rpl for e period of 1,OOO hours. after the indicator has been allowed to cool to room temperature, the scale errore of the indicator shall again be detemincd when the indicator is opratmd at generator spee
35、ds of1000 and 1500 pm. obtalnod before and after this test shal not exceed 30 rpm. other prrts shall become loose or damcrged as a result of this test. Be indicator shall be et room t-emptkratura, and the reading !he indicator shall then bo operated at an indication of 2,600 I200 At the end of the 1
36、,000-hour period and The difference of readings Ho scrcws or 4.6.20 Ihel.Pisl shock - The indicstor shall be subjected to b cycles of exposure to -ter at 85“ *2“C and 0 to 7C without evidence of moisture penetration or dw$e to costing or encloaure. Each cycle of the test shall consist of completely
37、iiimcreing the idicator in water at 85 12.C for a period of 30 alnutes, and than wlthin 5 seaonds of removal from the bath the indicator shdl b immersed for a priod of 30 minutes in the other bath maintained at OC to 7C. 1 cycle following the other until 4 cycles have beea completed. Following this
38、test, the indicator shlll be subjected to the riiwru2rn (-e)- Pncfpitation tests of 4.6.5 and 4.,i?,respectively. or pzwcipitation shall occur as a reI5dt of these tests. mis cycle shall be rtpC8-d contlnuouely, Bo indicator leekage 4.6. a Edt spray - uie Indicator shall be subjected to a sait spray
39、 ia accordance-with Procedure I, MJL-E-55rfZ. nectioine shall be made to tho indicator in such manner as to simulate in- stalIed conditions. Following this, the indicator shall be errmlned, end there shall be no ovidence of external corrosion or deterioration which will affect subsequrnt opration. I
40、hc indicator shall then be subjected to the -iU (le-) and Insulation tests of 4.6.5 and 4.6.6, respactivey, as specified herein. water and air-dried prior to conduction of the InsuLation test of 4.6.6. Exte.rnal Con- !be external surface of the indicator #y be washed wlth distilled 4.6.22 met for he
41、lium - aia indicator case shall be punctured, or the fillkg tube out, and the indicator subjected to the test for helium by mana of a maas spectroaater type helium detector. helium shall be cause for rejection. FailUr to etect 4.6.23 Intenul examination - !be case of the indicator shall be apmd and
42、the internal awchaniem examirad. to the rschanism that msulted.from any of the abow tests, or any other and the indicator shall have been subjected to and met all the requirements of a new indicator. . 6.5 Preproduction test provisions - The manufacture of indicators on contract shall not commence u
43、ntil the samples submitted are pronounced satisfactory by the procuring activity. in continuous production of the indicators from contract to contract, the submission of further prepmeduction samples on the subsequent contracts may be waived at the discretion of the procuring activity. Approval of p
44、reproduction samples or the waiving of preproduction tests does not reduce the requirements for acceptance testing. When a contractor is 6.5.1 It shall be understood that the indicator supplied under contract or order shall be identical to the corresponding preproduction sample in design, constructi
45、on, quality, material, workmanship, and method of manufacture. shall be made only by the procuring activity. change shall oonstitute cause for rejection. Deviation from the standards of the preproduction sample hridence of unauthorized 6.6 The outside margins of this specification have been marked “
46、#, to indicate where changes from the previous issue have been made. no liability whatsoever for any inaccuracies in these notations. and contractors are cautioned to evaluate the requirements of this document based on the entire contract as written irrespective of the marginal nota- tions and relat
47、ionship to the last previous issue. This has been done as a convenience only and the Government assumes Bidders 22 _- _- -o Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-I-85B 66 m 7797706 L2b72L T m - MIL- I-8580 Custodians Anay-m Navy - WP Ai
48、r Force - No interest Preparing activity: Navy -WP (Project NO, 6623-0078) Review interest: Araiy-m Air Force - No interest Navy - WP NOTICE - Review/user information is current as of date of +h+= document. For future coordination of changes to this document, draft circulation should be based on information in the current Federal Supply Classification Listing of DOD Standardization Documents. 23 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
