1、J MIL-C-95953 (3) LO W 7Oh 0309568 4 WS i1 June 1976 SUPERSEDI% G AbfBmT 2 18 December 1975 MILITARY SPECIFICATCON CONTROL PANEL, PILOT This amendment forms a part of Military Specification MIL-(2-45953 (WC ) dated 22 January 1974. Page 1 Paragraph 2.1 - Under “SPECIFICATIONS“, add the following spe
2、cification: “MIL-A-45967 - hament Subsystem, Helicopter: Under “STANDARDS“, add the following standard : M28A1. It - “MIL-Sm-781 - Reliability tests : Exponential Distribution.“ Page 4 Add the following paragraphs: shall have a minimum acceptable Mean-Mission-Between-Failures (MMBF) of not less than
3、 1.085 missions with a desired and specified MMBF of 1627 missions. A mission is defined as tnose functions of the pilot control panel necessary to simulate the expenditure of 4000 rounds of 7.6% ammuni.tion and 283 rounds of 4Q-m munition during a tw hour flight, A faiiure $511 be defined as a non-
4、occurrence of the appropriate event when parer is applied to the control panel and the required switches are actuated. “3.6 Reliability. When specified (see 6.2), the pilot control panel Testing shall be as specified in 4.4. 3.6.1 Reliability criteria. The above reliability requirements are based on
5、 a minimum acceptable Mean-Time-Between-Failure (MTBF) of 2170 hours. THIS DOCUMENT CONTAINS a PAGES. FSC 10gO Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-2- _- MIL-C-Y5953. (3) 10 W 7797706 0307567 b mi rnL-C-459.53(JC) Amendrnent 3 3.7 Environm
6、enta conditions. Wiien specified (see .), tile pilot control panel shall be capable of satisfying the environmental conditions in accordawe witii MIL-A-45967. W. .en subjected to ti:e environmental conditions, th pibot control panel s;-.all not exnibi-t any detrimental damage or deterioration wiiici
7、r would prevent acceptable preformance. Testing sL.all be as specified in 4.4. 3.8 Eectromgnetic interference (EMI) When specified (see 6.2), the pilot control panel shall be capable of satisfying $:;e EMJ require- rnents in accordance with MIL-A-45967. Testing chd be a6 specified in 44.“ 5 Paragrap
8、h 4.4, Line 6 - Delete “and such other inspection as is necessary to determine compliance with the requirements of the contract“, and substitute “and, when specified (see 6.2), the reliability test (see 3.6 and 4.6.21, environmental conditions test (see 3.7 and 4.6.31, electro- magnetic interference
9、 (ENI) test (see 3.8 and 4.6.4), and such other inspection as is necessary to determine compliance with the requirements of the contract .I Paragraph 4.6.1, Delete “IEL i687087“ and substi-bute “IEL 116%7987“. Add the following paragraphs: “4.6.2 Reliability test. When specified (see 6.2), the relia
10、bility test shall be performed by repeating the test cycle defined in 4.6.2.1. For each test cycle, the failure versus test cycle data Shall be cumu- latively plotted. Testing shall be terminated whenever a decision point, 88 defined in Figure 1, has been reached . functions necessary to perform one
11、 mission) shaU be completed by per- forming the test cycie specified in 16.1. ments for the Master Arm Switch (3.3.3.1) and Weapon Select Switch (3.3.3.2) shall be repeated five times during each test cycle. 4.6.2.1 Reliability test cycle. One teat cycle (representing the roced dures to verify requi
12、re- 4.6.2.2 The contractor snall provide replacement parts as required . to complete the test. 4.6.2.3 At the option of the contractor, the test may be interrupted at the end of a cycle and the test restarted at the point a which it was interrupted. Page 2 of 3 f Provided by IHSNot for ResaleNo repr
13、oduction or networking permitted without license from IHS-,-,-IIIIL -c -45953 (wc ) Amendment 3 4.6.2.4 Coriiplete, accurate records shall be kept for each reliability teat, showing each failure sn part replacement, including an indication of when each failure occurre. In addition, complete, accurat
14、e records sliall be kept for all time losses attributable to the panel, including the time for eacn stoppage. 4.6.3 Environmental conditlas test. When specified (see 6.2), tests shall be performed for each environmental condition in accordance with the applicable method and procedure specified in MI
15、L-A-45967. control panel shall be operated during these tests in accordance with the functional test methcd of 4.6.1, be covered to simulate aircraft installation for the humidity, salt, sand and dust tests. The Open areas of the control panel shall 4.6.4 Electromagnetic interference (EMI) test. Wne
16、n specified (see 6.2), the ?3fI test shall be performed in accordance with the EM require- ments specified in KtL-A-45967. during the ENI test in accordance with the functional test method of 4.6.1. Tre control panel shall be operated Paragraph 6.2.1 - Add the following: “i. Reliability, environment
17、al conditions and electromagnetic interference requirements and tests, when required (see 3.6, 3.7, 3.8, 4.4, 4.6.2, 4.6.3 and 4.6.4).“ Page 10 At top of page, delete the following: “28i SUBSYSTEM: PILOT CONTROL PANEL“ At top of page, add a6 last line: 1-781 Test Plan VII“ Custodian: Army - wc Page 3 of 3 Preparing Activity: Army - wc Project No. 1090-AO42 8- . - Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
