NAVY MIL-A-28716 (1)-1977 AMPLIFIER AUDIO FREQUENCY AM-3729( ) SR《AM-3729( ) SR音频放大器》.pdf

1、 . - MIL-A-287Ib (I) 58 9999906 OISqLlIb 5 - MIL-A-28716( EC) AMMENDMENT I 28 March 1977 MILITARY SPECIFICATION AMPLIFIER, AUIO FREQUENCY, AM-3729( )/SR This amendment forms a part of Military Specification MIL-A-28716(EC) dated 15 October 1969. PAGE 4 3.2.3: Delete and substitute the following: “3.

2、2.3 All modular assemblies shall be physically and electrically interchangeable, on modular level only, with their counterpart in the Government furnished equipment (see 3.12). potted assemblies provided in the GFE equipment may be replaced by repairable printed circuit boards using standard parts i

3、n accordance with MIL-E-16400. The PAGE 10 Delete and substitute the following: 3.14.17.1: Il3.14.17.1 Quantitative reliability requirement. The equipment shall have a mean-time-between failure (MTBF) of not less than 1,000 hours at the 90 percent lower confidence level. PAGE 16 4.5.1: “4.5.1 Reliab

4、ility test. the Detail Requirements of MIL-STD-781 and the requirements of the fixed time type reliability test of this specification (see 4.5.2). Delete and substitute the following: The contractor shall conduct reliability tests in accordance with 4.5.2: Temperature and vibration shall be in accor

5、dance with Test Level C of MIL-STD-781. 4.5.3: “4.5.3 Reliability production tests. Following satisfactory completion of reliability qualification testing (see 4.5.2); five units shall be randomly selected by the Government quality assurance representative from each successive 1,000 units produced,

6、five units every 60 days, if less than 1,000 units are produced in 60 days, shall be selected. ducted shall be as specified in 4.5.1 and 4.5.2. withheld pending satisfactory completion of the reliability production test, except as stated in 4.5.3.1. Add the following at the end of the paragraph: Acc

7、eptance i of units on order shall be withheld pending satisfaciory completion of the qualification test.“ Delete and substitute the following: The reliability tests to be con- Final acceptance of units on order shall not be Add the following new paragraph: “4.5.3.1 Rejected equipment. In the event o

8、f rejection, acceptance of all remaining.units on No equip- order shall be withheld pending a complete review and analysis of the cause for failure. ment shall be selected more than once for reliability testing. failure is equipment manufacturer design, corrective action shall be performed on all eq

9、uipments delivered under the contract. If the failure is due to equipment manufacturer workmanship, appro- priate corrective action shall be taken on all equipment remaining to be delivered on the contracts. In order to demonstrate effective corrective action, another random sample of five units sha

10、ll be selected and tested as described in 4.5.1 and 4.5.2. This sample is in addition to the quantity L, required in 4.5.3. Acceptance of material can be resumed pending satisfactory completion of the additional testing. The contractor shall forward a complete report of the failure, cause of failure

11、, corrective action and results of the additional test sample, to the contracting officer prior to acceptance of the remaining material on order, In the event that the cause for 4.5.5: Delete entire paragraph. - i Preparing activity: (Project 5820-N686) FSC 5820 NAVY -EC *US. GOVERNMENT PRiklNG OFFICE: 1977-7050 - P Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-