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Forum: Reliability & Maintainability Questions and Answers

Topic: Reliability & Maintainability Questions and Answers

Topic Posted by: Reliability & Maintainability Forum (src_forum@alionscience.com )
Organization: System Reliability Center
Date Posted: Mon Aug 31 12:47:36 US/Eastern 1998

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Original Message:

Posted by: tom c
Date posted: Tue Apr 16 12:28:16 US/Eastern 2002
Subject: Test Failure: Continue Test or Restart Test?
Message:
I am interested in setting up a fixed duration time terminated reliability test in which I will allow zero failures in the test time interval (test time is based on 90% conf limit). The test article happens to be a complex electronic system and I cannot afford to test more than one unit. If I do get a failure during my test interval, is it preferred to: a) replace the failed LRU and continue testing or b) repair the failed LRU and repeat testing in its entirety or c) do something else (must be specific here). Thanks TC


Reply:

Subject: Test Failure: Continue Test or Restart
Reply Posted by: C. jayaraman (cjayaraman@raytheon.com )
Organization: Raytheon
Date Posted: Thu Apr 18 11:26:09 US/Eastern 2002
Message:
If the LRU is expensive (usually is), repair the unit and continue testing. After each repair, include a few cycles for confidence that the repair holds. I assume you will be testing over temp limits of the design. Evaluate the failures for applicability towards final calculation and evalute results using chi-sq formulae in MIL-HDBK-781 or any good stat book.


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