SRC Forum - Message Replies
Forum: Reliability & Maintainability Questions and Answers
Topic: Reliability & Maintainability Questions and Answers
Topic Posted by: Reliability & Maintainability Forum
Organization: System Reliability Center
Date Posted: Mon Aug 31 12:47:36 US/Eastern 1998
Posted by: tom c
Date posted: Tue Apr 16 12:28:16 US/Eastern 2002
Subject: Test Failure: Continue Test or Restart Test?
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).
Subject: Test Failure: Continue Test or Restart
Reply Posted by: C. jayaraman
Date Posted: Thu Apr 18 11:26:09 US/Eastern 2002
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.