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: Ten Lin Mei (tlinmei@dso.org.sg )
Organization:DSO National Laboratories
Date posted: Wed Jan 26 23:54:28 US/Eastern 2000
Subject: FMECA from Card/Module Level
Message:
I wish to reduce the time in performing FMECA and TA for a large system by starting the FMECA from card and module levels (instead of component level). However, if I adopt this method, inaccuracies will come in when estimating the failure mode apportionments. I can estimate the failure mode apportionment by tracing back the component failure modes that cause the particular card/module failure mode. But this may end up consuming equally long or longer time than the component approach. Is there any reference or standard library on typical card/module failure modes and failure mode apportionment rates ? Or is there any recommendation on a good estimation method ? Also, is there any suggestion on how to verify or validate that this card/module level approach has not lost out a lot in the accuracies compared to the component level approach ? By the way, how do people estimate failure mode apportionments in the functional approach of FMECA ? Tracing back the components that are failure causes ? Thank you.

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