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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

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Original Message:

Posted by: ravi
Date posted: Sat Sep 11 2:18:09 US/Eastern 2004
Subject: FTA
Hi, How can we use house events in FTA to model different operational phases of system? Some literature links or a small example will be useful. Thank You.


Subject: FTA
Reply Posted by: John Cloarec ( )
Organization: SYSTRA
Date Posted: Sun Sep 12 21:41:59 US/Eastern 2004
Hello Ravi, usually the FTA shows differences regarding the phases. A FTA for standby phase must differs from running phases. Similarly for startup phase regarding stop phase. So there is no great difficulty to build the FTA. If this is not the case, the best (from my experience) is to slice the lifecycle in separate sub-phases and build a general FTA addressing, via an “OR” gate, the sub-phases. As a result, you will find the top-event probability for each sub-phases and for the total lifetime.

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