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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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Posted by: Michelle LI ( )
Date posted: Fri Nov 15 8:38:55 US/Eastern 2002
Subject: Functional FMEA
I have a question about functional FMEA. We have a dual avionics system. Driven by safety analysis, we need to perform a functional FMEA only for miscompare function. Miscompare function is not a stand alone function. The circuits, such as microprocessor and memeory, which do miscompare is shared by other functions. I could not find any guidelines about this kind of functional FMEA in ARP4761 or ARP5580 or any FMEA books. I would appreciate if I can get help on this issue. Regards, Michelle Li


Subject: Functional FMEA
Reply Posted by: BWD (bdudley@iitri.o )
Organization: RAC
Date Posted: Thu Nov 21 14:20:17 US/Eastern 2002
Your question on the forum is of interest to many engineers that need to perform failure mode and effect analysis. Functional analyses are usually performed early in the development process before actual hardware characteristics are available. The Reliability Analysis Center has a technical report called Failure Mode, Effects and Criticality Analysis (FMECA) which introduces the concept of functional FMEA. Another source that could be considered is 1998 Annual Reliability and Maintainability Symposium Tutorial Notes for "Failure Mode, Effects and Criticality Analysis , What it is and How to use it", by J.B.Bowles and R.D.Bonnell. One last source is the "Instruction for Preparation of failure modes and effects analysis and critical items list for Space Station", NASA, 1987.

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