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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: Sean Cloarec ( )
Date posted: Thu Mar 15 3:24:15 US/Eastern 2007
Subject: SSHA versus FMECA
Hello, I've always been a little confuse about the REAL difference between SSHA and FMECA. SSHA relates to "functional failures" and FMECA to "failures". There may be some confuse overlaps. I've seen SSHA that looks like FMECA. Is there anybody having some clarification ???? Thanks in advance. Sean


Subject: SSHA versus FMECA
Reply Posted by: David Dylis ( )
Organization: SRC
Date Posted: Thu Mar 15 8:58:25 US/Eastern 2007
A Failure Mode and Effects Analysis (FMEA) is a reliability analysis. The focus of the analysis is on single events or component failures that will cause a state of unreliability in a system. The objective of a FMEA is to analyze each component/function in the system to determine how each component (or function) can fail and what will be the results of this failure in the system or subsystem.

A Subsystem Hazard Analysis (SSHA) identifies hazards to personnel, equipment, facilities, and program resources caused by loss of function, energy sources, hardware failures, personnel actions or inactions, software deficiencies, interaction of components, inherent design characteristics, incompatible materials, and environmental conditions (within the subsystem).

If you have any additional questions, feel free to contact me.

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