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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: Jean-Marie CLOAREC ( )
Organization:LIGERON SA
Date posted: Wed May 22 12:13:40 US/Eastern 2002
Subject: Time definition
Can anyone give me the definition/difference between "elapsed time" and "operating time". Which of this 2 times must be used for FMECA, prédictions, .. Thanks


Subject: Time definition
Reply Posted by: Nathan Holzhauer ( )
Organization: IITRI
Date Posted: Thu May 23 12:43:04 US/Eastern 2002
From the Reliability Analysis Center's "Failure Mode, Effects, and Criticality Analysis (FMECA)” publication, pg. 70: Operating Time (t): The total operating time that the indicated item is expected to function during the mission scenario. The value commonly used the total life cycle time of the equipment. As for Elapsed Time, I would assume it to refer to a time (tx) somewhere into the total life cycle of the equipment that is noteworthy, possibly for mission reasons.

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