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: Leroy Meyers
Date posted: Mon Mar 5 15:54:19 US/Eastern 2007
Subject: Preventive Maintenance - - Reliability
I have a subcontractor that is providing an MTBF for a system. He is saying that since certain items will undergo preventive maintenance (ie. TWT, Motor), these items are not part of the reliability model (not included in the MTBF calculation). The subcontractor reasons that these items will be changed before they fail.

I say that this is not valid. Preventive maintenance has no affect on a reliability figure such as failure rate or MTBF. A failure rate for these items should be included.

Am I correct or incorrect?


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