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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: 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?


Subject: Reliability data
Reply Posted by: bwd
Date Posted: Mon Mar 5 17:26:54 US/Eastern 2007
I would suggest that you obtain a copy of the European Industry Reliability Data Bank "EIReDA 1998" book. It is available from Crete University Press. The data guide "Non-electronic Part Reliability" also has some data on compressors. For another source, you should consider the purchase of the SRC SPIDR program. This software has all the latest reliability information. You can see the program at: //

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