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Forum: Reliability & Maintainability Questions and Answers

Topic: Reliability & Maintainability Questions and Answers

Topic Posted by: Reliability & Maintainability Forum (src_forum@alionscience.com )
Organization: System Reliability Center
Date Posted: Mon Aug 31 12:47:36 US/Eastern 1998

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Original Message:

Posted by: Chris Guebert (Christopher.guebert@l-3com.com )
Organization:L-3 Communications
Date posted: Wed Jul 25 15:14:49 US/Eastern 2001
Subject: MTBR
Message:
I can't find anything that tell me how to calculate MTBR. Any help would be appreciated. Is there a formula?


Reply:

Subject: Reliability Definitions MTBR
Reply Posted by: B.W.Dudley (bdudley@alionscience.com )
Organization: Reliability Analysis Center
Date Posted: Thu Jul 26 10:27:48 US/Eastern 2001
Message:
The definition for MTBR (mean time between removals) is a measure of the product reliability parameter related to demand for logistic support. The total number of system life units divided by the total number of items removed from that product during a stated period of time is the MTBR value. This term is defined to exclude removals performed to facilitate other maintenance and removals for product improvement. As you have an MTBF evaluation, you must identify all the failures in this evaluation that will result in removal action, which means you probably need to have access to an FMEA analysis. Excluding the non-removal failure rates should result in a prediction of MTBR..


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