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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: Craig Benton ( )
Date posted: Thu Aug 22 15:59:43 US/Eastern 2002
Subject: Mean Time Between Unscheduled Maintenance (MTBUM)
I am trying to find a source for a full explanation of this subject (MTBUM). Could anyone direct me? Thanks ahead of time.


Subject: Definition for MTBUM
Reply Posted by: David Dylis ( )
Organization: Reliability Analysis Center (RAC)
Date Posted: Fri Aug 23 16:13:26 US/Eastern 2002
As ou have identified, MTBUM is an acronym for Mean Time Between Unscheduled Maintenance Action. MTBUM is simply the total number of operating hours divided by the total number of unscheduled maintenance events. A description of this metric and related metrics is available in AFOTEC Pamphlet 99-104, Operational Suitability Test & Evaluation, paragraph Logistics Reliability. The pamphlet can be viewed on-line at If you have any additional questions, feel free to contact me.

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