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: Clay Davis
Date posted: Tue Aug 15 2:50:17 US/Eastern 2000
Subject: MTBF Calculations (Customer Complaint)
Message:
Several of our computers have an MTBF of 50,000 hrs. However, a major customer states that if they purchase 100 systems 9 will fail in the first 6 months and another 9 will fail by the end of the first year. Agreed this is numerically accurate (1/(50,000*365*24*100)) - however this does not seem right. I tried to explain that not every failure will cause a system failure (ie a capacitor) but they did not agree without us being able to prove these parts are truly redundant (which they are probably not). Thoughts? There has to be something that I am missing. Thank you for your help. --Clay

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