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: Leroy Meyers
Date posted: Mon Mar 6 15:16:54 US/Eastern 2000
Subject: Prediction "Degradation"
Message:
I work at a fairly small company. For our main product, a $200,000 unit for military communications, we have always advertised a certain MTBF which was obtained using MIL-HDBK-217F. Now, we are switching to all surface mount components, which hurts the prediction significantly because of the switch from B level or 883 parts to commercial non-hermetic parts. I could make assumptions, and give the commercial parts a better quality factor than 217 indicates. Or, I can switch to a different prediction technique such as Bellcore or Prism, or which I have no experience. Any opinions or other suggestions?

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