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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: Bill Crabb (bill.crabb@verhaert.com )
Organization:Verhaert Design & Development N.V.
Date posted: Fri Jun 23 4:38:11 US/Eastern 2000
Subject: Derating
Message:
Derating rules for MIL-SPEC components are given in MIL-STD-975, the GSFC PPL-21, JPL-D-8545, NAVSEA TE000-AB-GTP-010, ESA PSS-01-301, MIL-HDBK-1547, and in the RAC Reliability Toolkit. However I want derating rules for commercial components in the commercial environment, but so far I can find nothing. Are there any rules or guidelines out there? (Look forward to the new RAC publication on this subject - next month?). Bill Crabb, Componbent Engineer/Parts Specialist.


Reply:

Subject: Derating of Commercial Parts
Reply Posted by: Bruce Dudley (bdudley@alionscience.com )
Organization: Reliability Analysis Center
Date Posted: Mon Jun 26 14:56:08 US/Eastern 2000
Message:
Your question regarding the commercial part impact of derating is very interesting. With the exception of the temperature limitation on commercial parts the derating parameters should be relatively the same. In the Reliability Toolkit, Commercial Practices Edition, two levels of environmental impact and derating are cited. The benign environment situation should be applicable for commercial part application. The new RAC Derating Guide, due to be published next month, also has two levels of derating one for severe conditions and another for benign environments. These derating parameters are not configured exclusively for either miltary or commercial parts. The derating parameters should be effective for either part as were the ones in the Toolkit.


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