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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: Tom Thompson (thomas.a.thompson@kodak.com )
Organization:Eastman Kodak Company
Date posted: Fri Oct 10 9:26:40 US/Eastern 2003
Subject: Dormant Failure Rates
Message:
Had a general question in regards to dormant failure rates. I read the RAC document that specifies dormant failure rates for specific devices as applied depending on either vibration, moisture, etc. My question was what data (from manufacturer's screening, testing, etc) was collected and what timeframe does the data come from for the dormant failure rate percentages?


Reply:

BWD Subject: Dormant Reliability
Reply Posted by: (bdudley@alionscience.com )
Organization: RAC
Date Posted: Tue Nov 4 15:19:14 US/Eastern 2003
Message:
The dormant failure rates in the RAC data bases are information that was collected in the 1970s, 80s, and 90, from fielded units. These units were primarily military products in military environments. Some had severe conditions and other sheltered storage. The non-operating prediction model in the RAC PRISM program is based on test, field and failure mode data. The sources included vendors, manufacturers and users. Estimates for the various failure modes were developed along with associated failure rates to develop models and change conditions. The PRISM data base is primarily from the 1990s and is updateable as more information is obtained.


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