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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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Posted by:Marc Hughes ( )
Date posted: Wed Jul 14 14:52:22 US/Eastern 1999
Subject: Confidence Limits on Reliability Predictions
Question: I have been asked about confidence limits on failure rates calculated using MIL-HDBK-217 & Bellcore, using the NPRD and vendor data. My experience in determining confidence limits is based on statistical type testing as described by MIL-STD-781 and not based on the reliability prediction. The requestor is continuing to state that you can determine confidence intervals on reliability calculations without test data. Do you know of a method, or a publication that would help? I thought at one time there was a paper written concerning confidence limits on the formulas presented in MIL-HDBK-217 since these formulae are based on test data of components?

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Subject: question on RADC-TR-89-299
Reply Posted by: KH, Lee ( )
Date Posted: Mon Aug 28 5:10:38 US/Eastern 2000
Hi, nice meet you! With my starting reliability analysis job for 2 years, I have been using the Reliability Toolkit published by RAC for my reference book. Especially I am interested in translation to predicted MTBF to field MTBF and use the operational parameter translation identified in appendix A. But there is no specific direction for R(f) selection. I happen to know that it may be included in the Operational Parameter Translation version 2, which can be founded in the table J.4-1 of the Reliability Toolkit. I would like to ask that I can get the Reliability and Maintainability Operational Parameter Translation 2 (RADC-TR-89-299, Vol 1 & 2), AD No.ADB141960L and ADB141961L respectively. If I can buy it, please let me know the price. Thank you for your effort in advence. Best Regards, KH, Lee Reliability Engineer (email id

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