Forum: Reliability & Maintainability Questions and Answers

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Posted by: Min Hee
Organization:Dong-A university
Date posted: Wed Feb 25 10:25:11 US/Eastern 2004
Subject: Cha
Message:
My question is similar point with previous question.
On reliability demonstration, I will demonstrate 0 failure at one equipment during test time. I have to determine confidence interval and I want to know what value and criteria are applied in usual case. Thanks.

Replies:
R Demo Zero Failures
Jorge Romeu Wed Mar 3 9:36:07 US/Eastern 2004

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Posted by: Rel Engr
Date posted: Fri Feb 20 15:16:51 US/Eastern 2004
Subject: Question on Confidence
Message:
I am planning on conducting a reliability study using time censored data assuming a Chi-Square distribution. Assuming 0 failures, I have been estimating the appropriate length for the study to maintain a desired reliability and confidence. As I am limited on study length, I am considering lowering either confidence or reliability. Although I am reluctant to reduce confidence, it seams to be the option preferred by management to maintain a high minimum reliability. I am unclear on the effect of lowering confidence and was hoping someone could go into detail on the effect.

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Confidence Levels
Jorge Romeu Wed Mar 3 9:27:03 US/Eastern 2004

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Posted by: James Bauer (jim.bauer@duncanaviation.com )
Organization:Duncan Aviation
Date posted: Wed Feb 11 16:58:32 US/Eastern 2004
Subject: LRU undetected failure rates
Message:
In performing a system safety analysis for an aircraft installation I used the product manufacturer's Failure Modes and Criticality Analysis as a starting point for my system level analysis. The manufaturer maintains that the undetected failure rate (failures not detected by Built In Test) for LRUs interfaced with the system can be assumed at 5% for digital components and 10% for analog LRUs. Is there any data or documentation to substantiate this position?

Replies:
Undetected Faults
BWD Thu Feb 12 14:18:03 US/Eastern 2004

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Posted by: Cong Nguyen (cong.nguyen@drs-ss.com )
Organization:DRS Technologies-Signal Solutions
Date posted: Thu Jan 29 13:36:22 US/Eastern 2004
Subject: Service Life
Message:
Please show me how to calculate "Service Life" of an electronic product. I appreciate your help very much.
Sincerely, Cong Nguyen

Replies:
Service Life
BWD Mon Feb 2 15:09:14 US/Eastern 2004

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Posted by: Johnson
Date posted: Mon Jan 12 22:46:23 US/Eastern 2004
Subject: RDF 2000 (UTEC 80810)
Message:
I'm look for the standard of RDF 2000 (UTEC 80810) from France Telecom. Dose anyone know how to get it? Any information about calculation of tunnel reliability of Optical Transmission Network will be welcomed. Thanks.

Replies:
RDF 2000
Jean-Marie CLOAREC Thu Jan 15 4:40:52 US/Eastern 2004

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