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: Julien NICO (ARZ_St_ELB@compuserve.com )
Organization:Aérazur - Zodiac Group
Date posted: Mon Aug 2 11:45:52 US/Eastern 1999
Subject: Reliability Prediction
Message:
I'm looking for information to calculate reliability of a component. I'm using the NPRD-95 and the FMD-97 to establish some analysis. Unfortunately, for one of our component, there is one part that we cannot find on this document. I try to determine MTBF for a frangible self sealing valve (for fuel application on an Helicopter). Component is composed of two opposite check valve (reliability given by the NPRD) and a metallic part to maintain both check valves open. This metallic part has a predifined level of rupture and in case of crash, shall broke to allow both valves to close and separate the fuel line. I find two failure mode for the part. One, it will fail with a level of stress under the predifine level (rupture of the line without crash), the second, it will not break when needed (fuel line will not separate in case of crash). I don't know how to calculate MTBF of this metallic part and also define the percentage of occurrence of each failure mode. I will really appreciate if someone have method to study reliability of this component (and in fact, reliability of all new component)

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