Forum: Reliability & Maintainability Questions and Answers

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Posted by: Jean-Marie CLOAREC (jmcloarec@systra.com )
Organization:IREG
Date posted: Sun Apr 11 22:40:04 US/Eastern 2004
Subject: Canceled MIL (again)
Message:
ABout START 96-2 on "Impact on Reliability of Recent Changes in DoD Acquisition Reform Policies".
Table 1 shows the state of MIL (cancelled, updated, ...). This is very interesting. But is it always relevant ? is there no subsequent updates ? Is there new documents cancelled or updated ? Thank you

Replies:
Cancelled Documents
bwd Tue May 11 14:57:13 US/Eastern 2004

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Posted by: Jean-Marie Cloarec (jmcloarec@systra.com )
Organization:SYSTRA
Date posted: Thu Apr 8 2:54:40 US/Eastern 2004
Subject: Cancelled STD or HDBK
Message:
For RAMS, I'm searching a list indicating what MIL-STD and MIL-HDBK are cancelled, and/or if there is subsistute document.
Thank you

Replies: (list all replies)
Cancelled STD or HDBK
Ken Thu Apr 8 11:53:46 US/Eastern 2004
Cancelled Documents
Mark Mon Apr 12 16:13:15 US/Eastern 2004

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Posted by: B. Kelley (bh.kelley@verizon.net )
Date posted: Tue Mar 23 9:39:40 US/Eastern 2004
Subject: Integrated "Metal Box" MTBF
Message:
Have an issue that I need help with.
I need to determine an MTBF on an LRU that is integrated with COTS products. Pretty much a packaged in a box scenario. All I have to work with is: 1. Vendor supplied MTBF numbers. 2. No metering. Failure data, based on returns we have seen, is limited population. (less than 1000 units per LRU.) Have determined that this will probably not work based results I was generating. Too many variables and assumptions involved to determine failure rates. I came up with a method that I believe is in the ball park, Inverse Summation factored with parts count, but would be interested in hearing thoughts on this. My world is electronics, and fixing what is broke. I'm not a Statistician. Feel free to explain this as if you were talking to the dumbest individual on the planet. Not going to hurt any feelings.

Replies:
Field reliability and MTBF estimation
Larry George Fri Mar 26 17:15:39 US/Eastern 2004

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Posted by: Shanta
Date posted: Fri Mar 12 9:20:47 US/Eastern 2004
Subject: Growth pi factor (piG) in PRISM
Message:
Hi,
In PRISM, Appendix F gives the RACRates Growth Rate Pi-Factor as a function of part type and year of manufacture. It states that "PRISM reliability predictions can be performed as far as calendar year 2005". What happens in 2006? How will piG be calculated then? Is there any factor that I can use right now to predict piG for 2006 and beyond? Thank you for your help in advance.

Replies:
PRISM Growth Model
BWD Thu Mar 25 14:04:38 US/Eastern 2004

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Posted by: Benjamin JEANNETEAU (benjamin.jeanneteau@free.fr )
Date posted: Thu Mar 11 9:45:57 US/Eastern 2004
Subject: HALT
Message:
Hi !
I'm a french student in an 1-year postgraduate degree, in Quality and Reliability of Electronic Components and Systems, in the University of Bordeaux. I need some informations about the "Highly Accelerated Tests" for a project. I search some informations about it and more precisely, which contraints are applied in generally. I know it depend our componants or systems, but it's just for information, to give me some ideas about these tests. I speak about highly accelerated tests and no accelerated tests ("traditional"). So if you have some informations, can you send me please ?? Very many thanks. Benjamin PS : excuse me for my english... :)

Replies:
Accelerated testing
BWD Thu Mar 25 13:54:10 US/Eastern 2004

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