Forum: Reliability & Maintainability Questions and Answers

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Posted by: Richard Smith
Date posted: Wed Nov 20 13:59:39 US/Eastern 2002
Subject: Looking for MIL-STD-882A System Safety Document
Message:
If anybody know of a location for MIL-STD-882A on the web, could they please provide a link. I have rev's B,C and D, but need to refer to 'A' for a specific program.
Thanks in advance.

Replies: (list all replies)
Mil-Std-882A
Ken Thu Nov 21 18:48:47 US/Eastern 2002
MIL-STD-882
William H. Crowell Fri Nov 22 4:41:18 US/Eastern 2002
MIL-STD-882A
Mark Thu Dec 12 13:16:16 US/Eastern 2002
Thanks
Richard Smith Tue Dec 24 11:22:35 US/Eastern 2002

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Posted by: Xavier
Date posted: Mon Nov 18 17:31:16 US/Eastern 2002
Subject: Silicon Reliability Certifications?
Message:
Does anyone know of any silicon reliability certifications? Specifically, I have successfully achieved the Certified Reliability Engr from ASQ but would like to gain some more technical knowledge in the Si reliability arena.
Thank you for your help.

Replies:
Silicon Reliability
David Dylis Tue Feb 18 15:27:42 US/Eastern 2003

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Posted by: Michelle Li
Date posted: Fri Nov 15 14:53:07 US/Eastern 2002
Subject: possible missleading of 217 on chip ceramic capacitors
Message:
I am working on reliability prediction for a commercial avionics flight display. I found that surface mount ceramic capacitor failure rate is about 35% of total failure rate of all elelctronic assemblies ( exclude LCD assembly and lamp assembly) by using 217. I actually did not choose 'Chip Ceramic' subcatogory, I chose 'general purpose, ceramic capacitors'. If I used 'chip, ceramic', the total failure rate of chip ceramic capacitor will go to 50%.
If I just use PRISM for surface mount ceramic capacitors and still use 217 for other parts, the ratio will drop to 5%. Can someone tell me if surface mount ceramic capacitors cause about 35% of failures in field? It is hard for me to believe so. I guess that they might cause 1% to 5% of failures in field. If someone works on commercial avionics field reliability, I would appreciate if you can give some information about field performance of the surface mount ceramic capacitors. Thank you very much. Michelle Li

Replies: (list all replies)
Capacitors
Rob Poltz Wed Nov 20 16:47:58 US/Eastern 2002
Micro Crack On Ceramic Capacitor
CY Lim Mon Aug 2 5:39:09 US/Eastern 2004

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Posted by: Michelle LI (Michelle.li@goodrich.com )
Date posted: Fri Nov 15 8:38:55 US/Eastern 2002
Subject: Functional FMEA
Message:
I have a question about functional FMEA. We have a dual avionics system. Driven by safety analysis, we need to perform a functional FMEA only for miscompare function. Miscompare function is not a stand alone function. The circuits, such as microprocessor and memeory, which do miscompare is shared by other functions. I could not find any guidelines about this kind of functional FMEA in ARP4761 or ARP5580 or any FMEA books. I would appreciate if I can get help on this issue.
Regards, Michelle Li

Replies:
Functional FMEA
BWD Thu Nov 21 14:20:17 US/Eastern 2002

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Posted by: Nicole
Date posted: Fri Nov 15 8:27:57 US/Eastern 2002
Subject: AMSAA or Observed MTBF??
Message:
I encountered a problem during my growth testing. After a period of 1500hrs of testing and i collected 4 failures. Should i use the AMSAA model to compute the results or simply divide the test duration by the number of observed failures? In this case i have only 4 failures so which method is more accurate? The AMSAA model passed the Goodness of Fit Test however. I understand taht AMSAA model is not too suitable when the number of failures are too small right?
Please advised?

Replies:
Growth Testing
BWD Mon Nov 25 15:40:00 US/Eastern 2002

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