Forum: Reliability & Maintainability Questions and Answers

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Posted by: Phil Friedel
Date posted: Fri Feb 8 18:22:33 US/Eastern 2002
Subject: Reliability and Maintainability Corrosion report
Message:
I'm trying to find a report that I once had written by the head of Reliability and Maintainability within DoD the subject of which was corrosion prevention. I believe it was related primarily to avionics. I think it was an SP- report. Now I can't find a trace of the report and I can't remember the name of the dept head who authored it. Any clues on how to find the report number or author?

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corrosion
b.w.dudley Mon Feb 11 14:12:46 US/Eastern 2002
corrosion
Phil Friedel Mon Feb 11 15:33:43 US/Eastern 2002

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Posted by: D. Fazioli (fazioli_dan@si.com )
Organization:Smiths Aerospace
Date posted: Tue Feb 5 10:25:04 US/Eastern 2002
Subject: Traditional ESS IAW NAVMAP
Message:
Is 2 recorded failures which occurred after cycle 5 justification to reduce the ESS tempature cycles from 10 to 5? This failure data is based upon a review of ESS data with respect to 200 WRAs tested over the last 6 months. These WRAs are ultimately used in a military fighter inhabited environment. For the same 200 WRAs, the number of failures recorded was 120 before completing the 5th ESS tempature cycle. We want to reduce cycle time but not at the risk of jeopardizing reliability of the WRAs. Is this adequate data to convince the customer to reduce the number of cycles to 5 in lieu of 10 temperature cycles?

Replies:
ESS Testing
B.Dudley Thu Feb 14 15:41:48 US/Eastern 2002

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Posted by: Richard Smith (atari_400@hotmail.com )
Date posted: Wed Jan 30 9:25:44 US/Eastern 2002
Subject: RDGT Testing
Message:
I have a question regarding RDGT testing for similar products. For example, if we have three similarly designed products that only vary with the number of installed circuit cards (internally in a rack for example), is it possible to only run one type through RDGT and then form conclusions on the reliability of the other two.
If this is a valid process, which product would be the best one to evaluate ? The low, medium or high complexity product ? (my thinking is the high comlexity, but for cost reasons the medium may be the best). Any comments appreciated.

Replies:
Reliability Testing
Bruce Dudley Thu Jan 31 10:50:08 US/Eastern 2002

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Posted by: Keith Heinzig (keith@solustech.com )
Organization:Solus Micro Tech.
Date posted: Mon Jan 28 19:58:04 US/Eastern 2002
Subject: NTC Thermistor Reliability
Message:
I am trying to locate reliability data on NTC thermistors running above 70 degrees C for extended periods. If anyone could point me to a source of data I would appreciate it.

Replies:
NTC Thermistor Reliability
Bruce Dudley Wed Jan 30 15:59:09 US/Eastern 2002

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Posted by: Sadat Hussain (sadath@nortelnetworks.com )
Organization:Nortel Networks
Date posted: Mon Jan 28 16:32:48 US/Eastern 2002
Subject: ASIC Reliability
Message:
Are there any generic guidelines for ASIC reliability?
-Useful Life? -Average failure rate Things I don't know but want to find out: - Number of machine on/off cycles = ??? - Number of Machine Mini-cycles = ??? - Mini cycle duration = ??? * A mini-cycle is defined as a significant deviation from normal power on operation. From what a vendor tells me, this is the number of "unusual" power up cycles and the info is used for second level attach reliability analysis Can someone please provide me some typical values for the above parameters??

Replies:
ASIC Reliability
B. W. Dudley Wed Feb 6 12:10:59 US/Eastern 2002

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