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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: Peet vd Merwe (pvdmerwe@grintek.com )
Organization:Grintek Electronic Systems
Date posted: Thu Oct 12 6:13:17 US/Eastern 2000
Subject: Reliability of PCB-Mounted relays
Message:
MIL-HDBK-217 is very severe when it comes to the usage of relays in avionics equipment in the AIF and ARW environments. A typical failure rate given for the following relay, in the AIF environment at 85 degr C, is 15: Relay, High Speed, armature balanced & short, 5V, DPDT, 1A, - TQ2-5V. (Cyclic rate 3.0, Current ratio 42, resistive load.) Have you perhaps got any feild data available which might suggest a better reliability for this type of relay under the above circumstances? or What is your general experience/opinion in this regard?


Reply:

Subject: Reliability of PCB-Mounted relays
Reply Posted by: Nathan Holzhauer (nholzhauer@alionscience.com )
Organization: RAC
Date Posted: Thu Oct 12 16:41:00 US/Eastern 2000
Message:
Airborne environments, ARW and AIF environments in particular, are quite harsh for relays. The MIL-HDBK-217 calculation you obtained is actually a reasonable one, and would likely be a good basis for a reliability analysis.


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