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Another start contactor/switch question

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nuckolls.bob(at)aeroelect
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Posted: Thu Sep 20, 2012 11:49 am Post subject: Another start contactor/switch question

At 02:41 PM 9/20/2012, you wrote:

 	  Quote: 	
		  



Thanks Bob, good succinct answers.  Pretty much what I was 

thinking.  I am using an external contactor and push button sw, so 

the design lends itself to go either way.



Do you think the ground fault risk is high enough to warrant adding 

a CB assuming good wiring practices?



--------

Dan Morris


	


   Haven't the foggiest notion. I don't do reliability studies

   for the purpose of assigning go/no-go decisions for risk.

   My personal design philosophy has been to drive toward

   failure tolerance . . . assume that ANYTHING can break

   over the life-time of the airplane. Then design architectures

   such that no single failure gets you into an unmanageable

   condition. I would say that a starter in un-commanded

   operation in flight could be difficult to manage so the

   decision to minimize that risk has nothing to do with the

   magnitude of risk.

   Bob . . .

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