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Old 3rd Nov 2007, 18:07   #1 (permalink)
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PA44 electrical system

Can someone who is familiar with the Seminole electrical system explain why there is a 25 A BTB between the AVI buses?

(Click the thumbnail to see a large diagram of the electrical system.)
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Old 3rd Nov 2007, 18:29   #2 (permalink)
 
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looking at it as a sparks i would imanige it is there to cross power the AVI stacks
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Old 3rd Nov 2007, 21:20   #3 (permalink)
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Hardly when the 40 A breaker trips... is it only to protect against a relay failure? Other than this I can't really see the benefit.
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Old 4th Nov 2007, 07:09   #4 (permalink)
 
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It is there in case of a avionics bus relay failure to make sure you do not lose both sides of the avionics bus.

L
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Old 4th Nov 2007, 14:09   #5 (permalink)
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Thanks for the clarification.
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Old 4th Nov 2007, 14:18   #6 (permalink)
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Hi Selfin, I moved this here after a day or so as you were not getting much views in the other forum.
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Old 4th Nov 2007, 20:49   #7 (permalink)
 
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It is there to stop a short on one bus taking out both busses i.e. both nav / com would otherwise die. Not ideal situstion for just one unit turning to toast.
S_cct
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