PA44 electrical system

[selfin]

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.)

[Dysonsphere]

looking at it as a sparks i would imanige it is there to cross power the AVI stacks

[selfin]

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.

[L-Band]

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

[selfin]

Thanks for the clarification.

[BRL]

Hi Selfin, I moved this here after a day or so as you were not getting much views in the other forum.

[Short_Circuit]

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