Electric fires, failures, circuit breakers, and bus bars
Asked by: Chris Carlson 4650 views Aircraft Systems
I am currently flying a TB20, amazing airplane performance.
the question I have is about what to do in the event of an electrical fire or alternator failure. The POH says, just like most, to disengage all electricity, and then slowly bring things back on to either find out what is causing the fire, or, if an electirc failure, to reduce electric load and only bring on the minimum Items needed to preserve power. The TB20 has 3 bus bars, each with their own pull-type breaker. It says, in case of fire, to methodically bring each bus back on, and identify which bus is the problem, and then to identify which item on that bus is the problem, engaging each individual item one at a time.
My two questions are...
how do you test individual items if they dont have a pull type breaker, but only a push to reset? Is there a way of disengaging the non-pull breakers?
Is this a safe practice, is it worth trying to find the faulty item, or should I just accept that it is the entire bus that is bad? The important things (gear, etc) have their own pull breaker.
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