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rijakits wrote:
* **Some fires start at the cables, they are called "electric
fires" for that matter!! Also happened to me in a EC120 where LACU
(light and ancillary control unit) shortened out on a small
switch - the whole dash starts to light up with all alarms then
goes quiet - the whole thing looked like a christmas tree. None of
the switches worked anymore (although at the end it was just one
faulty switch which shortened out and burned about 4 wires).
Luckely the whole thing stopped itself in there and I was able to
fly on to a suitable landing place. However the electric fuel pump
couldn't be switched any more either ( same control unit). If that
/electric fire/* *would have gone* *any further, the mechanical
fuel shut off would have been the only way to shut off the fuel.*
I know you've said you last, but I think we've been talking past each other. The above statement from your post makes it all to clear. If I was flying something as complicated as what you describe above, then I would say you are absolutely correct. Having multiple relays controlling relays that lead to breakers that trip a switch to a highe power pump somewhere within miles of cable...jeesh! I would DEMAND a dead simple mechanical cutoff.
We're not talking about anything that complicated. We're talking about a single wire going from the power supply to a single pump at the back of the plane. If the switch breaks, the pump stops. If the wire burns, the pump stops. If the fuse blows, the pump stops. If the pump stops, the fuel stops. An electrical fire won't have you looking for alternate ways to shut off the fuel; though, it may have you looking for ways to get it running again 8*)
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