[Hi
in the electrical fire procedure if you mix up with switches, you can easily end up with no more electrical power on board, which means no more indication, even the electronic stand-by indicator is gone, no more AFCS (AP goes off, so no more SAS).
In their case it looks like than in conjunction with the fire they had a collective control issue, they moving the collective with no answer from the main rotor, that explains the engine trying to compensate the collective movement going up adding fuel, but has the rotor is not increasing the collective torque NF therefore NR goes high.
with no indication available, the best way to reduce the engine power is then to select IDLE keeping them in AUTO GOV. Very good relation from the crew, then they have managed the descent circling down up to kill the engines just before to land. Unfortunately the gear were not locked down, as you need electrical power to control it in normal or emergency, it was nore up nore down, it then collapse up at touch down.
QUOTE=SASless;11308959]So which came. first....the Chicken or the Egg?
The Crew reported a very serious electrical fire AND a loss of Collective Control AND Dual High Side failures which did not respond to the ECL's and had to be controlled by switching back and forth between Flight and Idle....... am I understanding that is what they reported correctly?
For Coyote,,,,,had they confused the BAT MAIN and BAT MASTER switches.....what would be the result if they somehow switched BAT MASTER to OFF rather than BAT MAIN OFF?
Likewise....what if they had gotten it right and did as the procedure calls for....and turned BAT MAIN to OFF....what would have happened (re instrumentation and controls?[/QUOTE]