767-300 Apu
Hasn't happened to me yet, but....
What would happen if you tried to start a 767 APU without fuel in the main tanks?
From my training notes for our APU:
The APU starter motor is capable of motoring the APU to about 20% rpms (electrically).
Fuel and ignition should be automatically added at approx 7% and APU acceleration monitoring begins at about 16% (As I understand it, it would take about 30 seconds (after 16%) before the APU Controller realised that there was something wrong... However, I read that there are are also flame detection circuits which, I think, will activate after about 15 seconds after 16%)).
With no fuel in the tanks I assume a FAULT light will be generated after the flame detection circuits detect no flame and that fuel (not that there is any) would be cut off at this point, but would the APU continue motoring at 20% with starter power alone, until it burnt out? (or would the starter be automatically cut out at a certain point?).
Thanks.
Rgds.
NSEU