A320 APU start in Emerg Electrical Config
Mate of mine posed this at me.
To start or not to start?
FOR
Once the emerg gen is up and running its possible to start the APU. Its better to have all your electrics back than simpley having only your ESS busses powered.
AGAINST
If youve lost your electrics all at once then something is seriously wrong in the electrics dept. The APU gen may be thrown off-line and all youve done is drain the batt during the start.
It'll depend on what the situation is at the time but I favor starting it if its a dual eng gen prob (for example a gen failure and the other a IDG failure simultaneusly) and NOT starting it if both gens are fine but are continuously being thrown off-line for no obvius reason.
Any comments?