A320 APU
Hi guys,
In the securing aircraft section FCOM dictates that the batteries should not be turned off until the APU flap is closed. If you are on external power, is it necessary to wait for the APU flap to be closed before turning off the batteries?
Also, is APU fire extinguishing available with external power ON and batteries OFF when the APU is running?
Thanks, couldn't find any information on these or maybe I've missed it somewhere!