Is it Standard oOperating Procedure to start the APU in the air at BA?
Thought they normally started the APU on the Ground at taxi in?
The APU door is open on the back end!
- The APU will AUTO start for the following :
Aircraft in Air mode
Loss of both AC transfer buses
It Takes Approx 30 to 40 secs for the APU to start and the door to deploy before you get power generation avail
- As regards the RAT, not sure if it was deployed or has been ripped from its housing on impact but it will deploy and provide basic generation of power through Hyds for Flight controls and CAPTs panel
RAT willl deploy with the following:
Aircraft in Air mode
Loss of both transfer buses for 15 secs
So NO AC power from either IDG then!..?? Both idgs go bang...unlikely
Both engines...even unliklier...or a combo one Eng and other IDG?
UNLUCKY