Originally Posted by
BugBear
As I understand the potential, this is a .25 Megawatt system. The third loss of (two) generators melted the Emergency Batteries in the aft EEBay., with arcing present.
Dunno any more than that... (From PPRune 12 Dec. 2012)
In that thread the Captain had more to say. Worth a read.
Understood the batteries are in a titanium closet now, but the current and load must-have been sumthin
Regards, bb. ( Somewhat curious )
Re AI171, if the APU started, when and how long to regain flight controls and instruments? Quickly enough to power up and climb???? I don't believe that was flare....would Fadec have come in on standby power???? If the Emergency Batteries burned up here as in United/New Orleans, the APU won't start.... Is Fadec in any way APU reliant. Sorry for all the questions ....when one knows little, he has many too many questions??
FADEC has its own Permanent Magnet Alternator to power it, so it runs if there’s NO other power available, it’s all internal to the FADEC.
tdracer has covered this several times.
IF the RAT was deployed, flight controls are powered, there is no appreciable switchover time from the normal hydraulics. It deploys in a second. I’ve done in-flight RAT checks on three types and the transition is imperceptible. Note, much older designs, so it’s likely to be better in the 787.