Originally Posted by
archae86
Whle I understand the recording function of the forward recorder would continue on the local battery, would not a very large majority of recorded data parameters have ceased being supplied to the recorder immediately on loss of main-bus power? Do we have any general idea of which ones? And between the RAT and the attempted relight of the engines, is there an identifiable point in the sequence in which power source for most of the data parameter sources would have resumed?
Here's a basic list of what should be powered on the battery and the RAT (from an
out of date FCOM)
I
assume the CCR L is used in data gathering, but I don't know if this is forwarded on to the flight recorder during this time. Since the engine parameters were known, I think we can assume that the engine EECs were talking to the flight recorder.