Can the FPV be used to determine AOA
FPV is never purely inertial. (Apart from the mod you mentioned earlier possibly, dont know tbh)
In all other cases FPV uses Vzbi (baro-inertial V/S) as the input, same as V/S on the PFD under normal circumstances.
Hence the UAS (unrel air speed) procedure mentions not to use the FPV whenever air data is affected.
A question (slight thread creep) for the more knowledgeable among us:
Since what mod of the BUSS does the a/c revert to direct law with a subsequent reversion to alternate law once the flaps are selected??
Thanks