Originally Posted by RR_NDB
And FDR is not designed for that.
Is it proven that the Quick Access Recorder data cannot be resurrected from its time in the depths? I don't remember the answer anymore.
Personal opinion only, since the AP and A/THR dropped at the beginning of the AF447 event, it is extremely unlikely that any control inputs came via that route. Any surprise control inputs would then have to be through the basic ALT2 control structure which appears to have been debugged quite well.
(Although the aircraft must have 10000 times more experience in Normal law than in ALT2 law.)