emu787:
did the AFCS detect low speed - about to get a stall or low speed buffet boundary approaching (erroneous airspeed information) and the computer pitched the aircraft nose down and applied full power thinking this is the way to recover. This would almost certainly result in instantaneous excessive speed that would test the integrity of the airframe to its limit.
It seems very improbable considering A/THR and AP OFF => Alternate Law2 (protection lost) due to unreliable Air Data (ADR disagree). Moreover, Air France ADIRUs (Honeywell) are different from Quanta's (Northrop-Grumman).
S~
Olivier