Quote:
Originally Posted by FlexibleResponse View Post
5. With the subsequent control law reversion, the aircraft was then doomed to a no-stall-recovery situation with the Stabilizer stuck full up (as the Stab autotrim feature was lost with control law reversion). One of the pilots should have re-trimmed the Stabilizer sufficiently nose down with manual inputs using the pitch trim wheel to allow recovery. This did not happen...why?
I'm sorry but that's just wrong. The Stab autotrim feature was never lost in AF447
AlfaZuluRomeo is correct. According to the Accident Report, a reversion to Alternate Law 2B was caused by airspeed "inconsistency" and this mode did not inhibit the THS Autotrim. The THS autotrimmed to 13 deg nose up in response to the PF's aft stick control movements and remained at that value due to the AOA averaging 35 deg during the descent until impact with the sea.
Unusual Attitude Law Reversion was never activated as none of the discrete values were reached.