Quote Clandestino:
Originally Posted by Rudderrudderrat
In ALT LAW, when he relaxed back pressure, the aircraft maintained it's nose up attitude as the speed washed off.
Just when did he relax the backpressure? You are acquainted with sidestick traces from 3rd intermediate report, aren't you? A couple of times stick goes forward but quickly gets behind neutral again and stays there before elevators even have the chance to get to neutral.
I think that this may miss the point.
If (as suggested earlier) the THS had remained at NEUTRAL rather than chasing the NU input during a stall, would the PF NU inputs have been enough with elevator alone to maintain nose up into a deep stall? Was it only the added authority of the THS that allowed the aircraft to be kept in the stall?
Perhaps with elevators alone and a THS neutral the aircraft would have dropped its nose, then (had PF kept NU) after getting flying speed its nose would come back up. Perhaps PF was expecting this nose drop 'nodding' behavior? Its what would happen in a lot of gliders and light aircraft and he was glider qualified. The lack of this nose drop possibly
convinced PF that the aircraft could not be in a stall.
Was there any training or flight envelope information available to A330 crews that told of the possibility of deep stall? There seems to have been quite a lot on 'spurious' stall warnings.
So without any knowledge of deep stall, with THS having sufficient authority to hold the aircraft in a stable deep stall so no nodding ND, and previous information about spurious stall warnings: everything seems to be set up for a confused PF.
