Hi Owain,
Very interesting post, but what about engine thrust maintaining high pitch up with barely no airspeed?
Originally Posted by Owain Glyndwr
So to get to the high AoAs we see from the DFDR data, it looks like you have to be holding full back stick as well as having the THS at -13 deg.
I noticed, from the tracks, that the first
nose-down attitude recorded during the stall sequence was achieved between 0211:45 and 0212:00.
During the sequence, the PF was maintaining full elevators deflection (-30°) and, in addition, the THS was reaching -13°. He was also maintaining a full left stick order, but the aircraft rotated to the right in high bank. When it started, the airspeed was for the first time recorded under 30 kt (sensed).
Nonetheless, the pitch came down from about 16°NU to 12°ND!
Vertical Speed increased from -10,000 to above -15,000 ft/mn.
The only other parameter changing (beside the right turn) was that N1 was reduced, at the start of this sequence. N1 decreased in 20 seconds from about 105% (CLB) to IDLE (about 55-60%).
PF had "a very high speed" feeling, released SPEED BRAKE, applied CLB again (105°) and 15 seconds later, the aircraft attitude was nose up again without having gathered that much speed (below 100 kt).