stall occurred around 02:11:00
Just for the record.
Totally agree with this.
I like to add that 2nd Speed drop took place around
@ 2:11:50
and triggered the
NAV ADR DISAGREE message after 10 sec and
FPV Flags on both PFDs.
This event was not caused by Pitot Icing but due to the insensivity of a
pitot probe at hi AOA and pitch (40 + 15) and air flow disturbance due to
fuselage at such a flight path.
"At around 2 h 11 min 40 ,the Captain re-entered the cockpit.
During the following seconds, all of the recorded
speeds became invalid and the stall warning stopped.
Note: When the measured speeds are below 60 kt, the measured
angle of attack values are considered invalid and are not taken into
account by the systems.
When they are below 30 kt, the speed values themselves are considered
invalid.
The altitude was then about 35,000 ft, the angle of attack
exceeded 40 degrees.... The airplane’s pitch attitude did
not exceed 15 degrees......
At 2 h 12 min 02, the PF said
"I don’t have any more indications", and the PNF said "we
have no valid indications".
Around fifteen seconds later, the PF made pitch-down inputs.
In the following moments, the angle of attack
decreased, the speeds became valid again and the
stall warning sounded again.
........
The angle of attack, when it was valid, always remained
above 35 degrees. "