Originally Posted by xcitation
The initial pull up immediately after AP disconnect IMHO was because pitch was 0 deg, altitude descending. For some reason his 2/3 deflection pull up maintained a level altitude for a number of seconds (downdraft?).
Illusion, deceleration, and weather.
- Illusion because altitude recorded is "indicated", then partially false at UAS point.
- Deceleration, because autothrust started to reduce N1 by 16% seven seconds before UAS event.
- Weather because there was an up/down/up.
Originally Posted by xcitation
Subsequent pull ups IMHO were because he saw the red and black barber stripes (low speed stability protections for stall only showing in ALT/DIR LAW) on his speed and mis-interpreted as the red and back horizontal striped ladder of overspeed. The actual speed showing as being low - but he understood speed had failed. In normal law the low speed bar is amber.
Happy if someone can debunk/support my speculations
Easy, there is no low/high speed stability in Alternate Law 2b,
No red and black striped "barber/ladder".
I already mentioned that many times: SPEED LIMIT FLAG ON PFDs (both).
Neither did the speed "fail" at this point; they "failed" (NCD) when sensed under 30 kt during the stall sequence, much later.