Bearfoil
"On seeing the UAS prompt......." The first input was NU, are you saying that was not an attempt to "SET PITCH" (at 5 degrees)?
No. There could have been significant, and changing, vertical currents affecting the flight.
"Why the much larger (larger than 5 degrees) PITCH UP?" Beats me, you are saying the "larger PITCH UP" was PF commanded? Not known.
Same answer as above.
"augmented by manual nose down trim". NO. They were not in the correct LAW to have been prompted: "Use Manual Trim Only".
Direct Law will display the Manual Pitch Trim prompt, because that is all that is available. They were in Alternate Law, so both automatic and manual pitch trim were available. Manual pitch trim has priority, and is faster. The system follows up and reverts to automatic when manual is relinquished.
"At least one simultaneous side stick input, which is forbidden" You are saying they were not attempting to maximize ss input to be certain they were at maximum deflection (authority)?
The CVR should tell us the answer. However, the commanded inputs were predominantly nose up, which is anomalous, to say the least.
"At STALL, the PF should have maintained ND". Not at all. He is trained to prevent loss of altitude. Cannot do that with maintained ND. The STALL warning is not STALL, something he has never experienced in this a/c.
Not so. At "Approach to Stall" the training was to prevent loss of altitude. At "Stall" the technique is to lower the pitch
attitude and accept a loss of
altitude. Most A330 flights take place in Normal Law, where
α Floor will prevent the stall.
α Floor is only available in Normal Law, and is triggered when full back stick causes the pitch angle to reach
α Prot.
[quote]...something he has never experienced in this a/c.
[/QUOTE]
Captain Moody (nor anyone else) had never experienced volcanic ash causing all four engines on his B747 to flame out. Captin Sully had never experienced a double engine failure on his A320 at low level; nor had he previous experience of ditching a jet transport. Captain de Crespigny had never experienced an uncontained engine failure causing power loss, substantial airframe damage as well as collateral damage to multiple systems on his A380. Every once in a while, valiant members of our profession become involuntary test pilots. Mercifully, it is very rarely: thankfully, most of them rise to the occasion and become our heroes.