KayPam:
"To finish with, even if you're going to do change your altitude, why climb ?
To get higher up into the coffin corner ? To get above the performance ceiling ?"
1. From DFDR, the a/c attitude at loss of a/p was four degrees nose down and ten degrees right roll. The PF immediately pulled on the stick, to regain level flight (from BEA Interim)
2. The aircraft did not climb immediately, it started climbing ten seconds after pilot input. (Also BEA)
3. The a/c was in Roll Direct as it had changed law to AL2b. So initial left correction started a roll input chase of neutral/level. Some over control, PIO occupied the PF, who was also trying to listen to PNF's anxiety about altitude not pitch. "Go Down!!"
4. We do not know which ADIRU was in control, which had succumbed to "outlier". Do we?
5. There have been incidents in which this type has climbed without pilot input, and remained unresponsive to attempts to descend....(Air Caraibes?)
6. Aren't Pitch (inertial) and AS (computed) latched together in each of the ADIRUs?
7. Where was Pitch displayed? On the two inop PFD' s? On which FD, which are supposed to be switched OFF in UAS?
I apologize for continuing comment after eight years...it seems unfair to the crew to judge them based on information we Know they did not have, and some of which we are not sure.
My intent as always is to help people avoid "going simple" in such a tragic and absolutely complex accident....
Thank you for your kind response....