Originally Posted by
HazelNuts39
More analysis to be done by BEA (and perhaps me). Why did AP and A/THR disconnect 2 seconds before the speeds dropped?
Thanks for enlighting / correlating the facts, HN39, much easier to read (for me)
About the AP discon : AP2 was engaged, it's based on the right side "chain" (pitot 2, ADR 2, IR 2, EFCS 2...) unless I'm mistaken. My guess is that the pitot #2 was the first to freeze, the first to give an value dropping, unmatched with the 2 other speeds (ADR1, ADR3).
@ bear (post 1115) : I'm ready to accept other causes than UAS/icing... providen an alternative theory shows itself either probable/logical or demonstrated (facts, recordings...)
@ grity (post 1120) : Thanks for the pic with the stick moves, very valuable.