411A - this is where it is going to go, gross pilot error. Doesnt make sense considering the pilots for 587 were not raw but experienced and that the speed of the rudder movements was, as recounted above, impossible to have been implimented from the pedals. Now what else could whip a rudder around liek that? Geese? Lightening (nope blue sky)? 747 wake? The force has to be monstrous, sudden, and invite a reflex snap back.
I just find it very hard that for all these decades professional pilots have been flying the Airbus using skills that are grossly negligent. First it is not the habit of the industry and second more Airbus' would have fallen from the sky by now - consider all the rudder use during bad conditions to date.
So, if it isnt the 747 wake, if the weather was pristine, if it wasnt large birds, if it wasnt a material failure - why dont we start to be brave enough to consider what else could produce such force rather than shoot down the old rabbit hole "pilot error".