With regard to post 1087's link. Not rubbish at all.
For example this quote from the original article:
The real problem probably occurred immediately after the pilot flying grabbed the Sidestick and took over manually.
Unfortunately,airline pilots rarely practise hand-flying at high altitude and almost never do so without A/THR engaged.
As a result,we forget that the aircraft is very sensitive to control inputs at high altitude and overcontrol is the usual result.
About a month and a half ago I concluded over on the tech thread that this was initially a roll PIO event as best I could figure from the data. It really stands out as unusual in the period leading up to the stall (well, that and the high nose attitude.)
Call in overcontrol if you wish, but if it was really PIO, it was worse than that as far as demanding a response from the pilot.
The guys with the minimalist approach to aircraft control will probably never see PIO. If you are not that type of pilot though, you could have an unpleasant encounter.
PIO is funny, in that it is hard to stop once started.
, and it requires a change in piloting strategy to stop it.