Why WAS the THS stuck up? Down inputs were recorded or mentioned. The BEA emphasizes the plane was fully functional and responsive, so why was the THS stuck up and remained stuck up?
Check Technical Log forum
It's explained (many time by takata and some others) with drawings of the system logic and also graphs extracted from BEA report N*3
Make your searches .. be informed.
BTW the THS is not
stuck (blocked)