Originally Posted by
deltafox44
So... it seems that Boeing confirms this procedure that I had taken for a joke : before trimming, push the stick forward :
That looks like they are admitting the jackscrew can be prone to binding right at the time when you can least afford it to, when it has an extreme load on it in the wrong direction.
Is it possible once the loads were too great the jackscrew locked up and they never had time/realisation to unload it enough to free it?
Non pilot here, studying for ppl though and very interested in electromechanical engineering.