Originally Posted by
Educated Airman
My theory is that the jackscrew did not fail, but rather that the fuselage attach hardware for the jackscrew fell out. The picture of the jackscrew shows the hardware missing, not failed structure.
Repeating theories does not make it so. I read your first post and I doubt you are familiar with the stabiliser ballscrew actuator assembly attachment points on a Boeing 767, the limits of travel of an unrestrained stabiliser, the number of safety mechanisms or with the relationship between the stabiliser and the elevator aft quadrants.
There is not one pin holding everything together. There are multiple pins and bushings with individual retaining devices.