Originally Posted by
Snyggapa
I am surprised that there is so little comment about the potential wiring bundle chafing problem identified above, where if I understand it correctly it seems that a live wire could short to the to stab trim control and drive the stab trim to the stops - without the cutoff switches doing anything about it.
Coupled with the inability to stop it or to use the now tiny manual trim wheel , how many people fancy their chances of winning that argument with the aircraft ?
No.
I am a bit too lazy to look for the link to the wiring diagram, but I remember that the cut-off switches remove power from the whole system early in the diagram and undoubtedly before the wiring bundles carry the command to the tail section.
The hazard involved with the bundle is similar to the MCAS hazard : the pilots must cut-off the faulty command early if they want to save the day.