Originally Posted by
megapete
Not sure that answers the question - if the clutch operates at a load manageable by the pilot via the trim wheel would it not operate when trying to use electric trim at the same load - and hence not be effective?
As I understand the system, if the stab was truly jammed in place - either by aerodynamic loads or some physical malfunction - the electric trim motor would turn, the clutch would slip, and the stab would not move. That being said, I know of no actual case of this happening on a 737.