Dave, depends on what the design (1970s ?) assumed to be ‘severe out of trim conditions’.
The aircraft trimmed state - the pilots flew the aircraft there (as zzuf #3658 dive) or misplaced tail due to an abnormality - elect trim runaway (where restricting the use of pilot elect trim could be required for safety).
In my previous posts ‘force’ is probably misused; the discussion relates more to torque and hinge moment. Thus the relative location of the point of tail hinge to air load is important.