... has updated his findings about the incidence of runaway trims and stabilizer jams.
Note that there has been at least one incident where excessive force had to be used to break the clutch for manual mechanic trim loose. And another one where trim was only movable after pulling certain CBs.
... has pulled out a percedence where Lear was required to use dual channel inputs for a stick pusher by the FAA in the 60ies