[verytrivial]

The Lion Air directive has instructions on page 41 of their preliminary report that include:

5. If the runaway continues after the autopilot is disengaged:

   STAB TRIM CUTOUT switches (both)  ... CUTOUT
   If the runaway continues:
      Stabilizer trim wheel  .... *Grasp and hold*

This may be an overabundance of caution, or to cover other runaway events, but it reads like "you may need to physically fight the computer even when it has been disabled". Not exactly heartening.

EDIT: A comment below points out haptic feedback to disengage as a reason to grab-and-hold.

https://reports.aviation-safety.net/2018/20181029-0_B38M_PK-...

[ProAm]

> you may need to physically fight the computer

This is the future I look forward to. AI/ML/Autopilot/Companies moving fast and breaking things.... Boeing took that one literally.

[mlindner]

That's incorrect, these have haptic feedback, once you grasp it, it's not going to fight you. It looks for resistance and if it sees the resistance it doesn't continue.

[userbinator]

Really? Here's a video of someone doing it, and it certainly looks like it tries to fight you (and the trim motor continues running) but there's a clutch that starts slipping:

https://www.youtube.com/watch?v=cQirIH_DuAs

[heavenlyblue]

You are still fighting it, aren't you?

[verytrivial]

Ah, Okay, thanks. What remaining automation would be driving the trim wheel in this case that grab-and-hold would countermand?

[cjbprime]

I think it's definitely to cover other runaway events, e.g. mechanical failure. (And I don't think there's haptic feedback.)