5 ms·
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:
by verytrivial 8y ago
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-LQP_PRELIMINARY.pdf https://reports.aviation-safety.net/2018/20181029-0_B38M_PK-...
- mlindner 8y agoThat'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.
- verytrivial 8y agoAh, Okay, thanks. What remaining automation would be driving the trim wheel in this case that grab-and-hold would countermand?
- heavenlyblue 8y agoYou are still fighting it, aren't you?
- userbinator 8y agoReally? 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 https://www.youtube.com/watch?v=cQirIH_DuAs
- ProAm 8y ago> 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.
- cjbprime 8y agoI think it's definitely to cover other runaway events, e.g. mechanical failure. (And I don't think there's haptic feedback.)