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The pre-MAX 737 has a cut-off switch that switches of the automatic trim system, without also switching of the electric trim (there's another one that switches
by roelschroeven 5y ago
The pre-MAX 737 has a cut-off switch that switches of the automatic trim system, without also switching of the electric trim (there's another one that switches off the electric trim). The 737 MAX also has two switches, but they both switch off the automatic trim (including MCAS) and the electric trim.
So you can't switch off MCAS without also switching off electric trim, leaving only manual trim. But in situations like the Ethiopian flight, you need inhuman strength to control the manual trim (as Mentour Pilot demonstrates in this video: https://www.youtube.com/watch?v=aoNOVlxJmow https://www.youtube.com/watch?v=aoNOVlxJmow). You need electric trim to have any chance to fight MCAS, but you can't enable electric trim without also enabling MCAS. Must be horrific to be in such a situation.
- WalterBright 5y agoThe electric trim switches override MCAS. The LA crew overrode MCAS to restore normal trim 25 times. The EA crew did it twice.