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by batat
2632 days ago
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MCAS can be disabled, but pilots says this may not help in some situations: > On the simulator when the stabilizer was "on a dive" at maximum angle, me and my colleagues weren't able to recover a plane. > If you follow Boeing bulletin, but start the procedure too late, it will only make things worse. Simpler solution (in case of problems right after takeoff) is to release the flaps at least to the first position. This will disable MCAS and give you an additional time. Source: https://denokan.livejournal.com/204046.html (Russian) Google translate: https://translate.google.com/translate?sl=ru&tl=en&u=https%3... |
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They procedure just disables the electric motor that MCAS is using to adjust the trim down. MCAS will still be sitting there sending trim down commands that get ignored.
Problem is, that electric motor is used by the manual trim adjust buttons too, so they stop functioning too. Following the procedure results in a nose down trim that pilots have to correct by manually turning the trim wheel, and it turns out the aerodynamic forces may be too strong for that procedure.