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by HarryHirsch
2447 days ago
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The Seattle Times says that that isn't true: https://www.seattletimes.com/business/boeing-aerospace/boein... In the 737-NG you could turn off autotrim and still have electric trimming. This was changed in the 737-MAX, if you turned on electric trimming you'd also turn on MCAS. That change was poorly documented, and at sufficient airspeed you had to rely on electric trimming because the aerodynamic forces on the horizontal stabilizer would be too high to turn the trim wheel manually. |
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The electric trim switches override MCAS. This is according to Aviation Week, Aug 19, and is consistent with Boeing's bulletins on the matter and with the pitch profile from the flight data recorder - both sets of pilots had overridden MCAS with the electric trim switches in multiple cycles before their crashes.