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by WalterBright
2372 days ago
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> And if you enable the electric trim switches on a 737 MAX you get MCAS activation. The electric trim switches override MCAS. That is why the steps are: 1. use the electric trim switches to set the trim to normal 2. cut off the electric trim That's all there is to it. > MCAS presented counter to how Boeing defines runaway trim. That's simply false. (And runaway trim does not need definition, Boeing does not define it.) |
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They pause MCAS but do not disable or override it it. The trim switches move the stabilizer slower than MCAS activation thus as seen by the Ethiopian and Lion Air crews using the electric trim switches is tantamount to fighting a losing batle.
1. use the electric trim switches to set the trim to normal
What happens when the electric trim switches don't work? They didn't in the Ethiopian crash.
runaway trim does not need definition, Boeing does not define it.
Sure they do, it's in the QRH plain as day.
Condition: Uncommanded stabilizer trim movement occurs continuously.
MCAS activation isn't continuous, especially not if you're pausing it with the trim switches.