Re:Review of 737 Max Certification Finds Fault with Boeing a...
by WalterBright on Friday October 11, 2019 @08:46PM
(#21229719)
> There's no evidence MCAS upset looks exactly like runaway trim in every case
If uncommanded trim motor action is forcing the airplane into a dangerous dive, it's runaway trim. The pilots must have thought it was runaway trim as they were desperately trying to counter it.
> So I reject the categorical claim they could have recovered with the flip of a switch.
But that's what did happen with the previous LA flight that landed safely.
> it was the only way to get electric motor assisted trim to try and get out of the mistrim.
That's right.
> But MCAS immediately triggered again
The electric trim switches override the MCAS.
So why didn't the EA pilots do that override? I don't know, neither do you. We'll have to see what the NTSB report says.
If uncommanded trim motor action is forcing the airplane into a dangerous dive, it's runaway trim. The pilots must have thought it was runaway trim as they were desperately trying to counter it.
> So I reject the categorical claim they could have recovered with the flip of a switch.
But that's what did happen with the previous LA flight that landed safely.
> it was the only way to get electric motor assisted trim to try and get out of the mistrim.
That's right.
> But MCAS immediately triggered again
The electric trim switches override the MCAS.
So why didn't the EA pilots do that override? I don't know, neither do you. We'll have to see what the NTSB report says.