Originally Posted by
wheelsright
Would permanently holding the thumb switch for nose-up, override AND from MCAS?
Yes, but you certainly would not want to do that, as if you literally held the switch up "permanently" you'd end up at the maximum ANU trim configuration.
... would be possible (not desirable) to use electric trim to override MCAS without using the cutout switches. MCAS could be interrupted and corrected every time it kicked in. I suspect it is not entirely accurate... I wonder if anyone has an authoritative answer? None of this excuses MCAS remaining active with unreliable AoA information.
Yes this is entirely possible, and is what happened on the penultimate flight of the Lion Air accident aircraft.