Clearly MCAS is not a runnaway trim condition, otherwise we would be reaching for the cut-out switches every time the speed-trim operated. I think some people here do not realise that the trimmer doing its own thing is operations normal.
And the auro-trim systems are always mis-trimming the aircraft (the trim inputs by the speed-trim system are always wrong, and you always have to re-trim manually). So at what point does ‘operations normal’ become ‘operations abnormal’? At what point do you assume that the trimmer has gone awry..??
Silver
DING DING DING We have a winner!
That’s one of the biggest elephants (gorillas?) in the room. By the time you’ve thought “hmm, that’s not quite right” at low-level the situation has gone from nuisance to critical. The 737 trim is on the move all the time, be it from pilot inputs or STS/MCAS/Autopilot. Clickety-clack is the most heard noise on a 737 flight deck as the trim wheel spins it’s merry way backwards and forwards. Add an unreliable airspeed scenario to the above and no wonder things go from bad to worse. I really feel sorry for the crews who were dumped in this situation.
