[Don Corleone]

You have to hand crank the manual trim wheel. It takes many many turns to accomplish what a click of the trim button will do.If they have never done it maybe they didn’t understand how hard it is. When they turned the auto system back on they sealed their fate. I put it down to a combination of panic and poor training. (30,000 + hours, most of it in Boeings)

[RitchieAprile]

is there no such thing as unassisted positive pilot control of an aircraft of this type? it would seem (to me a layman) that there ought to be a way to turn off all the automated systems in an emergency.

[rjsimmon]

Another article states: "suspect data from an airflow sensor" was what caused MCAS to react. I am still curious to know if the Ethiopia based aircrew neglected to turn on the AOA probe heater?

[Capt. Tom]

You have to hand crank the manual trim wheel. It takes many many turns to accomplish what a click of the trim button will do.If they have never done it maybe they didn’t understand how hard it is.

It would be like a modern day car driver losing the engine and the power steering while underway and not realizing how hard it is to steer the car. - Tom