And this is the point: If at >any time< during those 2 dozen times when the Lion Air crew re-trimmed the aircraft back to normal, they had executed the published procedures (turning off the autopilot trim and the electric trim and then using the trim wheel to trim off yoke pressures), they could have flown that plane home. BTW, it's virtually the same procedure used for "runaway trim."I can't find the Ethiopian chart yet but this article shows the data from the previous Lion Air crash and you can see for yourself that the pilots override the MCAS dozens of times before it finally destroyed the aircraft. At the end the jack screw jams and you can see the control forces jump hugely.
Right--over 2 minutes after the anomaly began, and as airspeed continued to build, they finally turned off the trim and kept it off. At that point the control pressures may have been too great for use of the manual wheel >or< the trim motors to have had any effect. Analogy: Discharging the fire bottle after watching the fire light blink for two minutes--the spar has burned through. That's not a "defect."As for the Ethiopian pilots, I saw a chart of the black box recording and they made two attempts to fix trim with the power trim before MCAS did a huge negative trim for some reason even though the pilots had clearly been trying to use the power trim to override it. That's when they cut the power and tried the manual trim, which the voice recording shows was jammed.
This is all covered in previous threads and posts here.