> Pilots are trained for how to recover from these conditions and regain trim authority. I agree with all of your corrections except this one. I've read that t

> Pilots are trained for how to recover from these conditions and regain trim authority. I agree with all of your corrections except this one. I've read that this yo-yo or rollercoaster maneuver was described in old 737 manuals decades ago, but then removed. It's not in the current manuals and I haven't heard anyone else claim that it was ever trained for by airline pilots, either back then or now. I get the impression that Boeing decided some decades ago that needing to retrim without the motor and at extreme airspeeds and aerodynamic load was so unlikely that they didn't need to prepare pilots for it. This would probably be true if they hadn't introduced a system that makes the stabilizer try to kill you, and then tied the off switch for that system to the off switch for the trim assist motor. (A reason to be pedantic on this point is that it's important to know whether the lack of having performed this maneuver can be reasonably described as a pilot error.. although in the MAX cases there probably wasn't enough altitude to perform it anyway at the speeds involved.)