Just to add, it was the normal "runaway trim" procedure-- nothing new. The thing is, this revealed a vulnerability: real pilots in runaway trim scenarios do no

Just to add, it was the normal "runaway trim" procedure-- nothing new. The thing is, this revealed a vulnerability: real pilots in runaway trim scenarios do not do nearly as well as they do in training. And 737MAX ended up testing crews with runaway trim scenarios at a much higher rate than they had been at the past. Some crews failed.