Originally Posted by
DaveReidUK
That appears to be true for manual (wheel) trim, but there's no evidence that it's the case for electric trim.
Dave and others,
At ultra high speed the stab can only be trimmed after releasing up-elevator. This is because of loading to the stab mechanism.
This is the reason for elevator release during upset training.
But if you are at tree top height you can’t do that.
So trim, Manual or Electric is, as the man said, not possible under certain conditions - and those were the conditions encountered here.