[Not a pilot] From one of the documents on the Ethiopian Preliminary Report: "If relaxing the column causes the trim to move, set stabilizer trim switches to CUTOUT."
So, if relaxing the column does not allow trim to be moved, what then? Slow down? Immelmann? Something else?
Or does this sentence not apply to the possibility of manual trim? The word "causes" rather than "allows." Is this sentence merely a method of determining whether you have a classic trim runaway? That is, if the runaway stops because the jackscrew is binding, you can confirm this by letting off column back pressure. If trim continues, yep, you have a classic runaway. If no more trim, the runaway has stopped for now.
In either reading, is Boeing not saying that the jackscrew might bind around the time a pilot might be contemplating hand cranking?
Last edited by fotoguzzi; 7th Apr 2019 at 17:56.
Reason: add interpretation