So what’s your theory on how the rudder got to be trimmed to where it was and when it was trimmed there, FGD, and what is the basis of that theory?
I'd be looking at the flight previous to the accident flight. That flight was on Saturday, 4th Feb, 2017. YPAD-YMEN. Who was on that flight? Was it an empty return from Adelaide, or were there pax being carried? Was there another pilot on board, along for the ride, receiving an informal assymmetrics demonstration?
I don't believe the trim was left at full NL due to an interruption to a functional check. I don't believe this pilot would have been checking his trims with such zeal.