When I first started flying GA planes I did the control check and assumed that seeing the ailerons move was sufficient to check that item off. It never occurred to me that you _could_ reassemble the plane in such a way that the ailerons would be inverted. Some older pilot mentioned his friend wrecking a Mooney on takeoff that way (luckily walking out of the wreck) and it scared the hell out of me.

Hats off to the Air Astana guys. That's some solid debugging work and very impressive ability to keep calm and focused under pressure.