RTN11: "Also thinking about inadvertent spins in a type not cleared for intentional spins, and the outcome being a very steep spiral. Recovery is simple enough, but I'd imagine it would be very easy to pull too hard and over stress something. "
A very common error with spiral dive recoveries is allowing the aircraft to pitch-up while rolling level; as an FI you will understand why this is a bad idea but studes seem not to. It's important to educate studes that the tendency to pitch-up (caused by being in excess of the trimmed speed) must be resisted while rolling and then allowed to happen at a controlled rate when the rolling is finished. By getting them to do this intuitively there's a fair chance that the wings will remain attached
HFD