Thanks KenFoggo... I'm still LMAO about the B777 sim trying to shake itself to pieces... Good one. I have some spin experience but not enough to be an authority.
I recall a Channel Express F.27 freighter had it's cargo shift aft on approach and it went into a flat spin. There was something similar about a BAC-111 spin test in which the spin parachute was of no help. Were these flat spins indicative of heavy aircraft characteristics or just reflective of the special circumstances.
Roethesod about the Mu-2 which I have never flown personally, I gather they all have some difficulty with power levers (constant speed pitch levers)down between the pilot's seats being vulnerable to being knocked or having a friction nut deficiency. I gather that it is not uncommon for one of the power levers to retreat without the pilot noticing.
This plane is a well known widowmaker and the issue seems not with the engines, but with deficient power levers.
I would add my voice about the structural failure risk to airliners. Engine pylons are designed to shear if the engine seizes, or when torque is too great. Remember the L-188 Electra (a la spinning a C-130/P-3) had speed restictions imposed because at 400kt the engines shook off their mounts. Engine mounts were never designed with strength in sideways motion.