[Wings-n-Wind]

The MU-2 has always been very "slippery" at lower airspeeds --worse when compromised by asymmetrical thrust.

..And due to the design of the flight controls...
...requires prompt recognition and execution of engine-out procedures in order to handle the emergency and land safely.

Dr. Inhofe - RIP

[wrench]

The MU-2 dowan’t have ailerons, it uses spoilers.

In an engine out condition, you bank toward the good engine, but end up losing total lift due to the spoiler killing lift on the wing with the operating engine. Very high power setting is needed to offset this, and a turn away from the bad engine may not be possible due to not having enough power available to sustain level flight.

This will cause either a drop in airspeed or altitude. Neither are good if at low altitude maneuvering to land.

WAG: He was too low to dead stick it, and the available engine only caused him to depart controlled flight not fly the aircraft.