NTSB

An in-flight separation of the control stick from the torque tube assembly, which resulted in a loss of directional control during the landing roll and subsequent on-ground collision.

The flight instructor’s improper decision to direct the student pilot to exit the airplane with the engine running, which resulted in serious injury when the student walked into the propeller arc.

The pilot’s failure to maintain adequate airspeed, which resulted in an aerodynamic stall and spin. Contributing to the accident was the failure of the pilot to perform an adequate preflight inspection, to include removal of the pitot tube cover.

An encounter with mountain wave turbulence and windshear that exceeded the climb capability of the airplane and resulted in impact with terrain.

The pilot’s inability to extend the main landing gear due to incomplete maintenance, which resulted in a partial wheels-up landing and the mechanic’s failure to follow proper maintenance procedures that led to the loss of main landing gear system hydraulic pressure and the subsequent failure of the main landing gear to fully extend.

The pilot’s failure to recognize and avoid airframe icing conditions, which resulted in a loss of airplane performance and a subsequent loss of control and in-flight break-up.

The pilot’s loss of airplane control resulting in an aerodynamic stall while executing a steep turnaround during an aerial application flight.

A total loss of engine power due to a blocked fuel tank cap vent hole, which resulted in fuel starvation. Contributing to the accident was the mechanic’s and the pilot’s inadequate inspections of the fuel tank cap.

The pilot’s loss of directional control when his foot became stuck on a protruding bolt in the airplane’s floorboard.