NTSB

The pilot’s inadequate preflight inspection, which resulted in his inadvertent departure with the tow bar connected to the nose wheel, and the low approach while returning to the airport, which allowed the tow bar to contact trees.

The pilot’s failure to maintain airplane control and improper recovery from an unusual attitude, which resulted in an in-flight breakup.

The pilot’s failure to maintain directional control on landing, which resulted in a runway excursion and subsequent nose-over. Contributing was the pilot’s lack of experience in the accident airplane.

Failure of the landing gear motor, which prevented the gear from extending fully to the down and locked position, which resulted in a gear collapse on landing and a subsequent loss of directional control.

The mechanic’s improper maintenance, which resulted in the crankshaft expansion plug dislodging in flight and a subsequent forced landing.

The airplane’s impact with a deer during takeoff.

The separation failure of a landing gear system hydraulic line and its compression fitting during cruise flight, which resulted in a partial gear up landing.

The pilot’s failure to use full power during takeoff and his delayed decision to abort the takeoff, which resulted in a runway overrun and subsequent impact with terrain.

The pilot’s decision to land at night without runway lighting, which resulted in a collision with an object.