NTSB

The pilot’s failure to maintain the proper airspeed and his exceedance of the airplane’s critical angle of attack during a low-altitude climbing turn, which resulted in an aerodynamic stall.

The pilot’s failure to see and avoid a windmill tower while maneuvering at low altitude.

The pilot’s geographic disorientation and his exceedance of the airplane’s critical angle of attack while maneuvering to avoid mountainous terrain, resulting in an aerodynamic stall.

The pilot’s loss of control for undetermined reasons.

The pilot’s excessive brake application during landing on a short runway due to his lack of familiarity with the toe brakes, which resulted in a nose-over.

The pilot’s failure to properly lean the fuel mixture in flight, which resulted in fuel exhaustion, a subsequent total loss of engine power, and a forced landing with the landing gear retracted.

The pilot’s improper fuel planning, which resulted in fuel exhaustion and the subsequent total loss of engine power.

The pilot’s failure to maintain directional control during takeoff, which resulted in a runway excursion and collision with a tree.

The pilot’s failure to maintain clearance from trees during takeoff, which resulted in an in-flight collision, a loss of control, and impact with terrain.