NTSB

Probable cause: The pilot’s failure to maintain adequate airspeed and his exceedance of the airplane’s critical angle of attack during the landing flare, which resulted in an aerodynamic stall.

Probable cause: The student pilot’s failure to maintain yaw control while landing in gusting crosswind conditions and the flight instructor’s delayed remedial action.

Probable cause: The student pilot’s improper approach and landing flare, which resulted in a porpoised landing.

Probable cause: The pilot’s inadvertent landing in snow adjacent to the snow-covered runway resulting in a collision with runway signs.

Probable cause: The pilot’s failure to maintain adequate airspeed and his exceedance of the airplane’s critical angle of attack during the approach to land, which resulted in an aerodynamic stall.

Probable cause: The pilot’s failure to follow ground control instructions and to see and avoid ground obstacles while taxiing.

Probable cause: The pilot’s loss of directional control during the rejected takeoff. Contributing to the accident were the pilot’s lack of familiarity with the airport runway configuration, which led to his premature attempt to take off, and the airplane’s inoperative landing light.

Probable cause: The failure of the landing gear through bolt primarily due to fatigue during a hard landing, which resulted in a landing gear collapse and runway excursion. Contributing to the accident was noncompliance with the manufacturer service letter.

Probable cause: The total loss of engine power due to fuel starvation when the cap fitting came off the inlet tee fitting on the throttle body/fuel metering unit.