NTSB

Probable cause: The failure of the weld on the airplane’s left main landing gear axle support strut during landing, which resulted in a loss of directional control. 

Probable cause: The student pilot’s failure to maintain a stabilized approach, which resulted in overcorrection with the rudder during the landing, loss of control, and a runway excursion.

Probable cause: The pilot’s failure to maintain directional control during the landing roll in a gusting crosswind conditions, which exceeded the airplane’s maximum demonstrated crosswind and resulted in the collapse of the left main landing gear.

Probable cause: The pilot’s failure to maintain directional control during takeoff.

Probable cause: The student pilot’s failure to maintain a proper landing flare, which resulted in a porpoised landing.

Probable cause: The pilot’s selection of unsuitable terrain for takeoff, which resulted in a loss of control and runway excursion.

Probable cause: The pilot’s failure to maintain the runway heading during the approach in gusting crosswind conditions.

Probable cause: The gyroplane pilot’s failure to maintain rotor speed and aircraft control as he was attempting to return to the runway during a low-altitude simulated engine-out maneuver.

Probable cause: The failure of the left main landing gear axle weld during the landing roll.