NTSB

Probable cause: The student pilot and flight instructor’s failure to see and avoid powerlines during a simulated emergency landing, which resulted in a wire strike during a go-around.

Probable cause: Maintenance personnel’s failure to properly secure the tail rotor drive shaft cover, which resulted in the cover departing the helicopter in flight.

Probable cause: The pilot’s failure to maintain directional control and her use of excessive braking during landing, which resulted in a nose-over.

Probable cause: The pilot’s inability to maintain the landing flare, which resulted in the airplane landing hard short of the runway. Contributing to the accident was the cockpit canopy opening in flight.

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.