NTSB

The pilot’s failure to maintain clearance from snow-covered terrain while maneuvering at low altitude.

The pilot receiving instruction’s loss of directional control on landing with a crosswind, which resulted in a runway excursion and the left main landing gear collapsing.

The student pilot’s failure to maintain helicopter control while maneuvering to land, which resulted in impact with an airplane and a hangar.

The pilot receiving instruction’s failure to maintain airplane control during landing with a crosswind, which resulted in a bounced landing, and the flight instructor’s delayed remedial action, which resulted in a loss of control during the go-around.

The pilot’s failure to maintain a proper descent rate, which resulted in a hard landing, and his subsequent loss of airplane control during an attempted go-around.

The pilot’s failure to maintain directional control during an aborted takeoff, which resulted in collision with a barricade.

The pilot receiving instruction’s misunderstanding of the flight instructor’s instruction and the pilot’s and the instructor’s insufficient use of rudder while adding power to the operating engine, which resulted in the airplane rolling left and the wing striking the ground. Contributing to the accident was the flight instructor’s delayed remedial action.

The pilot’s failure to properly configure the amphibious airplane for a water landing, which resulted in it flipping over.