NTSB

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.

The pilot’s failure to maintain clearance from a parked airplane during taxi operations at night.

The pilot’s improper decision to attempt an off-airport departure from rough terrain without inspecting the takeoff area, which resulted in a collision with a shallow rut during takeoff and the nose landing gear collapsing.

The pilot’s failure to maintain directional control during the landing roll on a runway with icy patches, which resulted in impact with a snowbank and a subsequent nose-over.

The failure of the tailwheel attachment tube during the takeoff roll, which resulted in a loss of directional control, a runway excursion, and the left main landing gear collapsing.

The airplane hydroplaning while landing on a wet runway, which degraded its braking capability and resulted in a runway overrun onto grass and mud and the nose landing gear collapsing. Contributing to the accident was the pilot’s improper decision to land the airplane until it was near the runway midpoint due to fog over the approach end of the runway.