NTSB

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.

The pilot’s poor preflight planning, during which he failed to verify the proper procedure to activate the runway lights; his inability to locate the airport without lighting; and the airplane’s subsequent low-fuel state as he circled looking for the airport, which necessitated a precautionary off-airport landing, during which the nose landing gear separated.

The pilot’s failure to maintain airplane control during landing, which resulted in the right tire contacting the runway first followed by the left wing.

The student pilot’s failure to maintain the runway heading during takeoff, which resulted in impact with a snowbank and a subsequent nose-over.