NTSB

The loss of engine power due to fuel starvation.

The flight instructor’s failure to maintain control of the airplane following an unannounced transfer of flight control during takeoff.

The mechanic’s incorrect rigging of the aileron control cables, which resulted in a reversal of aileron control inputs applied by the pilot during the takeoff. Also causal was the mechanic’s inadequate post-maintenance inspection and the pilot’s inadequate preflight inspection and before takeoff check, which failed to detect the misrigging.

The left seated flight instructor’s improper manipulation of the landing gear position selection lever to the up position while still on the landing roll, which ultimately resulted in a landing gear collapse during a subsequent landing.

The pilot’s failure to ensure that the engine oil cap was installed before takeoff, which resulted in the oil obscuring the pilot’s view through the windshield and necessitated a forced landing on unsuitable terrain. Contributing to the accident were the pilot’s complacency and self-induced pressure to complete the flight.

The student pilot’s failure to ensure sufficient fuel onboard, which resulted in a total loss of engine power due to fuel exhaustion, which resulted in impact with terrain.

The pilot’s failure to ensure that the amphibious airplane’s wheels were retracted before attempting a water landing, resulting in a nose over during touch down. Contributing to the accident was the lack of a checklist available to the pilot.

The student pilot’s decision to continue from visual flight into instrument meteorological conditions, which resulted in a collision with trees and mountainous terrain.

The pilot’s incorrect flight control input during the landing flare, which resulted in an impact with the ground.