NTSB

The pilot’s inadequate preflight inspection of the floats, which led to his subsequent attempt to depart from a lake with damaged floats and led to a loss of roll control and the right wing impacting the water.

The pilot’s improper fuel planning, which resulted in a total loss of engine power due to fuel exhaustion and a subsequent emergency landing and collision with a tree.

The pilot’s loss of directional control during the takeoff roll due to distraction by the passenger window being unsecured, which resulted in a runway excursion and impact with a runway distance marker. Contributing to the accident was pilot’s failure to ensure that the passenger window was secured.

The pilot’s failure to maintain adequate spacing from the lead airplane while landing following revised landing instructions, which necessitated that the pilot conduct an improper landing flare and resulted in a hard landing.

The pilot’s improper decision to operate the airplane in exceedance of the airplane manufacturer’s operating limitations, which led to an aerodynamic stall. Contributing to the accident was the pilot’s improper decision to continue attempting the takeoff after two failed attempts.

The pilot’s improper fuel planning and decision to not divert to a closer airport when the planned flight profile changed, which resulted in a total loss of engine power due to fuel exhaustion.

The pilot’s inadvertent reduction of power during the initial climb, which resulted in an aerodynamic stall. Contributing to the pilot’s inadvertent reduction of power was his lack of experience with his left hand on the control stick and right hand on the throttle.

The pilot’s failure to maintain a proper glidepath during a night landing, which resulted in impact with a tree.

The pilot receiving instruction’s failure to extend the landing gear and the flight instructor’s failure to verify that the landing gear was extended due to distraction, which resulted in a gear-up landing.