The pilot's failure to remove the flight control gust lock before takeoff, which resulted in an inability to rotate, aborted takeoff, and subsequent runway overrun. Contributing to the accident was a missing piece of the flight control gust lock, which did not give the pilot the intended warning that the gust lock was engaged.

The pilot’s inadvertent retraction of the landing gear during landing rollout, resulting in a landing gear collapse.

The pilot's VFR flight into instrument meteorological conditions and his ensuing failure to maintain altitude/clearance resulting in an in-flight collision with the ocean. A factor was the fog.