Accident
A float-equipped airplane on an on-demand charter flight was departing a remote lake for the return leg of a trip. The pilot, along with three passengers, initiated a high-speed step taxi at the northwest portion of the lake, executing a 225-degree left turn. Following the turn, the airplane continued its takeoff run on an easterly heading. The right fuel tank, which contained approximately 15 gallons of fuel, had been selected for takeoff.
Approximately 45 seconds after liftoff, the engine ceased operation. The pilot conducted an emergency landing in a nearby creek. During the landing, the airplane struck a gravel bar and nosed over.
Investigation
A post-accident examination of the airplane revealed no mechanical malfunctions. The engine was subsequently started and produced full power. According to the pilot's operating handbook, prolonged uncoordinated flight—such as slips or skids—with low fuel reserves could uncover the fuel tank outlets, leading to fuel starvation and engine stoppage. The step taxi turn was described as a prolonged wings-level turn.
Findings
The aircraft's fuel system was functional, and the failure was not attributed to a mechanical defect. The circumstances of the takeoff, including the extended turning maneuver and low fuel quantity in the selected tank, were consistent with conditions that might induce fuel starvation as outlined in the flight manual.