Incident Overview
A single-engine aircraft experienced a loss of engine power at approximately 150 feet above ground level (AGL) during the initial climb after takeoff. The pilot subsequently ditched the aircraft in a lake located off the end of the runway.
Pre-Accident Operations
The aircraft was equipped with four fuel tanks that could be individually selected to supply fuel to the engine. On the morning of the accident, the pilot reported fueling all four tanks to capacity. The pilot then flew three unremarkable flights, which consumed about 50 percent of the total fuel. The pilot stated that the airplane and engine performed normally without any indication of developing problems.
Accident Flight
The pilot described the takeoff during which the accident occurred as routine. The engine was smooth and powerful, and all instruments were within their normal operating ranges. The fuel selector was positioned on the right tank, which contained approximately 17 gallons of fuel. At about 150 feet AGL, the pilot reduced propeller rpm. At that moment, the engine began "cutting out." It did not entirely quit. The pilot verified that the fuel boost pump was on and noted that the fuel pressure gauge and oil pressure gauge were in the green arc. He then changed fuel tanks but had no additional time to attempt an engine restart before ditching. The second pilot reported that he believed the engine "picked up" again just before the aircraft ditched in the lake.
Post-Accident Examination
After the aircraft was recovered from the lake, an examination of the airframe and engine failed to reveal any mechanical irregularity. The carburetor was lost in the lake during recovery and was not found.