Engine Sputters Leading to Forced Landing on Lake (N615T)

Accident Sequence

While maneuvering above a lake, the pilot initiated a right turn. During the turn, the airplane's engine "sputtered." The pilot leveled the airplane and applied full power, after which the engine "came back" and sounded normal. The pilot then switched fuel tanks. Believing everything "seemed ok," he completed the right turn and leveled the airplane. Shortly thereafter, the engine sputtered again and lost power. The pilot performed a forced landing to the lake. He was able to egress the airplane prior to it sinking.

Recovery and Investigation

The airplane and engine were recovered from the lake and retained for further investigation. Approximately 50 gallons of fuel were drained from the main tanks, and the wing tip tanks were empty. The engine was examined, and no pre-impact mechanical anomalies were noted. The airplane was last refueled about four months prior to the accident and had not flown for approximately two months prior to the accident.