What happened
During a flight operating under Title 14, CFR Part 91, a float-equipped aircraft was departing northward from a narrow stream. The flight was carrying several lodge guests. At the time of the accident, local weather reports indicated northerly winds ranging from 25 to 35 knots. According to the passengers, the aircraft began its takeoff roll directly into these strong headwinds.
Shortly after the aircraft became airborne, the pilot initiated a sharp left-hand turn at an altitude of approximately 150 feet. During this maneuver, the aircraft began to buffet and vibrate significantly. The pilot reported that a powerful downdraft forced the plane toward the ground. The aircraft subsequently descended in a nose-low attitude into the marshy terrain.
Upon impact, the right wing of the aircraft collapsed, and the fuselage settled on its right side. One passenger, located near the right main cabin door, was partially ejected from the aircraft and became trapped under the fuselage and submerged in water. Despite rescue attempts by the pilot and the remaining passengers, the individual could not be recovered.
Findings
An investigation of the wreckage by the NTSB found no evidence of mechanical issues prior to the accident. The pilot also stated that no mechanical anomalies had been observed during the flight. The primary factor in the crash was a strong downdraft encountered during a steep turn.