What happened
Prior to the accident, the pilot was instructed by an FAA flight service station specialist to stay away from the destination airport until a special visual flight rules clearance could be provided. At the time, the airport was experiencing instrument meteorological conditions characterized by rain, low clouds, and heavy southeasterly winds. Approximately eight minutes after the initial communication, the specialist attempted to relay the necessary clearance, but the pilot did not respond.
A witness located roughly 0.5 mile southeast of the crash site observed the aircraft flying at a very low altitude over the treetops. The observer noted intense weather, including gusty winds estimated between 30 and 40 knots. As the plane passed, it performed a sharp left turn, with the wings rocking heavily and the nose pitching vertically. While navigating the hilly, forested terrain, the aircraft rolled to the right, causing the right wing to strike a large tree and detach. The plane then descended into a stand of trees.
Other pilots operating in the vicinity reported experiencing significant turbulence and strong downdrafts during the same period.
Findings
An investigation of the aircraft revealed no evidence of mechanical failure prior to the impact. Because there were no mechanical deficiencies found, investigators concluded that the pilot likely encountered severe terrain-induced turbulence and downdrafts while flying at a low altitude. The flight path and the area near the accident site included several bodies of open and protected water that would have been viable landing options for the float-equipped aircraft.