Accident Overview
A pilot, under the supervision of his employer/instructor, was practicing solo take-offs and landings to qualify for a float endorsement. During a take-off attempt from a river, the aircraft began to porpoise. It momentarily cleared the water with the left float, then the right float, swerved left, and struck the river bank in a level attitude. The aircraft rolled and came to rest partially submerged on its left side. A fire started in the engine compartment but lasted only a short time. The seriously injured pilot was rescued by the aircraft owner, who swam across the river.
Investigation Findings
The pilot, though experienced in wheel-equipped aircraft, had limited experience with floats. His solo flying time on float-equipped aircraft was less than one hour, all from the same location the day before the accident. The river flowed at approximately five knots in the take-off direction. The water level was low, exposing sand bars above and just below the surface. As a result, the average usable width of the river for take-offs and landings was less than 100 feet. The river had a prominent bend where the aircraft commenced its take-off and another just downstream of the occurrence site. The left riverbank, in the direction of take-off, was lined with tall trees up to the water's edge.
Restraint System and Injuries
The pilot's lap belt had a sliding friction-type buckle that loosened during the crash, and there was no shoulder harness installed. The source notes that the pilot would likely have suffered less serious injuries with a better restraint system.
Contributing Factors Identified
Although the pilot had successfully taken off and landed on the river the day before, the conditions were unsuitable for his limited float-flying experience. When directional control could not be established during the take-off, a prudent decision would have been to abort rather than continue. The supervising pilot should have recognized that the river conditions were unsuitable as a practice area for any pilot, particularly one with limited float experience.