What happened
The accident occurred during a landing attempt on a sandbar that the pilot had successfully used three times earlier in the same day. The pilot reported that he overran the intended landing area by approximately 50 feet. Upon reaching this overrun zone, the aircraft encountered an area of soft clay and mud rather than firm ground. As a result, the right main wheel sank into the mud, causing the aircraft to roll onto its back.
Findings
The primary factor in the accident was the soft clay and mud conditions on the sandbar, which were not present or noted during the earlier landings. The pilot had previously used this specific location for landing without incident, suggesting a change in surface conditions or an unexpected variation in the terrain composition at that moment. The wind was reported as light and variable, indicating that weather conditions did not contribute to the overrun.
Safety message
Pilots should remain vigilant regarding surface conditions on unimproved landing sites, even if they have been used successfully previously. Sandbars and similar natural landing areas can change significantly due to water levels, sediment deposition, or erosion, creating hidden hazards like soft mud that may not be visible from the air.