What happened
According to the pilot's account, he had previously landed on the airstrip approximately 30 minutes before the accident occurred. At that time, he inspected the runway and found no abnormalities regarding its condition. After completing his prior operations, he loaded 1,300 pounds of chemicals onto the aircraft. He then initiated a takeoff roll from the west end of the strip. Approximately 400 feet into the takeoff run, the main gear wheels bogged down in mud. This caused the nose to veer slightly to the left as the airplane tipped up on its nose and flipped forward into an inverted position.
The investigation
No mechanical examination or further investigative findings are provided in the source text. The narrative relies solely on the pilot's description of the event sequence.
Findings
The primary factor contributing to the accident was the soft, muddy condition of the airstrip surface. Despite the pilot's earlier assessment that the runway appeared normal 30 minutes prior, the ground conditions had changed sufficiently to cause the main landing gear to sink during the high-power takeoff roll. The weight of the 1,300 pounds of chemicals likely contributed to the load on the landing gear, exacerbating the effect of the soft surface.
Safety message
Runway condition assessments can change rapidly due to weather or usage. Pilots should re-evaluate surface conditions immediately before takeoff, especially when carrying heavy loads that increase ground pressure on the landing gear.