What happened
The pilot was conducting a crop spraying operation, utilizing a highway as a makeshift runway for takeoff toward the north. The aircraft was heavily loaded with 720 pounds of chemical agent and 36 gallons of fuel. Although the pilot initially perceived only a light breeze from the south, he chose a northerly departure due to a hill obstructing the southern path. After rotating approximately 1500 feet into the air, the aircraft was still low enough that vehicular traffic on the highway remained visible below.
To avoid flying directly over the vehicles, the pilot initiated a left turn toward a wheat field bordered by trees ranging from 20 to 30 feet in height. During this maneuver, he realized the aircraft was not maintaining altitude. In an effort to clear the tree line, he deployed the flaps to 20 degrees and jettisoned the chemical load. As the turn continued, the left wing struck the ground, causing the aircraft to cartwheel before coming to a stop in an upright position.
The investigation
Post-accident analysis revealed that the southerly wind had increased to approximately 10 miles per hour at the time of the incident. Calculations indicated the aircraft's weight at the moment of the accident was approximately 2229 pounds. This figure significantly exceeded the maximum gross weight for takeoff, which is listed as 2070 pounds in the aircraft log.
Findings
The primary factors contributing to this accident were the excessive weight of the aircraft at takeoff and the resulting inability to maintain altitude during a low-level maneuver. The pilot's decision to turn over obstacles while already struggling for height, combined with the fuel exhaustion risk implied by the heavy load, led to the loss of control and subsequent ground contact.
Safety message
Pilots must strictly adhere to maximum gross weight limitations for takeoff, especially during crop dusting operations where chemical loads can drastically increase aircraft mass. Overloading an aircraft compromises its performance capabilities, particularly during critical phases like takeoff and low-altitude maneuvering.