What happened
The pilot was engaged in agricultural aerial application activities, specifically treating a wheat field with chemicals. After completing an initial pass, the pilot executed a turn-around maneuver directed downwind to initiate another swath run. During this phase of flight, the pilot reported entering a settling-with-power condition. This aerodynamic state persisted and continued to affect the aircraft's descent rate as it approached the ground.
As the helicopter descended, the tall wheat stalks in the field wrapped around the spray booms attached to the aircraft. The entanglement of the vegetation caused the helicopter to roll over upon impact with the ground.
The investigation
The investigation focused on the mechanical condition of the helicopter and the circumstances surrounding the accident. Evidence indicated that the tall wheat crop played a significant role in the final moments of the flight. The vegetation wrapped around the spray booms, which contributed to the loss of control and the subsequent rollover.
Findings
The primary factor identified was the pilot's entry into a settling-with-power condition during the low-altitude maneuvering phase. This condition, combined with the environmental obstacle of the tall wheat field, led to the accident. The entanglement of the spray booms in the crop prevented recovery and resulted in the aircraft rolling over.
Safety message
Pilots conducting agricultural operations should be aware of the risks associated with settling-with-power, particularly when maneuvering at low altitudes near obstacles such as tall crops. Proper energy management and awareness of ground effects are critical to preventing similar incidents.