What happened
During a flight involving VH-YHS, a high-performance helicopter, the pilot initiated a takeoff sequence that deviated from standard procedures. Rather than allowing the aircraft to settle lightly on the skids and transitioning into a balanced hover, the pilot applied control inputs more aggressively than usual. This rapid lift-off caused an imbalance between the main rotor torque and the anti-torque provided by the Fenestron tail rotor.
As the aircraft left the ground, it experienced a significant yaw to the left. This rotation was potentially exacerbated by a light wind blowing from the right. The pilot attempted to recover using primarily cyclic control instead of the necessary full right pedal input. Realising the yaw rate could not be arrested, the pilot opted to land the aircraft. During the descent, the left skid made contact with the ground, causing the helicopter to roll over and the main rotor blades to strike the earth. The impact destroyed the aircraft, though the pilot sustained minor injury.
The investigation
Investigators examined the maintenance history and the aircraft's condition following the accident. The maintenance organisation found no evidence of airworthiness issues that could explain the loss of control. Furthermore, the investigation found that the aircraft was operating well below its maximum capacity with only three occupants. The pilot's account and manufacturer feedback indicated that neither mechanical failure nor the prevailing wind conditions were contributing factors to the incident.