What happened
On 4 October 2006, an Autogyro Europe GMBH MT03 gyroplane, registration ZU-EEP, was conducting a private flight from Lydenburg Aerodrome toward Graskop Aerodrome. While traversing a mountain range approximately 21.5 km from Graskop, the pilot attempted to navigate through a valley situated between two peaks. During this maneuver, the aircraft encountered a significant downdraft that forced the gyroplane downward into a gorge.
As the terrain rose sharply, the pilot attempted a maximum rate of climb to avoid the gorge floor. However, the aircraft entered a flight regime beyond its maximum power curve, resulting in a critical loss of airspeed and altitude. Faced with the inability to clear the rising terrain or return to the previous position, the pilot opted to perform an emergency landing on the mountainside. The impact with the rough terrain resulted in a hard landing, causing damage to the fuselage, the nose landing gear, the propeller, and the tail, as well as contact between the main rotor and the mountainside. There were no fatalities and no injuries reported during the incident.
The investigation
The investigation examined the aircraft's maintenance history and the pilot's experience. At the time of the accident, the aircraft had a total of 104 airframe hours. The most recent annual inspection had been completed on 15 June 2006, and the aircraft held a valid Authority to Fly. The inspection was performed by a properly rated professional, and no applicable airworthiness directives or service bulletins were outstanding. The investigation also reviewed the meteorological conditions, which were noted as having good visibility and light winds at the time of the occurrence.
Findings
- The primary cause of the accident was the encounter with a strong downdraft while attempting to cross a mountain range.
- The pilot's limited flying experience, with only 55.1 hours on this specific type, contributed to the situation, as the circumstances required advanced mountain flying techniques and proactive flight planning.