What happened
On 30 November 2008, a private gyroplane flight departed from Vryheid Aerodrome in KwaZulu-Natal. During the flight, the Autogyro MT 03, registration ZU-ETR, struck high-tension power lines belonging to the Normandie/Umfulozi line between pylons 208 and 209. The impact occurred near the Sterkstroom farm.
The collision with the cables caused the aircraft's rotor blades to separate from the rotor head, leading to an immediate loss of control. The aircraft subsequently struck the ground approximately 75 meters east of the power lines. The impact was so severe that the engine, tail section, and a fuel tank were severed from the main wreckage. The pilot, who was the sole occupant, sustained fatal injuries.
The investigation
Investigators from the SACAA AIID examined the wreckage and the electrical infrastructure. An ESKOM cable inspection team, which had been dispatched to investigate a power fault, discovered the wreckage at the scene. The investigation confirmed that the aircraft's engine was operating normally at the time of the accident, evidenced by the high-velocity dispersal of propeller fragments.
Physical evidence on the rotor head showed distinct scuffing marks consistent with contact with a metal cable. The collision was powerful enough to sever one 38mm high-tension wire and cause extensive damage to a second. The investigation also noted that the pilot was wearing corrective lenses, as broken glasses were recovered from the site.
Findings
- The pilot was properly licensed and medically certified for the flight.
- The Autogyro MT 03 was properly maintained, with no evidence of mechanical or structural failure prior to the impact.
- The pilot was operating at a low altitude and failed to observe the high-tension power lines.
- The magnitude of the impact forces rendered the accident non-survivable, despite the pilot wearing a shoulder harness.
Safety action
Following the investigation, the following safety considerations were noted:
- The need for SACAA safety recommendations to minimize unnecessary low-level exposure to hazards like power lines.
- The development of operational guidance material for pilots performing low-level flights.
- The potential establishment of a national database to track the locations of known power lines and tall structures for pilot awareness.