What happened
On 10 October 2024, a pilot was conducting a private local flight departing from a farm airstrip in Vrede, Free State. The flight, operated under Part 94 regulations, was intended to be a short circuit returning to the same gravel runway. Weather conditions were generally favorable, with clear visibility and light winds.
As the pilot approached the runway for landing, he performed an unmanned runway inspection. During the landing phase, the aircraft, a Sling 4 High Wing with registration ZU-KFJ, encountered a whirlwind originating from the right side of the aircraft. This sudden atmospheric disturbance caused the plane to bounce upon touchdown. Following the bounce, the pilot lost directional control, and the aircraft veered toward the left side of the runway. During this excursion, the nose landing gear struck an uneven section of the ground and collapsed. This impact triggered a nose-over maneuver, leaving the aircraft resting in an inverted position. The pilot sustained serious back injuries during the event, though he was able to exit the wreckage without assistance.
The investigation
SACAA AIID examined the circumstances surrounding the landing and the condition of the aircraft and airfield. The investigation confirmed that the Sling 4 High Wing was airworthy, with a valid authority-to-fly and recent maintenance completed. The pilot held a valid Private Pilot Licence and a current medical certificate. The investigation also reviewed the runway surface, noting the presence of uneven terrain that contributed to the gear failure once the aircraft had left the main runway surface.