What happened
On 06 March 2010, a Windlass Aquilla microlight, registration ZU-EPF, was conducting a private day flight under visual flight rules from Microland Flight Park Airfield. While returning to the airfield, the pilot heard a dull thud and felt the control bar move, leading to concerns regarding a potential structural failure. To avoid further stress on the airframe, the pilot reduced engine power and prepared for a precautionary landing in an open field near Baps andfontein.
Although the initial touchdown in the grassland was uneventful, the aircraft's engine suddenly surged to full power during the landing roll. This unexpected acceleration directed the aircraft toward an adjacent maize field. To prevent entering the crop field, the pilot intentionally induced a ground loop. This maneuver caused the aircraft to roll onto its right side, resulting in substantial damage to the wing, propeller, and landing gear.
The investigation
SACAA AIID investigators examined the wreckage and the flight history of the aircraft. While the pilot initially believed a structural failure had occurred due to the noise heard in flight, the investigation found that the wing keel tube damage was actually caused by the ground impact forces during the rollover. The aircraft's maintenance records showed it had been properly maintained by an approved person and was airworthy at the time of the accident.
Findings
- The pilot and passenger sustained no injuries.
- The primary cause of the accident was the pilot-induced ground loop intended to avoid the maize field.
- A significant contributing factor was the sudden increase in engine power, which occurred when the passenger, following instructions to lift their feet for the landing, inadvertently applied the throttle.
- The aircraft sustained substantial structural damage, including a broken keel tube and propeller strike.