What happened
On 17 July 2010, a Windlass Aquilla, registration ZU-DXW, departed Microland Flight Park for a local pleasure flight. Approximately one hour into the flight, the aircraft's engine unexpectedly ceased operation. The pilot attempted to locate a suitable site for an emergency landing; however, the terrain in the vicinity of the Bronkhorstspruit Dam was characterized by rocky and hilly ground, making a conventional forced landing impossible.
In response to the power loss, the pilot deployed the aircraft's ballistic parachute. While the parachute successfully carried the aircraft to the ground, the landing sequence resulted in no injuries to the pilot, but caused substantial damage to the aircraft's wing, radio panel, and nose gear.
The investigation
An investigation into the incident included a detailed strip-down analysis of the Rotax 582 engine. Investigators examined the wreckage and the engine components to determine the source of the sudden power loss. The examination focused on the internal mechanics of the cylinders to identify any signs of overheating or mechanical failure.
Findings
- The engine failure was caused by the seizure of the number two piston within the cylinder.
- The seizure was identified as a "cold seize," a phenomenon occurring when an engine is super-cooled—such as during a prolonged descent without power—and is subsequently subjected to full throttle before reaching adequate operating temperatures.
- The aircraft was properly maintained, and the pilot held a valid microlight license.
- Meteorological conditions at the time of the accident were favorable, with clear visibility and light winds, and were not a contributing factor to the event.