What happened
On 1 August 2001, a Cosmos Phase 2 microlight, unregistered French aircraft identified as '21SJ', was participating in a large-scale organized group flight involving over 100 ultralight aircraft. The flight was traveling from Old Sarum toward Headcorn Airfield in Kent.
While positioned on a left base leg approximately 3 km from the airfield, the aircraft's Rotax 582 engine ceased operation. The pilot attempted to execute a forced landing in an available field located into the wind; however, the chosen area was small and bordered by trees. Upon contact with the ground, the aircraft pitched over onto its back, resulting in extensive damage. Both the pilot and the passenger sustained minor injuries.
The investigation
The investigation was based on the aircraft accident report submitted by the pilot. It was established that the aircraft was operating under specific UK CAA exemptions for non-certificated foreign aircraft. At the time of the incident, the aircraft was carrying approximately 36 kg of fuel.
Investigators examined the circumstances leading to the engine failure and the pilot's ability to monitor fuel levels. The investigation noted that the aircraft's position and altitude at the moment of the failure left no margin for selecting a landing site clear of obstacles.