What happened
On July 30, 2021, an Ekolot JK 05 microlight, registration 71LO, was performing aerodrome circuits at Vesoul-Frotey. The aircraft was operated by a student pilot who did not hold a microlight license, accompanied by a passenger who held a microlight pilot license but lacked an instructor rating.
Following a touch-and-go landing, the aircraft entered its initial climb. During this phase, an occupant reported a technical issue via radio, and the pilot decided to execute a 18/0-degree turn to land on the reciprocal runway heading. An instructor pilot flying a nearby aircraft witnessed the Ekolot JK 05 at an altitude of approximately 200 feet. The witness observed the microlight bank to the left before suddenly rolling further and pitching nose-down. The aircraft subsequently collided with the ground approximately 30 meters to the right of the end of runway 08. The impact resulted in two fatalities and the destruction of the microlight.
The investigation
Investigators examined the wreckage and found the airframe had struck the ground with high energy in a near-vertical, nose-down attitude. The airframe parachute had not been deployed.
Technical analysis of the engine and fuel system revealed no mechanical obstructions or contamination. While the electric fuel pump switch was found in the 'off' position, the engine was capable of receiving fuel via gravity from the rear-mounted tanks. The investigators also noted that the aircraft had taken off on a runway with a 1.5% upward gradient.
Findings
- The primary cause of the accident was a loss of control during a turn-around maneuver following an engine power reduction.
- The decision to perform a 180-degree turn at a low altitude was a significant contributing factor, as such maneuvers significantly increase stall speed.
- A potential reduction in engine power may have been caused by the pilot failing to activate the electric fuel pump, combined with low fuel levels and the aircraft's pitch attitude during climb.
- The occupants lacked familiarity with local emergency landing procedures, as they had not yet integrated with the local aero club's instructional guidance regarding suitable landing areas for engine issues.