Accident to the microlight fixed-wing Aéroservices Guepy 582 identified 25AAG on 28/05/2024 at Thise

The pilot was carrying out his first flight after a long period of inactivity lasting more than a year, during which he had carried out various maintenance tasks on his microlight. Before the flight, on the parking, the pilot carried out an engine ground-run during which, according to witnesses, he ran the engine up to moderate power.

The bore of the front carburettor had a slight irregularity. When power was applied for take-off, the front carburettor throttle slide may have become blocked in the up position (full throttle position). When the pilot reduced power in climb, the difference in position between the throttle slides may have caused the two carburettors to desynchronize. The imbalance between the thrust developed by each of the two pistons may have led to strong vibrations, engine speed variations, and a decrease in engine power. Witnesses on the ground did indeed perceive significant engine speed variations during the flight.

The investigation was unable to explain the flight path followed by the pilot.

The pilot found himself overhead a row of trees and an upward sloping field, before the town of Thise. He lost control of the microlight as he began a turn at low height.