What happened
In the early morning hours of June 1, 2003, a GTE Kiss 13 ultralight, identified as 68ADW, was conducting a local flight near the Coulommiers aerodrome. Following a social event at a local flying club, the pilot decided to take a flight at approximately 04:30. A second pilot, acting as a passenger, joined the flight.
After taking off at 05:10, the aircraft reached an altitude of approximately 150 meters. During the flight, the pilot allowed the passenger to take control of the aircraft's control bar. While the passenger managed the flight surfaces, the pilot controlled the throttle using a foot-operated lever. As the aircraft approached the runway for a low-altitude pass, the passenger requested an increase in power. While the passenger maintained control of the bar, the aircraft entered a steep left turn without gaining sufficient altitude, leading to a violent impact with the ground.
The investigation
The investigation focused on the flight dynamics and the division of responsibilities between the crew. Investigators established that the pilot and passenger had both been awake throughout the night prior to the flight, though the pilot believed he was fit to fly.
Technical inspections of the GTE Kiss 13 revealed no mechanical anomalies, and the engine was producing power at the moment of impact. The investigation also noted that the aerodrome lacked any lighting aids for landing. Blood tests performed on both occupants following the accident showed no substances that would have impaired their ability to fly. It was also noted that the passenger was not wearing a protective helmet due to discomfort.
Findings
- The primary cause of the accident was the improper and improvised distribution of flight controls between the pilot and the passenger.
- The decision to conduct the flight under inappropriate conditions contributed to the loss of control.
- The crew's lack of sleep following an all-night period was a contributing factor to the decision-making process.