What happened
On April 12, 2015, at approximately 7:37 p.m., a COSMOS microlight (identified as 55-KA) was conducting a local recreational flight departing from the Etain microlight airfield in France. The aircraft was occupied by the pilot and a passenger.
During the flight, the pilot performed tight maneuvers at a very low altitude to increase the sensation of flight. Witnesses on the ground observed the aircraft flying at low heights and noted fluctuations in the engine RPM. While the aircraft was flying at a low altitude, it struck an electrical power line, which caused a visible electric arc. Following the impact with the wires, the aircraft crashed into the ground. The accident resulted in the death of the pilot and serious injuries to the passenger, while the aircraft was destroyed.
The investigation
Investigators examined the aircraft and the flight conditions. The passenger noted that weather conditions were good and the aircraft appeared to be functioning normally. She stated that the low-altitude flight was intentional to enhance the experience and that the pilot had indicated an intention to cease aggressive maneuvers due to engine temperature readings. However, the aircraft continued to fly at a low altitude, and the collision occurred shortly after passing a vehicle on a road.
Technical inspections of the 55-KA revealed no pre-existing mechanical anomalies or damage; all structural deformations and breaks were found to be a direct result of the impact. Evidence of electrical arcing was found on the leading edge of the wing, confirming that the upper portion of the aircraft struck the power lines.
Findings
- The pilot failed to detect the power lines and was unable to take evasive action.
- The primary cause of the accident was the pilot's decision to fly at an extremely low altitude to seek high-sensation maneuvers.
- The flight altitude violated standard air rules, which generally prohibit VFR flights below 150 meters (500 ft) above the ground or obstacles, except during takeoff and landing.