What happened
On July 16, 2007, an Avions Pierre Robin DR 400-180R departed from the Vogtareuth landing field for a recreational flight with two passengers. The pilot had previously completed two glider tow operations using the same aircraft earlier that day. Approximately four minutes after takeoff, witnesses observed the aircraft performing unusual, acrobatic maneuvers, including steep spirals. During the final maneuver, the aircraft climbed steeply before banking sharply to the left. The aircraft then entered a spin, striking a cornfield with a high longitudinal pitch, leading with the left wing.
The investigation
The BFU investigation focused on the aircraft's condition, the pilot's medical and legal status, and the sequence of the flight maneuvers. Investigators found no evidence of mechanical failure or control malfunctions, and the aircraft's center of gravity was within limits. The investigation also examined the pilot's medical findings, noting a significantly enlarged heart (675 g) discovered during autopsy, which presented a risk of sudden cardiac impairment or loss of consciousness. Additionally, it was established that the pilot's private pilot license and medical certificate had expired approximately 12 months prior to the accident.
Findings
- The aircraft entered a stall at the apex of a maneuver, likely a lazy-eight, which led to a left wing drop and a subsequent spin.
- The low altitude at the time of the stall prevented the pilot from recovering the aircraft.
- The pilot's medical condition, specifically a highly enlarged heart, presented a potential risk of sudden impairment, though a direct link to the accident could not be confirmed.
- The accident was caused by the aircraft flying below its minimum airspeed.
- The pilot was operating with expired flight credentials and medical certification.