What happened
On March 15, 2003, a Rans S-6S micro light aeroplane, registered PH-3P9, was conducting local flight operations and circuit training at Lelystad Airport. The aircraft was occupied by two individuals, including a pilot with significant flight experience acting as an instructor. Following a 40-minute local flight, the pilot attempted a series of go-around maneuvers.
During the first attempt, the aircraft maintained a stable approach with flaps set to 25 degrees and a speed of approximately 100 km/le. However, during the second approach, the aircraft was flown at a reduced speed of roughly 90 km/h. While at a low altitude over the runway, the aircraft suddenly rolled to the left. Upon impact with the ground, the left landing gear leg collapsed, followed immediately by the right leg, causing the aircraft to come to rest on its belly. There were no injuries to the occupants, though the aircraft sustained significant damage.
The investigation
The investigation focused on the flight parameters during the second approach and the aerodynamic behavior of the aircraft at low altitude. Investigators examined the wind conditions, which were reported as a direct headwind of approximately 10 knots, and determined that weather was not a contributing factor to the accident.
Findings
The primary cause of the accident was an insufficiently low airspeed during the final approach phase. This loss of speed resulted in an aerodynamic stall at a critical low altitude, triggering the sudden roll and subsequent structural failure of the landing gear upon ground contact.