What happened
On Monday, October 7, 2002, a SG Aviation Storm 300 microlight, identified as 71-HA, was conducting a local flight from Biscarrosse to the Fourques ULM platform. Upon arriving vertically above the airfield, the pilot performed standard integration procedures. During this approach, the pilot observed a flatbed truck and a tractor parked on the final third of unpaved runway 11.
Choosing to perform a low-altitude pass, the pilot did not perceive any significant activity on or near the runway. The pilot proceeded to land on runway 11 in a tailwind configuration. After approximately 100 meters of ground roll, the tractor, which had been obscured by the truck, began moving toward the runway centerline. The pilot was unable to avoid the vehicle, and the left wingtip struck the tractor. The impact deflected the aircraft to the right toward several hangars. The pilot applied full power to regain control and avoid the buildings, but the aircraft eventually veered off the runway and came to rest in a cornfield. There were no fatalities or injuries reported.
The investigation
The investigation examined the movements of both the aircraft and the ground vehicles, as well as the visibility and auditory conditions at the time of the accident. The tractor driver stated that because the hangar doors were closed, he assumed no flight operations were underway. He further noted that the noise from the tractor's engine masked the sound of the approaching microlight. Additionally, the driver was preoccupied with adjusting the grass-cutting equipment, which prevented him from noticing the aircraft.
Findings
- The pilot made the decision to land on a runway that was occupied by maintenance vehicles.
- There was a lack of proper organization regarding the mowing operations on the airfield.
- The tractor driver's attention was diverted by mechanical adjustments to the mowing equipment.
- The engine noise from the tractor prevented the driver from hearing the approaching aircraft.