Accident Overview
On Monday 2 July 2012 at approximately 19:50 local time, a Robin DR400 registered F-GSBA and operated by a local aero club collided with a mowing vehicle on runway 29 at Vitry-le-François aerodrome (Marne department, France). The vehicle driver was injured, and the aircraft sustained heavy damage. The right wing of the DR400 was torn off, and the vehicle overturned.
Circumstances
The pilot, who was based at the aerodrome, initially took off from runway 05 to perform aerodrome circuits. After two touch-and-go landings, he joined the downwind leg for runway 29 with the intention of executing a full-stop landing. Shortly after touchdown, the aircraft struck a mowing vehicle located approximately 200 meters from the runway threshold. The vehicle, weighing about 400 kilograms and painted orange, was hit from behind by the right wing. The driver was conducting mowing operations on the first 200 meters of runway 29 in preparation for an aeromodelling event scheduled for the following weekend.
The pilot reported seeing two club aircraft depart from runway 05 and therefore chose to use that runway for landing. He stated that he was unaware of any vehicle occupying the threshold of runway 29. He caught sight of the vehicle just before the collision and could not perform an evasive maneuver. He had consulted the briefing board and the applicable NOTAMs at the aero club, but the occupation of runway 29 was not mentioned there.
The vehicle driver explained that he had verbally informed the president of the aero club that he would be mowing the runway during the week, depending on weather. On the day of the accident, he informed the aerodrome operator and several club members present that he was about to begin mowing. He had no aviation experience and had never received safety instructions regarding runway occupation. He usually wore a fluorescent vest but had forgotten it that day. The vehicle was not marked or flagged in any way.
Aerodrome and Communication Information
Vitry-le-François aerodrome is open to public air traffic and is not reserved for radio-equipped aircraft. Vehicle access to the aerodrome is governed by a 1977 decree, which defines authorized persons and vehicles but does not detail specific circulation rules. A protocol existed between the northeastern air navigation services (SNA-NE) and the aerodrome operator, calling for coordination when disruptive activities limit the use of infrastructure. The aerodrome operator, seeing that the mowing was underway, assumed the activity had already been coordinated with the club and therefore did not inform the SNA. No NOTAM was issued to indicate the unavailability of runway 29.
Pilot Profile
The pilot, aged 62, held a private pilot license since 1993 and had accumulated approximately 375 flight hours. In 2012, he had logged about 20 hours, of which 7 were as pilot-in-command. He wore corrective lenses without sun protection. Weather conditions at the time were CAVOK with light winds. The sun was aligned with the runway (azimuth 289°) at an elevation of 12°. The pilot stated that the lighting conditions did not hinder his view during final approach.
Investigation Findings
The investigation concluded that the collision occurred because the pilot failed to detect the vehicle occupying the runway. Contributing factors included the absence of a NOTAM warning of the runway restriction, the lighting conditions, the pilot's possible focus on flight parameters during final approach at the expense of external vigilance, and the lack of vehicle markings. The 'see and avoid' principle proved ineffective in this event. Better coordination among the aerodrome operator, club, and air navigation services could have led to dissemination of the runway occupation information through NOTAMs or ground signals.