What happened
The incident occurred during nighttime operations when a tug driver operating a baggage cart failed to yield to an aircraft that was actively taxiing. The vehicle crossed an active taxiway while the aircraft was in motion. Visibility conditions were dark, but the aircraft had its position and taxi lights illuminated, making it visible to ground personnel. A stop sign designated for vehicles approaching the taxi centerline was located 70 feet from the point of interaction. The tug driver stated that he had stopped at the designated sign before proceeding.
Despite the vehicle's stop, the tug struck the right wingtip of the aircraft. The impact caused significant structural damage, including the rupture of a fuel tank within the wing. Additionally, the collision separated one propeller blade from the right propeller hub. The force of the impact pushed the aircraft approximately four feet sideways from its original taxi path.
The investigation
Investigation into the mechanical effects of the collision confirmed that the primary damage was localized to the right wing area. The rupture of the fuel tank indicated a breach in the wing's integrity, posing an immediate fire hazard and requiring extensive repair. The separation of the propeller blade suggested a high-energy impact sufficient to overcome the hub's retention mechanisms.
Findings
The investigation highlighted several contributing factors related to ground operations and visibility. The failure of the tug driver to yield right-of-way was a critical element, despite the presence of a stop sign. The dark nighttime conditions increased the difficulty of judging distance and speed for both the vehicle operator and the flight crew. The proximity of the stop sign to the taxi centerline may have influenced the driver's perception of safety when crossing.
Safety message
Ground vehicles must strictly adhere to right-of-way rules when crossing active taxiways, regardless of lighting conditions. Pilots should remain vigilant for ground traffic, especially at night, even when aircraft lights are visible. Clear communication between ground control and vehicle operators is essential to prevent similar collisions.