What happened
The aircraft was taxiing for takeoff when the pilot lost orientation regarding the taxiway layout. The pilot reported being unable to distinguish between the elevation differences of the two distinct surfaces at the junction point. Specifically, the aircraft collided with a ditch located where the construction of a new taxiway intersected with an existing section of old asphalt.
The investigation
The investigation focused on the physical conditions of the airport environment at the time of the incident. It was determined that the specific taxiway segment involved was not illuminated by any lighting systems. Furthermore, the dugout area adjacent to the ditch was neither barricaded nor marked with appropriate signage or visual cues to alert pilots to the hazard.
Findings
The primary contributing factors were the pilot's disorientation and the inadequate infrastructure. The lack of lighting on the taxiway prevented clear visibility of the path. Additionally, the absence of barricades and markings around the dugout area failed to warn the pilot of the elevation change and the presence of the ditch.
Safety message
Airports must ensure that taxiways under construction or with significant surface changes are clearly marked and lit. Unmarked excavations or elevation drops near active taxiways pose a severe risk if not properly barricaded.