What happened
On 3 November 1999, a Piper PA-23-250, registration G-KEYS, was preparing for a private flight from Glasgow Airport to Londonderry Eglinton. During the taxi phase, the aircraft moved along taxiway 'A' toward the intersection with taxiway 'B'. After receiving takeoff clearance for Runway 23 from the 'B' intersection, the pilot proceeded toward the runway in dark conditions.
As the aircraft approached the intersection, the left propeller struck an unlit, temporary edge light unit positioned on the left side of the 'B' intersection. While the pilot did not notice any engine vibration at full power and proceeded with the flight, the damage to the propeller tips was identified upon arrival at the destination. The aircraft was subsequently moved to a repair facility the following day.
The investigation
The investigation focused on the circumstances surrounding the contact with the light unit. It was established that the airfield was undergoing night-time maintenance, and NOTAMs had been issued regarding works in progress on the runway. While the full 23-metre width of the taxiway was available and marked with green centreline lights, one temporary light unit had been damaged by the aircraft.
Findings
- The pilot's perception of approaching traffic was influenced by the landing lights of other aircraft, which appeared closer than their actual position.
- The pilot experienced a self-induced sense of urgency to enter the runway and take off.
- The left propeller struck an unlit temporary edge light unit during the taxi.
- The pilot could have utilized the aircraft's own landing lights more effectively to identify obstacles.
- There were no injuries to the crew or the two passengers on board.