the fact that the ground radar was out of service on the day of the incident was one such root cause, as it would otherwise have been able to detect the presence of the skywest aircraft on the runway in time to alert the incoming us airways flight. other decisive factors were the lack of synchronicity between the flight progress tabs available to the controllers and the actual position of the aircraft on the airport runways and taxiways, which made the flight aircraft 5569 received incorrect instructions due to its controller's incorrect perception of its location. the poor night lighting of the runways and the glare problems that this lighting caused in the operators of the airport control tower, reducing their ability to see small aircraft during their maneuvers on the taxiways, was another of the determining factors of the sinister.