Skyhawk 172/Cutlass 172
Air Traffic Control Fully Certified
Air Traffic Control Time Certified In Pos 1 (yrs) 26
Training / Qualification; Situational Awareness; Distraction; Confusion
ATC Issue All Types; Conflict Airborne Conflict; Conflict Ground Conflict; Less Severe; Deviation / Discrepancy - Procedural Clearance; Ground Incursion Runway
Air Traffic Control Issued New Clearance; Air Traffic Control Separated Traffic
ATC Equipment / Nav Facility / Buildings; Airport; Human Factors
Aircraft X was cleared to land on the left runway. Aircraft Y was cleared to land on the right runway. My trainee and I were scanning out the window for the aircraft; very difficult due to the scratched and dirty shades and the filthy windows. Also the radar does not differentiate which runway aircraft are lined up for. We saw Aircraft X over the numbers for the right runway in landing configuration. We were forced to send Aircraft Y around; so that we would not lose runway separation. No loss of separation occurred.Get new window sun screens they are badly scratched and dirty. Clean the filthy windows. Align the radar so that we can tell which runway aircraft are landing on; or add a screen we can enlarge the picture on so we can tell which runway aircraft are lined up for.
I was working ground control. I had Aircraft Z holding short of the runway at the departure end. I scanned the radar for traffic and the final approach corridor and saw no traffic. I asked the local controller to cross the runways. He said cross runways. I told Aircraft Z to cross the runway. As I was doing this; I rescanned and saw an aircraft touching down. Since I had not unkeyed the frequency; I immediately cancelled the crossing and told the pilot to hold short of the runway. The pilot stopped north of the hold short bars; saving an incident.
A Controller had two aircraft cleared to land on parallel runways. One aircraft was lined up with the wrong runway. Later; the same Controller was working Ground Control and received approval for an aircraft to cross the runways.