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Denver TRACON final controllers reported a loss of separation when the leading aircraft went through the other aircraft's final.
| Attributes | |
| ACN | 1419860 |
| Time | |
| Date | 201701 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | D01.TRACON |
| State Reference | CO |
| Environment | |
| Light | Dusk |
| Aircraft 1 | |
| Make Model Name | Medium Transport Low Wing 2 Turbojet Eng |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Final Approach |
| Route In Use | Visual Approach |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Medium Large Transport Low Wing 2 Turbojet Eng |
| Operating Under FAR Part | Part 129 |
| Flight Phase | Final Approach |
| Route In Use | Visual Approach |
| Flight Plan | IFR |
| Person 1 | |
| Function | Approach |
| Qualification | Air Traffic Control Fully Certified |
| Experience | Air Traffic Control Time Certified In Pos 1 (yrs) 1 |
| Person 2 | |
| Function | Approach |
| Qualification | Air Traffic Control Fully Certified |
| Experience | Air Traffic Control Time Certified In Pos 1 (yrs) 1 |
| Events | |
| Anomaly | ATC Issue All Types Conflict Airborne Conflict Deviation - Procedural Clearance Deviation - Track / Heading All Types |
Narrative:
I was relieving a controller at the final position and to my memory I believe I had plugged in to watch for a satisfactory amount of time in order to become comfortable with what was happening. During the briefing; aircraft X on a visual approach to 16R was eventually 600 ft below aircraft Y who was also on a visual approach; but to 16L. Aircraft Y went through his localizer but was already on tower frequency. When I assumed the position and noticed aircraft Y on the wrong localizer; I gave my brain a chance to assess the situation and I think I noticed the aircraft Y making a correction back to 16L. I didn't say anything to aircraft X because of the correction that aircraft Y was making back to the 16L localizer and after aircraft Y was no longer a factor for aircraft X; I shipped aircraft X to the tower.I think calling traffic 'again' would be good but I'm not sure that aircraft X would have been able to see him. Both aircraft were issued traffic prior to this happening and both reported the other in sight. The timing of this event was unfortunate because it happened during a relief briefing.
Original NASA ASRS Text
Title: Denver TRACON Final controllers reported a loss of separation when the leading aircraft went through the other aircraft's final.
Narrative: I was relieving a controller at the Final position and to my memory I believe I had plugged in to watch for a satisfactory amount of time in order to become comfortable with what was happening. During the briefing; Aircraft X on a visual approach to 16R was eventually 600 ft below Aircraft Y who was also on a visual approach; but to 16L. Aircraft Y went through his localizer but was already on tower frequency. When I assumed the position and noticed Aircraft Y on the wrong localizer; I gave my brain a chance to assess the situation and I think I noticed the Aircraft Y making a correction back to 16L. I didn't say anything to Aircraft X because of the correction that Aircraft Y was making back to the 16L localizer and after Aircraft Y was no longer a factor for Aircraft X; I shipped Aircraft X to the tower.I think calling traffic 'again' would be good but I'm not sure that Aircraft X would have been able to see him. Both aircraft were issued traffic prior to this happening and both reported the other in sight. The timing of this event was unfortunate because it happened during a relief briefing.
Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.