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Pct TRACON controller reported a near midair collision from an aircraft they were no longer talking to.
| Attributes | |
| ACN | 1557319 |
| Time | |
| Date | 201807 |
| Local Time Of Day | 1801-2400 |
| Place | |
| Locale Reference | PCT.TRACON |
| State Reference | VA |
| Aircraft 1 | |
| Make Model Name | Small Aircraft High Wing 1 Eng Fixed Gear |
| Operating Under FAR Part | Part 91 |
| Flight Phase | Final Approach |
| Route In Use | None |
| Flight Plan | VFR |
| Aircraft 2 | |
| Make Model Name | Helicopter |
| Flight Phase | Cruise |
| Route In Use | None |
| Flight Plan | None |
| Person 1 | |
| Function | Approach |
| Qualification | Air Traffic Control Fully Certified |
| Experience | Air Traffic Control Time Certified In Pos 1 (yrs) 1 |
| Events | |
| Anomaly | Conflict NMAC Deviation - Procedural Published Material / Policy |
| Miss Distance | Vertical 200 |
Narrative:
Working sfra-south; security monitoring position. Had 3 aircraft landing vkx. Aircraft X was number 3 for the airport. Made traffic call for aircraft in front of aircraft X who reported traffic in sight. Also reported vkx in sight. Switched aircraft to advisory frequency. Aircraft Y was in comms with dca tower southbound; abeam of dca when I switched aircraft X to unicom. Aircraft X was short final to vkx when ca alert went off. Shortly after; aircraft X returned to my frequency and reported an near midair collision with aircraft Y who was still in comms with dca tower. I acknowledged the transmission and returned aircraft X to advisories. Aircraft Y contacted me about 5 miles later and I asked the pilot if he had received a traffic call from dca tower for the vkx arrivals. He said he did; and he had the traffic in sight and had been maintaining visual separation.I don't have any recommendations. The aircraft were more than 10 miles apart when I switched aircraft X to advisories. I wasn't talking to either aircraft at the time of the reported near midair collision. Aircraft Y had received traffic advisories and reported that he was maintaining visual separation.
Original NASA ASRS Text
Title: PCT TRACON Controller reported a NMAC from an aircraft they were no longer talking to.
Narrative: Working SFRA-S; security monitoring position. Had 3 aircraft landing VKX. Aircraft X was number 3 for the airport. Made traffic call for aircraft in front of Aircraft X who reported traffic in sight. Also reported VKX in sight. Switched aircraft to advisory frequency. Aircraft Y was in comms with DCA tower southbound; abeam of DCA when I switched Aircraft X to UNICOM. Aircraft X was short final to VKX when CA alert went off. Shortly after; Aircraft X returned to my frequency and reported an NMAC with Aircraft Y who was still in comms with DCA tower. I acknowledged the transmission and returned Aircraft X to advisories. Aircraft Y contacted me about 5 miles later and I asked the pilot if he had received a traffic call from DCA tower for the VKX arrivals. He said he did; and he had the traffic in sight and had been maintaining visual separation.I don't have any recommendations. The aircraft were more than 10 miles apart when I switched Aircraft X to advisories. I wasn't talking to either aircraft at the time of the reported NMAC. Aircraft Y had received traffic advisories and reported that he was maintaining visual separation.
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.