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Denver TRACON controllers reported an near midair collision with an IFR and VFR aircraft due to center's lack of separation.
| Attributes | |
| ACN | 1607014 |
| Time | |
| Date | 201901 |
| Local Time Of Day | 0601-1200 |
| Place | |
| Locale Reference | D01.TRACON |
| State Reference | CO |
| Aircraft 1 | |
| Make Model Name | Light Transport Low Wing 2 Turboprop Eng |
| Flight Phase | Descent |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Flight Phase | Cruise |
| Route In Use | None |
| Flight Plan | VFR |
| Person 1 | |
| Function | Approach |
| Qualification | Air Traffic Control Fully Certified |
| Experience | Air Traffic Control Time Certified In Pos 1 (yrs) 2 |
| Person 2 | |
| Function | Approach |
| Qualification | Air Traffic Control Fully Certified |
| Experience | Air Traffic Control Time Certified In Pos 1 (yrs) 7.5 |
| Events | |
| Anomaly | ATC Issue All Types Conflict NMAC |
Narrative:
Aircraft X was handed off to feeder I from ZDV sector 26 inbound to apa. Feeder I handed aircraft X off to me and I took the hand off when aircraft X was descending out of FL200 about 15 miles south south west of larks. I noticed a VFR target that was westbound at 175 and assumed that aircraft X was descending to FL180. The confliction was going to occur inside ZDV sector 26 airspace. When I observed aircraft X continue to descend out of FL180 I ran over to the feeder I position and asked if they were talking to aircraft X. The controller responded yes; and I told the controller to issue a traffic alert to aircraft X on the VFR at 175. Aircraft X told the feeder I controller that if action wasn't taken; then they would have hit the VFR aircraft and they had to take evasive action to avoid the mid-air.ZDV sector 26 should not have allowed aircraft X to descend into the VFR traffic. They did not absolve all conflictions prior to switching communications.
Original NASA ASRS Text
Title: Denver TRACON Controllers reported an NMAC with an IFR and VFR aircraft due to Center's lack of separation.
Narrative: Aircraft X was handed off to Feeder I from ZDV Sector 26 inbound to APA. Feeder I handed Aircraft X off to me and I took the hand off when Aircraft X was descending out of FL200 about 15 miles south south west of LARKS. I noticed a VFR target that was westbound at 175 and assumed that Aircraft X was descending to FL180. The confliction was going to occur inside ZDV Sector 26 airspace. When I observed Aircraft X continue to descend out of FL180 I ran over to the Feeder I position and asked if they were talking to Aircraft X. The controller responded yes; and I told the controller to issue a traffic alert to Aircraft X on the VFR at 175. Aircraft X told the Feeder I controller that if action wasn't taken; then they would have hit the VFR aircraft and they had to take evasive action to avoid the mid-air.ZDV Sector 26 should not have allowed Aircraft X to descend into the VFR traffic. They did not absolve all conflictions prior to switching communications.
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.