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A320 flight crew reported an near midair collision with a single engine light aircraft in the vicinity of den.
| Attributes | |
| ACN | 1587598 |
| Time | |
| Date | 201810 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | DEN.Airport |
| State Reference | CO |
| Environment | |
| Flight Conditions | VMC |
| Aircraft 1 | |
| Make Model Name | A320 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Descent |
| Route In Use | STAR FRNCH THREE |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Small Aircraft |
| Operating Under FAR Part | Part 91 |
| Person 1 | |
| Function | First Officer Pilot Not Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) Flight Crew Multiengine Flight Crew Instrument |
| Experience | Flight Crew Last 90 Days 150 Flight Crew Total 7800 Flight Crew Type 1639 |
| Person 2 | |
| Function | Captain Pilot Flying |
| Qualification | Flight Crew Instrument Flight Crew Air Transport Pilot (ATP) Flight Crew Multiengine |
| Experience | Flight Crew Last 90 Days 213 Flight Crew Total 10977 Flight Crew Type 10823 |
| Events | |
| Anomaly | Conflict NMAC |
Narrative:
Descending via frnch arrival STAR; ATC leveled us at FL190 then was stepping us down a few thousand feet at a time. In the vicinity of tomsn intersection at or near our assigned altitude of 15;000 feet we encountered a light aircraft between 300-500 feet above us traveling in the opposite direction. I was making a radio call to approach when I saw the aircraft and said 'aircraft' before releasing the microphone. Time from visually acquiring the aircraft to determining it wasn't going to impact us to having it pass was approximately 3-5 seconds. I then reported 'near midair collision' to ATC. ATC informed us of traffic at 13;000 feet which I saw below us. ATC then reported a VFR target squawking 1200 shortly after. The aircraft may have turned on their transponder after seeing an airbus nearly hit them.a few miles earlier I had noticed an unfilled white diamond symbol on my TCAS; however it was not in our flight path. We received no TCAS RA; traffic alert or any other guidance or warning.
Original NASA ASRS Text
Title: A320 flight crew reported an NMAC with a single engine light aircraft in the vicinity of DEN.
Narrative: Descending VIA FRNCH arrival STAR; ATC leveled us at FL190 then was stepping us down a few thousand feet at a time. In the vicinity of TOMSN intersection at or near our assigned altitude of 15;000 feet we encountered a light aircraft between 300-500 feet above us traveling in the opposite direction. I was making a radio call to Approach when I saw the aircraft and said 'AIRCRAFT' before releasing the microphone. Time from visually acquiring the aircraft to determining it wasn't going to impact us to having it pass was approximately 3-5 seconds. I then reported 'near midair collision' to ATC. ATC informed us of traffic at 13;000 feet which I saw below us. ATC then reported a VFR target squawking 1200 shortly after. The aircraft may have turned on their transponder after seeing an Airbus nearly hit them.A few miles earlier I had noticed an unfilled white diamond symbol on my TCAS; however it was not in our flight path. We received no TCAS RA; Traffic Alert or any other guidance or warning.
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.