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ZDV controller reported both aircraft responded to RA when standard separation was applied; resulting in an airborne conflict.
| Attributes | |
| ACN | 1683003 |
| Time | |
| Date | 201909 |
| Local Time Of Day | 0601-1200 |
| Place | |
| Locale Reference | ZDC.ARTCC |
| State Reference | VA |
| Aircraft 1 | |
| Make Model Name | A320 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Descent |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Cessna Citation Sovereign (C680) |
| Operating Under FAR Part | Part 135 |
| Flight Phase | Climb |
| Flight Plan | IFR |
| Person 1 | |
| Function | Enroute |
| Qualification | Air Traffic Control Fully Certified |
| Experience | Air Traffic Control Time Certified In Pos 1 (yrs) 6 |
| Events | |
| Anomaly | ATC Issue All Types Conflict Airborne Conflict Deviation - Altitude Excursion From Assigned Altitude Deviation - Procedural Clearance |
Narrative:
I was training a radar control developmental on R35. Aircraft X was climbing to FL320 at a good rate. Aircraft Y was descending to FL330 per the LOA. Traffic was called to aircraft X and was acknowledged by the pilot. Traffic was called to aircraft Y with no reply. We then cleared military aircraft into a refueling track. We then noticed aircraft Y at FL335. We asked if he level at FL330; he replied that he was responding to a RA. Aircraft X also said they were responding to an RA. When aircraft Y climbed they got close to aircraft Z who also responded to a RA. It's my experience that traffic calls are not always acknowledged by pilots. However I think if aircraft Y had had gotten the traffic call this scenario could have been avoided. Given the climb rate of aircraft X; we could have restated the traffic.
Original NASA ASRS Text
Title: ZDV Controller reported both aircraft responded to RA when standard separation was applied; resulting in an airborne conflict.
Narrative: I was training a Radar Control Developmental on R35. Aircraft X was climbing to FL320 at a good rate. Aircraft Y was descending to FL330 per the LOA. Traffic was called to Aircraft X and was acknowledged by the pilot. Traffic was called to Aircraft Y with no reply. We then cleared military aircraft into a refueling track. We then noticed Aircraft Y at FL335. We asked if he level at FL330; he replied that he was responding to a RA. Aircraft X also said they were responding to an RA. When Aircraft Y climbed they got close to Aircraft Z who also responded to a RA. It's my experience that traffic calls are not always acknowledged by pilots. However I think if Aircraft Y had had gotten the traffic call this scenario could have been avoided. Given the climb rate of Aircraft X; we could have restated the traffic.
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.