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The flight crew of a 737 reported the need to comply with an RA to avoid an airborne conflict that ATC was seemingly unaware of.
| Attributes | |
| ACN | 1473273 |
| Time | |
| Date | 201708 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | ZZZ.ARTCC |
| State Reference | US |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | B737 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Initial Approach |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Person 1 | |
| Function | Pilot Not Flying First Officer |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Person 2 | |
| Function | Pilot Flying Captain |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Last 90 Days 366 Flight Crew Type 6525 |
| Events | |
| Anomaly | ATC Issue All Types Conflict Airborne Conflict |
Narrative:
Level at 16;000 ft just north of zzzzz intersection we observed traffic on TCAS below and to the left of our position; climbing at a high rate. ATC never informed us of any traffic in our vicinity. Within seconds; we received a resolution advisory to descend. The captain immediately started to comply with the TCAS resolution and started a descent until clear of conflict. I; as the pilot monitoring; tried to immediately notify ATC of the conflict; but I was unable to for about five to ten seconds due to radio congestion. As soon as possible; I notified center that we were descending to comply with TCAS resolution. It seemed that ATC was not even aware of the traffic in our vicinity otherwise he may have given us at least an indication that there was another aircraft climbing towards us. Center then asked us what kind of resolution it was and at what altitude we had descended to; to which I replied a descent resolution and 15;000 ft. We were then handed to approach and continued the visual approach without further incident.
Original NASA ASRS Text
Title: The flight crew of a 737 reported the need to comply with an RA to avoid an airborne conflict that ATC was seemingly unaware of.
Narrative: Level at 16;000 ft just north of ZZZZZ intersection we observed traffic on TCAS below and to the left of our position; climbing at a high rate. ATC never informed us of any traffic in our vicinity. Within seconds; we received a resolution advisory to descend. The Captain immediately started to comply with the TCAS resolution and started a descent until clear of conflict. I; as the Pilot Monitoring; tried to immediately notify ATC of the conflict; but I was unable to for about five to ten seconds due to radio congestion. As soon as possible; I notified Center that we were descending to comply with TCAS resolution. It seemed that ATC was not even aware of the traffic in our vicinity otherwise he may have given us at least an indication that there was another aircraft climbing towards us. Center then asked us what kind of resolution it was and at what altitude we had descended to; to which I replied a descent resolution and 15;000 ft. We were then handed to Approach and continued the visual approach without further incident.
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.