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B757 first officer reported his aircraft as well as others on approach to ord received TCAS ras for traffic which was not reported by ATC.
| Attributes | |
| ACN | 1489775 |
| Time | |
| Date | 201710 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | ORD.Airport |
| State Reference | IL |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | B757 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Descent |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Person 1 | |
| Function | Pilot Flying First Officer |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Total 13167 Flight Crew Type 10234 |
| Events | |
| Anomaly | ATC Issue All Types Conflict Airborne Conflict |
Narrative:
Normal flight until descent on arrival passing approximately 9;200 for 9;000 feet. TCAS RA followed by TCAS avoidance maneuver. Transmitted event to ATC. Controller stated that it was at 8;500 feet and nothing else concerning the threat aircraft. Received a level off TCAS and we did so at around 9;300-9;400 feet. TCAS clear-of-conflict then descended to previously cleared altitude. We heard 2 or 3 other aircraft execute TCAS maneuvers during the time on the approach frequency. The controller never warned any of the descending aircraft of the traffic conflict.
Original NASA ASRS Text
Title: B757 First Officer reported his aircraft as well as others on approach to ORD received TCAS RAs for traffic which was not reported by ATC.
Narrative: Normal flight until descent on arrival passing approximately 9;200 for 9;000 feet. TCAS RA followed by TCAS avoidance maneuver. Transmitted event to ATC. Controller stated that it was at 8;500 feet and nothing else concerning the threat aircraft. Received a level off TCAS and we did so at around 9;300-9;400 feet. TCAS clear-of-conflict then descended to previously cleared altitude. We heard 2 or 3 other aircraft execute TCAS maneuvers during the time on the approach frequency. The Controller never warned any of the descending aircraft of the traffic conflict.
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.