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Air carrier first officer reported receiving conflicting information from ATC and automation when dealing with a traffic conflict.
| Attributes | |
| ACN | 1514448 |
| Time | |
| Date | 201801 |
| Local Time Of Day | 0601-1200 |
| Place | |
| Locale Reference | SJC.Airport |
| State Reference | CA |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | EMB ERJ 170/175 ER/LR |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Initial Approach |
| Route In Use | Direct STAR RAZRR4 |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Person 1 | |
| Function | First Officer |
| Qualification | Flight Crew Multiengine Flight Crew Instrument Flight Crew Air Transport Pilot (ATP) |
| Events | |
| Anomaly | ATC Issue All Types Conflict NMAC Deviation - Altitude Excursion From Assigned Altitude |
Narrative:
We were [a] flight from to sjc when we responded to an RA. During descent on the razrr 4 RNAV arrival we were passing through about 9000 ft we were given a turn to the south (perhaps about a 220 heading). We were given clearance to descent to 8000 ft. Then we were given direct to klide and an altitude of 6000 ft. Shortly after; ATC called out traffic at 11 o'clock and 5 miles. We were unable to visually locate traffic although we had an indication on TCAS for that traffic. After informing ATC we did not have traffic in sight we were given a right turn to heading 020 and 5000 ft. Shortly after that ATC began calling out additional traffic at 12 o'clock and instructing us to level off at our current altitude of 5300 ft; while at the same time we heard the TCAS system call 'traffic'. I kept my hand on the control and searched for traffic. Immediately the controller instructed us to climb while simultaneously the RA began instructing us to descend. We responded to and followed the RA and immediately afterwards we visually acquired the traffic. The ca advised ATC we were responding to an RA and descending. We were below the traffic as they passed overhead and at about a 12 o'clock position a few hundred feet above us. Once clear of conflict around 4000 feet we were given a heading to intercept final for runway 30L and the flight was completed without any further incident.
Original NASA ASRS Text
Title: Air carrier First Officer reported receiving conflicting information from ATC and automation when dealing with a traffic conflict.
Narrative: We were [a] flight from to SJC when we responded to an RA. During descent on the RAZRR 4 RNAV arrival we were passing through about 9000 ft we were given a turn to the south (perhaps about a 220 heading). We were given clearance to descent to 8000 ft. Then we were given direct to KLIDE and an altitude of 6000 ft. Shortly after; ATC called out traffic at 11 o'clock and 5 miles. We were unable to visually locate traffic although we had an indication on TCAS for that traffic. After informing ATC we did not have traffic in sight we were given a right turn to heading 020 and 5000 ft. Shortly after that ATC began calling out additional traffic at 12 o'clock and instructing us to level off at our current altitude of 5300 ft; while at the same time we heard the TCAS system call 'traffic'. I kept my hand on the control and searched for traffic. Immediately the controller instructed us to climb while simultaneously the RA began instructing us to descend. We responded to and followed the RA and immediately afterwards we visually acquired the traffic. The CA advised ATC we were responding to an RA and descending. We were below the traffic as they passed overhead and at about a 12 o'clock position a few hundred feet above us. Once clear of conflict around 4000 feet we were given a heading to intercept final for Runway 30L and the flight was completed without any 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.