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Air carrier flight crew reported an altitude deviation during arrival resulting in an airborne conflict.
| Attributes | |
| ACN | 1764540 |
| Time | |
| Date | 202010 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | ZZZ.TRACON |
| State Reference | US |
| Aircraft 1 | |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Descent |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Commercial Fixed Wing |
| Person 1 | |
| Function | Pilot Not Flying Captain |
| Qualification | Flight Crew Air Transport Pilot (ATP) Flight Crew Instrument Flight Crew Multiengine |
| Person 2 | |
| Function | Pilot Flying First Officer |
| Qualification | Flight Crew Air Transport Pilot (ATP) Flight Crew Instrument Flight Crew Multiengine |
| Events | |
| Anomaly | Deviation - Altitude Overshoot Deviation - Procedural Clearance |
Narrative:
We were descending on the ZZZZZ4 arrival north of zzzzz when ATC issued a traffic advisory of an aircraft Y at 12 o'clock. The first officer was pilot flying and I was looking for the traffic along with the relief pilot. I reported the traffic in sight and meanwhile the pilot flying descended below 9;000 before reaching zzzzz. The controller said maintain 9;000 and maintain visual separation with the aircraft Y and we returned to 9;000.if the controller had said maintain 9;000 and then issued the traffic; I believe the error would have been prevented. Fatigue was certainly a factor.
Original NASA ASRS Text
Title: Air carrier flight crew reported an altitude deviation during arrival resulting in an airborne conflict.
Narrative: We were descending on the ZZZZZ4 arrival north of ZZZZZ when ATC issued a traffic advisory of an Aircraft Y at 12 o'clock. The FO was pilot flying and I was looking for the traffic along with the Relief Pilot. I reported the traffic in sight and meanwhile the pilot flying descended below 9;000 before reaching ZZZZZ. The Controller said maintain 9;000 and maintain visual separation with the Aircraft Y and we returned to 9;000.If the Controller had said maintain 9;000 and then issued the traffic; I believe the error would have been prevented. Fatigue was certainly a factor.
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.