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ZOB center controllers working adjacent sectors reported one of them gave a descent clearance to an aircraft with another aircraft on a conflicting route.
| Attributes | |
| ACN | 1656575 |
| Time | |
| Date | 201906 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | ZOB.ARTCC |
| State Reference | OH |
| Aircraft 1 | |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Descent |
| Route In Use | Direct |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Cruise |
| Route In Use | Direct |
| Flight Plan | IFR |
| Person 1 | |
| Function | Enroute |
| Qualification | Air Traffic Control Fully Certified |
| Experience | Air Traffic Control Time Certified In Pos 1 (yrs) 1.5 |
| Person 2 | |
| Function | Enroute |
| Qualification | Air Traffic Control Fully Certified |
| Experience | Air Traffic Control Time Certified In Pos 1 (yrs) 7.5 |
| Events | |
| Anomaly | ATC Issue All Types Conflict Airborne Conflict |
Narrative:
I had just taken the position. One of the aircraft I had was aircraft X. This aircraft was at 39;000 feet still in the adjacent sector's airspace with a crossing at a intersection at 25;000 feet. I am assuming that the sector had handed off the aircraft with a discretionary descent; but this was not explicitly stated in the briefing. Shortly after sitting down; the aircraft reported leaving 39;000 feet for the crossing. Right after he said this; conflict alert activated with aircraft Y who was in their airspace at 38;000 feet. This was the first I knew of this aircraft. Once ca (conflict alert) activated I issued a vector 30 degrees right for the traffic and coordinated. He said he had turned aircraft Y; but the vector turned out to be insufficient. We lost separation with approximately 4.8 miles and less than 1;000 feet.
Original NASA ASRS Text
Title: ZOB Center Controllers working adjacent sectors reported one of them gave a descent clearance to an aircraft with another aircraft on a conflicting route.
Narrative: I had just taken the position. One of the aircraft I had was Aircraft X. This aircraft was at 39;000 feet still in the adjacent sector's airspace with a crossing at a intersection at 25;000 feet. I am assuming that the sector had handed off the aircraft with a discretionary descent; but this was not explicitly stated in the briefing. Shortly after sitting down; the aircraft reported leaving 39;000 feet for the crossing. Right after he said this; Conflict Alert activated with Aircraft Y who was in their airspace at 38;000 feet. This was the first I knew of this aircraft. Once CA (Conflict Alert) activated I issued a vector 30 degrees right for the traffic and coordinated. He said he had turned Aircraft Y; but the vector turned out to be insufficient. We lost separation with approximately 4.8 miles and less than 1;000 feet.
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.