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ZAU controller described a loss of separation event when ZOB descended traffic after receiving approval but still in conflict with ZAU traffic; the reporter acknowledging conflicting traffic should have been referenced.
| Attributes | |
| ACN | 945640 |
| Time | |
| Date | 201104 |
| Local Time Of Day | 0001-0600 |
| Place | |
| Locale Reference | ZAU.ARTCC |
| State Reference | IL |
| Aircraft 1 | |
| Make Model Name | EMB ERJ 170/175 ER&LR |
| Operating Under FAR Part | Part 129 |
| Flight Phase | Cruise |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | A319 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Descent |
| Flight Plan | IFR |
| Person 1 | |
| Function | Enroute |
| Qualification | Air Traffic Control Fully Certified |
| Events | |
| Anomaly | ATC Issue All Types Conflict Airborne Conflict Deviation - Procedural Published Material / Policy |
Narrative:
I was talking to a E170 at FL360 northwest bound; a A319 was at FL370 eastbound; and communication was transfered to cleveland center. Cleveland center called requesting control to descend the A319. I did not reference my traffic (the E170); I thought they were watching traffic; but they weren't because he came from a different sector. Separation was lost when they descended the A319. Recommendation: always reference known traffic and don't assume anything!
Original NASA ASRS Text
Title: ZAU Controller described a loss of separation event when ZOB descended traffic after receiving approval but still in conflict with ZAU traffic; the reporter acknowledging conflicting traffic should have been referenced.
Narrative: I was talking to a E170 at FL360 northwest bound; a A319 was at FL370 eastbound; and communication was transfered to Cleveland Center. Cleveland Center called requesting control to descend the A319. I did not reference my traffic (the E170); I thought they were watching traffic; but they weren't because he came from a different sector. Separation was lost when they descended the A319. Recommendation: always reference known traffic and don't assume anything!
Data retrieved from NASA's ASRS site as of April 2012 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.