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ZOB controller described a loss of separation event when an improver clearance read back was not noted.
| Attributes | |
| ACN | 935436 |
| Time | |
| Date | 201103 |
| Local Time Of Day | 1801-2400 |
| Place | |
| Locale Reference | ZOB.ARTCC |
| State Reference | OH |
| Aircraft 1 | |
| Make Model Name | Regional Jet 200 ER/LR (CRJ200) |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Cruise |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | B737 Undifferentiated or Other Model |
| Flight Phase | Climb |
| Flight Plan | IFR |
| Person 1 | |
| Function | Enroute |
| Qualification | Air Traffic Control Fully Certified |
| Events | |
| Anomaly | Conflict Airborne Conflict Deviation - Altitude Excursion From Assigned Altitude Deviation - Procedural Clearance |
Narrative:
I cleared a B757 to FL280; another air carrier's B737 took the clearance and climbed into a CRJ22 level at FL260 direct to yqo. I thought the B737 was checking on my frequency; while looking for aircraft; the B757 asked if the clearance was for them; and advised me that another aircraft took the clearance. I asked 'other aircraft responding say again' after ten or fifteen seconds the B737 and the CRJ2 both said they were responding to an RA.
Original NASA ASRS Text
Title: ZOB Controller described a loss of separation event when an improver clearance read back was not noted.
Narrative: I cleared a B757 to FL280; another Air Carrier's B737 took the clearance and climbed into a CRJ22 Level at FL260 direct to YQO. I thought the B737 was checking on my frequency; while looking for aircraft; the B757 asked if the clearance was for them; and advised me that another aircraft took the clearance. I asked 'other aircraft responding say again' after ten or fifteen seconds the B737 and the CRJ2 both said they were responding to an RA.
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.