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Enroute controller described a loss of separation event when failing to note conflicting traffic prior to a descent clearance and then having corrective clearances blocked.
| Attributes | |
| ACN | 981417 |
| Time | |
| Date | 201111 |
| Local Time Of Day | 0001-0600 |
| Place | |
| Locale Reference | ZZZ.ARTCC |
| State Reference | US |
| Aircraft 1 | |
| Make Model Name | A319 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Descent |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | B737-300 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Cruise |
| Flight Plan | IFR |
| Person 1 | |
| Function | Enroute |
| Qualification | Air Traffic Control Fully Certified |
| Events | |
| Anomaly | ATC Issue All Types Conflict Airborne Conflict |
Narrative:
Traffic volume had just slowed down; I relaxed my focus for a few seconds; and then I gave an A319 a clearance to descend to FL300 from FL350 to meet ZOB LOA. I over looked a B737 at FL340. I re-cleared the A319 to FL350 and tried to clear the B737 to descend to FL320 but misspoke and cleared the B737 to FL340. When I tried to correct myself; the B737 and I stepped on each other twice.
Original NASA ASRS Text
Title: Enroute Controller described a loss of separation event when failing to note conflicting traffic prior to a descent clearance and then having corrective clearances blocked.
Narrative: Traffic volume had just slowed down; I relaxed my focus for a few seconds; and then I gave an A319 a clearance to descend to FL300 from FL350 to meet ZOB LOA. I over looked a B737 at FL340. I re-cleared the A319 to FL350 and tried to clear the B737 to descend to FL320 but misspoke and cleared the B737 to FL340. When I tried to correct myself; the B737 and I stepped on each other twice.
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.