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While waiting for an aircraft to check in on frequency; another aircraft of the same company checked on to the frequency at 33000 feet. The controller inadvertently descended this aircraft to 31000 feet resulting in a TCAS alert for conflicting traffic. The controller then advised the descending aircraft to maintain 33000 feet.
| Attributes | |
| ACN | 1315695 |
| Time | |
| Date | 201512 |
| Local Time Of Day | 0001-0600 |
| Place | |
| Locale Reference | ZZZ.ARTCC |
| State Reference | US |
| Environment | |
| Light | Dusk |
| Aircraft 1 | |
| Make Model Name | Light Transport Low Wing 2 Turbojet Eng |
| 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) 21 |
| Person 2 | |
| Function | Supervisor / CIC Enroute |
| Qualification | Air Traffic Control Fully Certified |
| Experience | Air Traffic Control Time Certified In Pos 1 (yrs) 9 |
| Events | |
| Anomaly | ATC Issue All Types Conflict Airborne Conflict Deviation - Procedural Published Material / Policy |
Narrative:
Working an arrival sequence. Waiting on aircraft X to check on to descend from 34000 feet to 31000 feet. Aircraft Y checks on at 33000 feet. My attention was on aircraft X to descend to get down under traffic. I inadvertently issued descent clearance to aircraft Y on his initial check on to 31000 feet thinking it was aircraft X. Aircraft Z was westbound at 32000 feet. Aircraft Y reported a TCAS alert and that he was going to stop his descent; I advised him to please stop his descent and maintain 33000 feet. At the time I believed it was a pilot deviation on aircraft Y until aircraft X finally checks on at 34000 feet.needed to exercise more patience to issue a clearance; and make sure it is to the correct aircraft.
Original NASA ASRS Text
Title: While waiting for an aircraft to check in on frequency; another aircraft of the same company checked on to the frequency at 33000 feet. The Controller inadvertently descended this aircraft to 31000 feet resulting in a TCAS alert for conflicting traffic. The Controller then advised the descending aircraft to maintain 33000 feet.
Narrative: Working an arrival sequence. Waiting on Aircraft X to check on to descend from 34000 feet to 31000 feet. Aircraft Y checks on at 33000 feet. My attention was on Aircraft X to descend to get down under traffic. I inadvertently issued descent clearance to Aircraft Y on his initial check on to 31000 feet thinking it was Aircraft X. Aircraft Z was westbound at 32000 feet. Aircraft Y reported a TCAS Alert and that he was going to stop his descent; I advised him to please stop his descent and maintain 33000 feet. At the time I believed it was a pilot deviation on Aircraft Y until Aircraft X finally checks on at 34000 feet.Needed to exercise more patience to issue a clearance; and make sure it is to the correct aircraft.
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.