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ZFW controller experienced a loss of separation event when failing to hear an incorrect altitude assignment read back; listing distractions and read back discipline as contributing factors.
| Attributes | |
| ACN | 884261 |
| Time | |
| Date | 201004 |
| Local Time Of Day | 1801-2400 |
| Place | |
| Locale Reference | ZFW.ARTCC |
| State Reference | TX |
| Aircraft 1 | |
| Make Model Name | King Air C90 E90 |
| Flight Phase | Descent |
| Route In Use | Vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Citation V/Ultra/Encore (C560) |
| Flight Phase | Cruise |
| Route In Use | Vectors |
| Flight Plan | IFR |
| Person 1 | |
| Function | Handoff / Assist |
| Qualification | Air Traffic Control Fully Certified |
| Events | |
| Anomaly | ATC Issue All Types Conflict Airborne Conflict |
Narrative:
Aircraft X was assigned 16;000 to remain above aircraft Y on a somewhat crossing reciprocal course. Aircraft X readback 10000; which I missed; I was somewhat distracted by an issue with fsi not complying with their letter of agreement and two aircraft I was attempting to enter flight plans on for the next portion of their flights. I noticed aircraft X descending through 16000; while obliquely converging with aircraft Y and about 7 miles away from aircraft Y; and questioned his altitude...I then turned both aircraft 40 degrees left immediately. Separation was probably lost for a short time; and as the aircraft were not a threat to converge; I simply had aircraft X stop his descent to stabilize the situation; he leveled at 14800. The aircraft; by this time; had already become separated. Recommendation; request assistance from the flm (front line manager) on the flight plan matter; it would have been useful training for a developmental. Focus more directly on the read backs; an area I usually pride myself on; but one that I apparently slipped on today.
Original NASA ASRS Text
Title: ZFW controller experienced a loss of separation event when failing to hear an incorrect altitude assignment read back; listing distractions and read back discipline as contributing factors.
Narrative: Aircraft X was assigned 16;000 to remain above Aircraft Y on a somewhat crossing reciprocal course. Aircraft X readback 10000; which I missed; I was somewhat distracted by an issue with FSI not complying with their Letter of Agreement and two aircraft I was attempting to enter flight plans on for the next portion of their flights. I noticed Aircraft X descending through 16000; while obliquely converging with Aircraft Y and about 7 miles away from Aircraft Y; and questioned his altitude...I then turned both aircraft 40 degrees left immediately. Separation was probably lost for a short time; and as the aircraft were not a threat to converge; I simply had Aircraft X stop his descent to stabilize the situation; he leveled at 14800. The aircraft; by this time; had already become separated. Recommendation; request assistance from the FLM (Front Line Manager) on the flight plan matter; it would have been useful training for a developmental. Focus more directly on the read backs; an area I usually pride myself on; but one that I apparently slipped on today.
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.