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ZFW ARTCC controller reported having numerous losses of separation due to fatigue and not observing the aircraft descend through each other.
| Attributes | |
| ACN | 1601962 |
| Time | |
| Date | 201812 |
| Local Time Of Day | 0001-0600 |
| Place | |
| Locale Reference | ZFW.ARTCC |
| State Reference | TX |
| Aircraft 1 | |
| Make Model Name | B737-700 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Descent |
| Route In Use | Vectors |
| Flight Plan | IFR |
| Person 1 | |
| Function | Enroute |
| Qualification | Air Traffic Control Fully Certified |
| Experience | Air Traffic Control Time Certified In Pos 1 (yrs) 3 |
| Events | |
| Anomaly | ATC Issue All Types Conflict Airborne Conflict Deviation - Procedural Clearance |
Narrative:
I was exhausted when I walked in the door. I took over r-side in the middle of holding for all dfw and dal arrivals. A few minutes after taking over; we were told to clear them all back in. I had a string of 5 dal arrivals and as the first one was 1 minute from approach boundary they called me and told me I was shut off again. I gave all the dal arrivals a heading and then a fix; frsti to hold at. I gave them; in sequence; holding instructions and altitudes to stack them on top of one another: 130; 140; 150; 160 and [I] believe 170 as the altitudes to hold.as the first few entered holding and the back aircraft were entering holding; approach called and had me bring them back in. I honestly didn't even see that they were descending through each other's altitudes until it was too late. Furthermore; once I saw them flashing it was already too late; there was no way to save it from being a deal so I just did my best to keep them safely separated. None really; better communication between D10 and ZFW tmu would be nice.
Original NASA ASRS Text
Title: ZFW ARTCC Controller reported having numerous losses of separation due to fatigue and not observing the aircraft descend through each other.
Narrative: I was exhausted when I walked in the door. I took over R-side in the middle of holding for all DFW and DAL arrivals. A few minutes after taking over; we were told to clear them all back in. I had a string of 5 DAL arrivals and as the first one was 1 minute from approach boundary they called me and told me I was shut off again. I gave all the DAL arrivals a heading and then a fix; FRSTI to hold at. I gave them; in sequence; holding instructions and altitudes to stack them on top of one another: 130; 140; 150; 160 and [I] believe 170 as the altitudes to hold.As the first few entered holding and the back aircraft were entering holding; Approach called and had me bring them back in. I honestly didn't even see that they were descending through each other's altitudes until it was too late. Furthermore; once I saw them flashing it was already too late; there was no way to save it from being a deal so I just did my best to keep them safely separated. None really; better communication between D10 and ZFW TMU would be nice.
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.