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Dfw tower controller reported a loss of separation attributed to forgetting the 'recat' rules pertaining to a departure behind a B757.
| Attributes | |
| ACN | 1703170 |
| Time | |
| Date | 201911 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | DFW.Tower |
| State Reference | TX |
| Aircraft 1 | |
| Make Model Name | Small Transport |
| Operating Under FAR Part | Part 135 |
| Flight Phase | Takeoff |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | B757 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Initial Climb |
| Flight Plan | IFR |
| Person 1 | |
| Function | Local |
| Qualification | Air Traffic Control Fully Certified |
| Experience | Air Traffic Control Time Certified In Pos 1 (yrs) 12 |
| Events | |
| Anomaly | ATC Issue All Types Conflict Ground Conflict Less Severe Deviation - Procedural Published Material / Policy Deviation - Procedural Clearance |
Narrative:
I was working local control. Aircraft X (small transport) pulled up to the runway and I put him in the drop down list for release for departure with TRACON. Aircraft Y (B757) pulled up behind aircraft X and since I had not gotten the release from TRACON; I moved aircraft Y around aircraft X and cleared him for takeoff. After aircraft Y rolled; I received the release and put aircraft X in position and launched him 6;000 feet and airborne. I did not wait the full two minutes needed behind a B757.I forgot about the wake turbulence rule. Since recat and B757 being treated differently as it pertains to wake turbulence; the rule just slipped my mind. My recommendation would be for me to remember the rule.
Original NASA ASRS Text
Title: DFW Tower Controller reported a loss of separation attributed to forgetting the 'RECAT' rules pertaining to a departure behind a B757.
Narrative: I was working Local Control. Aircraft X (small transport) pulled up to the runway and I put him in the drop down list for release for departure with TRACON. Aircraft Y (B757) pulled up behind Aircraft X and since I had not gotten the release from TRACON; I moved Aircraft Y around Aircraft X and cleared him for takeoff. After Aircraft Y rolled; I received the release and put Aircraft X in position and launched him 6;000 feet and airborne. I did not wait the full two minutes needed behind a B757.I forgot about the wake turbulence rule. Since RECAT and B757 being treated differently as it pertains to wake turbulence; the rule just slipped my mind. My recommendation would be for me to remember the rule.
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.