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S46 TRACON controller turned an aircraft on to the final approach course with less than required wake turbulence separation behind the preceding heavy aircraft.
| Attributes | |
| ACN | 1358826 |
| Time | |
| Date | 201605 |
| Local Time Of Day | 0001-0600 |
| Place | |
| Locale Reference | S46.TRACON |
| State Reference | WA |
| Aircraft 1 | |
| Make Model Name | Dash 8 Series Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Initial Approach |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | B747 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Descent |
| Flight Plan | IFR |
| Person 1 | |
| Function | Approach |
| Qualification | Air Traffic Control Fully Certified |
| Experience | Air Traffic Control Time Certified In Pos 1 (yrs) 2.0 |
| Events | |
| Anomaly | ATC Issue All Types Deviation - Procedural Clearance Deviation - Procedural Published Material / Policy |
Narrative:
I had a heavy jet join the localizer at 5;000 feet and based aircraft X behind it at 4;000 feet to keep him below the wake turbulence. I turned aircraft X to join the localizer for the parallel runway. Instead of waiting until aircraft X was established on the localizer I cleared the heavy aircraft for the approach. I should have waited just a little bit longer or kept aircraft X on a divergent heading. I also could have descended aircraft X sooner and then cleared the heavy.
Original NASA ASRS Text
Title: S46 TRACON Controller turned an aircraft on to the final approach course with less than required wake turbulence separation behind the preceding Heavy aircraft.
Narrative: I had a heavy jet join the localizer at 5;000 feet and based Aircraft X behind it at 4;000 feet to keep him below the wake turbulence. I turned Aircraft X to join the localizer for the parallel runway. Instead of waiting until Aircraft X was established on the localizer I cleared the Heavy aircraft for the approach. I should have waited just a little bit longer or kept Aircraft X on a divergent heading. I also could have descended Aircraft X sooner and then cleared the Heavy.
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.