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Controller reported less than standard wake turbulence separation due to compression on final; with lead aircraft on tower frequency.
| Attributes | |
| ACN | 977777 |
| Time | |
| Date | 201111 |
| Local Time Of Day | 1801-2400 |
| Place | |
| Locale Reference | OGG.Airport |
| State Reference | HI |
| Aircraft 1 | |
| Make Model Name | B757 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Final Approach |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | B767 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Final Approach |
| Flight Plan | IFR |
| Person 1 | |
| Function | Approach |
| Qualification | Air Traffic Control Fully Certified |
| Events | |
| Anomaly | ATC Issue All Types Deviation - Procedural Published Material / Policy |
Narrative:
The B757 [was] cleared for an ILS at 13 mile final at 170 KTS ground speed. The B767 seven miles in trail [was] also cleared for an ILS indicating 220 KTS ground speed instructed to reduce speed to 170 KTS. This is at XA35z. I am subsequently relieved from position. At XA39z the B757 is at 110 KTS and 900 ft 4 NM final and the B767 an 8 NM final at 150 KTS. A loss of wake turbulence separation occurred. Both aircraft were on tower frequency. It's hard to anticipate the lead aircraft slowing to 110 KTS; and not having the second aircraft on my frequency. When I left the position the spacing looked good and the speeds were similar.
Original NASA ASRS Text
Title: Controller reported less than standard wake turbulence separation due to compression on final; with lead aircraft on Tower frequency.
Narrative: The B757 [was] cleared for an ILS at 13 mile final at 170 KTS ground speed. The B767 seven miles in trail [was] also cleared for an ILS indicating 220 KTS ground speed instructed to reduce speed to 170 KTS. This is at XA35z. I am subsequently relieved from position. At XA39z the B757 is at 110 KTS and 900 FT 4 NM final and the B767 an 8 NM final at 150 KTS. A loss of wake turbulence separation occurred. Both aircraft were on Tower frequency. It's hard to anticipate the lead aircraft slowing to 110 KTS; and not having the second aircraft on my frequency. When I left the position the spacing looked good and the speeds were similar.
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.