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B737-700 captain reported executing a go-around after encountering wake turbulence from a B747 landing on the parallel runway at sfo.
| Attributes | |
| ACN | 1416878 |
| Time | |
| Date | 201701 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | SFO.Airport |
| State Reference | CA |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | B737-700 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Final Approach |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | B747 Undifferentiated or Other Model |
| Flight Phase | Landing |
| Flight Plan | IFR |
| Person 1 | |
| Function | Captain Pilot Not Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Last 90 Days 176 Flight Crew Type 8115 |
| Person 2 | |
| Function | First Officer Pilot Flying |
| Experience | Flight Crew Last 90 Days 214 |
| Events | |
| Anomaly | Inflight Event / Encounter Unstabilized Approach Inflight Event / Encounter Wake Vortex Encounter |
Narrative:
ATC sequenced us approximately 1.5-2 miles behind a B747 landing parallel runway; we were landing 28L and the B747 was ahead of us landing 28R. ATC notified us to use caution due to the possibility of wake turbulence. ATIS indicated wind was variable at five knots. The first officer purposely deviated slightly above glideslope (no more than one dot) and was flying an additional five knots above target speed. As we approached approximately 150-200 ft AGL; we started to encounter the wake turbulence from the B747 that had landed ahead of us. The first officer made good corrections but the updraft and lateral displacement put us in an unsafe position to land. We executed a go-around and were vectored back around for an uneventful landing.ATC sequencing us ahead of (or further behind) the B747 would have prevented this event. Because the wind was variable at only five knots; there was a significant potential for the wake turbulence to affect our landing on the parallel runway.
Original NASA ASRS Text
Title: B737-700 Captain reported executing a go-around after encountering wake turbulence from a B747 landing on the parallel runway at SFO.
Narrative: ATC sequenced us approximately 1.5-2 miles behind a B747 landing parallel runway; we were landing 28L and the B747 was ahead of us landing 28R. ATC notified us to use caution due to the possibility of wake turbulence. ATIS indicated wind was variable at five knots. The F/O purposely deviated slightly above glideslope (no more than one dot) and was flying an additional five knots above target speed. As we approached approximately 150-200 ft AGL; we started to encounter the wake turbulence from the B747 that had landed ahead of us. The F/O made good corrections but the updraft and lateral displacement put us in an unsafe position to land. We executed a go-around and were vectored back around for an uneventful landing.ATC sequencing us ahead of (or further behind) the B747 would have prevented this event. Because the wind was variable at only five knots; there was a significant potential for the wake turbulence to affect our landing on the parallel runway.
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.