B737 captain reported executing a go-around after encountering wake turbulence at 150 AGL on approac...

Attributes
ACN	1474888
Time
Date	201708
Local Time Of Day	1801-2400
Place
Locale Reference	SFO.Airport
State Reference	CA
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	B737 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	Final Approach
Flight Plan	IFR
Aircraft 2
Make Model Name	B777 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 Type 3955
Events
Anomaly	Inflight Event / Encounter Wake Vortex Encounter

Narrative:

Closely spaced parallel approach to sfo runway 28R. Approximately 1/2 mile behind B777 landing 28L. Winds were 250 at 6 kts. We noted a slight disturbance on the water surface in the bay from the wake turbulence. It was a gentle progression and we discussed go-around procedures again and elected to continue the approach. At approximately 150 ft; first officer noticed slight vibrations in the yoke (not stick shaker). Within one second the aircraft started rolling off to the left approximately 25 to 30 degrees left wing down and a go-around was already initiated at the first sign of roll off. After an approximate 5 kt loss; a go-around was normal. We returned for landing 28L without further incident.

Original NASA ASRS Text

Title: B737 Captain reported executing a go-around after encountering wake turbulence at 150 AGL on approach to SFO Runway 28R from a B777 on the parallel approach to Runway 28L.

Narrative: Closely spaced parallel approach to SFO Runway 28R. Approximately 1/2 mile behind B777 landing 28L. Winds were 250 at 6 Kts. We noted a slight disturbance on the water surface in the Bay from the wake turbulence. It was a gentle progression and we discussed go-around procedures again and elected to continue the approach. At approximately 150 ft; FO noticed slight vibrations in the yoke (not stick shaker). Within one second the aircraft started rolling off to the left approximately 25 to 30 degrees left wing down and a go-around was already initiated at the first sign of roll off. After an approximate 5 kt loss; a go-around was normal. We returned for landing 28L without further incident.

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.

B737 captain reported executing a go-around after encountering wake turbulence at 150 AGL on approach to sfo runway 28R from a B777 on the parallel approach to runway 28L.