B737 Next Generation Undifferentiated
Flight Crew Air Transport Pilot (ATP)
Flight Crew Total 11376; Flight Crew Type 5700
Inflight Event / Encounter Loss Of Aircraft Control; Inflight Event / Encounter Wake Vortex Encounter
Air Traffic Control Issued New Clearance; Flight Crew Regained Aircraft Control; Flight Crew Requested ATC Assistance / Clarification
Procedure; Environment - Non Weather Related
We were following a B777. We were in visual contact; however SFO is now requiring vectors to ILS during night time hours. Downwind we encountered some wake turbulence and advised ATC. On base leg we encountered stronger wake turbulence that put the aircraft into a greater than 30 degree left bank; generating 'Attitude' alert. The FO was pilot flying and disconnected the autopilot and recovered. We advised ATC and they said that we were 6 miles in trail of the B777. They gave us vectors to have greater spacing. No further encounters.
While being vectored to final approach runway 28R; experienced a wake upset behind a B777. Approximately 60 degrees bank angle. I overpowered the controls and disconnected the auto pilot. The Captain had previously reported an earlier wake of lesser degree to the Controller. After the second wake event; the Captain again reported and queried the separation mileage. The Controller stated 5 miles were the minimums and that there was at least that. The Controller provided an extended vector and no further problems occurred.
B737 flight crew reported encountering wake turbulence on approach to SFO 6 miles in trail of a B777 that resulted in a 60 degree bank.