Date: 201701
Local time of day: 1201-1800
Location: SFO.Airport, CA
Flight conditions: IMC
Weather elements / visibility: Rain; Turbulence; Windshear
Light: Daylight
Aircraft: Widebody Transport
Operator: Air Carrier
Operating under: Part 121
Flight plan: IFR
Mission: Passenger
Flight phase: Takeoff / Launch
Airspace: Class B SFO
ATC / advisory: Tower SFO
Reporter organization: Air Carrier
Reporter function: Captain; Pilot Flying
Reporter qualification: Flight Crew Air Transport Pilot (ATP)
Second reporter function: Pilot Not Flying; First Officer
Anomaly: Inflight Event / Encounter Weather / Turbulence
Detector: Automation Aircraft Other Automation; Person Flight Crew
When detected: In-flight
Result: Flight Crew FLC complied w / Automation / Advisory
Contributing factors: Aircraft; Airport; Human Factors; Weather
Primary problem: Weather

Narrative: Due to strong south winds (180@34 gusts to 48) coordinated with dispatch and planned Runway 19L departure at SFO. The takeoff was with maximum power and flaps 20 for runway performance reasons. LNAV/VNAV armed-engaged; and used the NADP 1 (ICAO) climb procedure for terrain considerations.  There was no convective windshear at or associated with the departure runway on ATIS. Used the LNAV track on the MOLEN 8 SID and started the 90 degree left turn as per charted track guidance or about 400-500 AGL. Encountered moderate turbulence and wind gusts which rolled the aircraft from the established 30 degree bank angle to 40-45 degrees bank angle several times during the turn.  Associated warning BANK ANGLE sounded. At about 1100 AGL the reactive wind shear system detected a loss of climb performance and sounded; followed procedure with the exception of rolling the wings level in order to continue the turn away from rising terrain. The loss of climb performance resulted in almost no vertical climb for a few seconds and then the windshear alert ended by 1200 AGL. After stabilized in the climb and departure SID heading (track) reported to ATC and SATCOM call to dispatch.


Second narrative: Strong gusty winds with LLWS in the ATIS. Airport configuration was landing and takeoff on the Runway 19 complex. We actually asked for 19L. Captain had already coordinated reducing payload to make the takeoff possible. Delayed pushback due to gate hold procedures. We taxied out to 19L and sat there for probably 20 minutes as planes took off on 19R and landed on 19L. When cleared for takeoff winds were 180/34g48. We had planned flaps 20 max thrust SFO 8 departure with LNAV/VNAV and the NADP1 climb. That departure calls for a big turn to avoid terrain. The takeoff roll was rather long (expected). We lifted off and at 400 feet the turn was started. It was really bumpy. The winds lifted the wing and we got a BANK ANGLE warning. I think I saw about 45 degrees. Captain recovered; and continued our left turn to follow the Sid. Once again we got a bank angle warning followed immediately with a WINDSHEAR WINDSHEAR WINDSHEAR. All hands on deck. Procedures were followed except we kept the turn going. We were out of the WINDSHEAR in about 10 seconds I believe. Once fully recovered and proceeding on the Sid I reported the WINDSHEAR (20 knot loss of airspeed to the tower). The relief pilot informed dispatch.


Synopsis: Air carrier flight crew described a Runway 19L departure from SFO in bad weather. During the required low altitude turn for terrain; moderate turbulence was encountered along with several bank angle warnings and a windshear warning.