B777 Undifferentiated or Other Model
Flight Crew Air Transport Pilot (ATP)
Flight Crew Total 12862; Flight Crew Type 982
Deviation - Altitude Excursion From Assigned Altitude; Deviation - Speed All Types; Deviation / Discrepancy - Procedural Published Material / Policy; Inflight Event / Encounter Weather / Turbulence
Flight Crew Became Reoriented; Flight Crew FLC Overrode Automation; Flight Crew Regained Aircraft Control
Environment - Non Weather Related; Human Factors; Weather
The First Officer was the Pilot Flying; and was relatively new to the airplane. During climb on the departure; ATC assigned a heading of 090 degrees for weather. At acceleration altitude; the Captain selected Speed Intervene and 265 knots as a buffer above minimum clean maneuvering speed. During the climb; many altitude assignments were received and complied with. Passing approximately 15000 feet; I noticed the MCP was still in Speed Intervene; and I mentioned it to the First Officer; as there was a lot of difficult ATC communications happening. Approaching several cells; the aircraft encountered heavy moderate turbulence; and since the speed was close to the minimum; the stick shaker activated. The First Officer called out to lower the nose and increase power [and] made a public address to the flight attendants to be seated immediately. Concurrently; the Captain took control of the aircraft and initiated the stall recovery profile. I believe we lost around 2000 feet. The aircraft was recovered and resumed a normal climb and the flight attendants were asked to check in. [There were] no injuries.
B777 First Officer reported a stick shaker activation and loss of altitude.