B737 Next Generation Undifferentiated
Flight Crew Air Transport Pilot (ATP)
Flight Crew Type 5423
Inflight Event / Encounter Wake Vortex Encounter
Air Traffic Control Issued New Clearance; Air Traffic Control Provided Assistance; Flight Crew Regained Aircraft Control; Flight Crew Took Evasive Action
Environment - Non Weather Related; Procedure
ATC instructed us to climb from FL320 [to] FL340; we were IMC. Upon reaching close to FL340 aircraft suddenly encountered wake turbulence and rolled sharply to the left; autopilot disconnected and we received aural 'bank angle' warning. I believe the aircraft was around 45-50 degrees bank. I rolled wings level; we notified ATC; offset to the left and began a descent back to FL320. The seatbelt sign was on at the time. We called back to Flight Attendants who reported no injuries; but said one passenger was standing in the aft of aircraft and fell over. ATC informed us the traffic ahead of us was a 777-300 at FL340. I believe we were around 8-10 miles in trail. ATC offered us a climb or descent and offset up to 4 miles. We experienced no further wake after the initial event.
B737 Captain reported encountering wake turbulence at FL340 8-10 miles in trail of a B777 that resulted in a 'sharp' 45-50 degree roll to the left.