B737 Next Generation Undifferentiated
Flight Crew Air Transport Pilot (ATP)
Flight Crew Last 90 Days 250; Flight Crew Total 18000; Flight Crew Type 12000
Inflight Event / Encounter Wake Vortex Encounter
Air Traffic Control Issued New Clearance; Air Traffic Control Provided Assistance; Flight Crew Took Evasive Action; Flight Crew Requested ATC Assistance / Clarification
Environment - Non Weather Related; Procedure
During IRNMN arrival descent into LAX we encountered a small amount of turbulence I would classify as light above FL190 that felt like wake turbulence so we asked ATC who we were following.  Oakland Center responded that it was a B767.  We were surprised that we got the wake off them with 10 miles separation but it was minor.  Winds were light aloft.  After we got on to Approach Control frequency and were still descending via the arrival we received a little more that was stronger and I had the First Officer seat the flight attendants over the PA.Just as we were in the LNAV turn over BAYST to JUUSE at approximately 10;000 feet we encountered moderate wake turbulence from the B767 that was still 9 miles ahead of us and we encountered significant roll rates with the wake turbulence and banked about 25 degrees Left.  I was holding the controls to stabilize the aircraft and the autopilot kicked into Control Wheel Steering Pitch and Roll because I was countering the significant left roll.  The First Officer was still off seating the flight attendants so I told Approach Control we were encountering wake turbulence and we needed an immediate turn away from the B767.When countering the wake roll we ended up slightly south of the magenta line; maybe .1 or .2 Actual Navigation Performance due to arrival turn when the wake was encountered so I manually flew the aircraft back on the LNAV track.  ATC then gave us a 070 heading and to maintain 9;000 feet while in the process of flying the magenta line.  We were vectored north of the B767 and then we preformed the RNAV Y 24R and the B767 was sent to the south Runway 25L.  We encountered no further wake turbulence.  We checked on the status of the flight attendants and they were OK and they did their final checks from their jumpseats.  Upon arrival at the gate; I personally checked with all the flight attendants to explain what happened and to verify one more time that they were OK; which they were.
Reporter stated he was surprised at the strength of the rolling motion when they had 9 miles separation.
B737NG Captain reported encountering wake turbulence on descent into LAX in trail of a B767.