Flight Crew Air Transport Pilot (ATP)
Flight Crew Type 6738
Inflight Event / Encounter Wake Vortex Encounter
General Physical Injury / Incapacitation
Procedure
Clear to descend the HLYWD 1 arrival. At FL280 we were hit with wake turbulence; it was brief; one thump. The aircraft in front of us was also [a] B757 at FL260 and 8 miles ahead. I asked SoCal [and] he told me what type and how far. I called in the back to make sure everybody was OK. [One] FA bumped her shoulder. She said she was OK.
B757 Captain reported encountering wake turbulence from a preceding B757 on arrival into LAX.