Narrative:

We were descending through 15;000 ft near gramm intersection on the RIIVR2 arrival into lax. Autopilot and seatbelt sign were both on. We encountered wake turbulence with caused one moderate jolt including a 10 degree roll to the right. One other jolt occurred seconds later. We asked ATC what aircraft we were following. Sct said we were following a B747 eleven miles ahead. Flight attendant was in the aisle picking up trash. She said she went to the floor. Upon landing I was informed by her of the event and that she was feeling a mid-back pain. She did not ask for medical assistance at the time; but feared she would be sore the next day and would therefore be filing a report.

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Original NASA ASRS Text

Title: Air Carrier Captain reported encountering wake vortex 11 miles in trail of a B747 on approach to LAX; resulting in turbulence and roll. One Flight Attendant reported back pain as a result.

Narrative: We were descending through 15;000 FT near GRAMM Intersection on the RIIVR2 arrival into LAX. Autopilot and seatbelt sign were both on. We encountered wake turbulence with caused one moderate jolt including a 10 degree roll to the right. One other jolt occurred seconds later. We asked ATC what aircraft we were following. SCT said we were following a B747 eleven miles ahead. Flight Attendant was in the aisle picking up trash. She said she went to the floor. Upon landing I was informed by her of the event and that she was feeling a mid-back pain. She did not ask for medical assistance at the time; but feared she would be sore the next day and would therefore be filing a report.

Data retrieved from NASA's ASRS site as of July 2013 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.