Air carrier captain reported encountering wake vortex 11 miles in trail of a B747 on approach to lax...

Attributes
ACN	1036761
Time
Date	201209
Local Time Of Day	1201-1800
Place
Locale Reference	LAX.Airport
State Reference	CA
Environment
Flight Conditions	VMC
Aircraft 1
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	Descent
Route In Use	STAR RIIVR
Flight Plan	IFR
Aircraft 2
Make Model Name	B747 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	Descent
Person 1
Function	Captain Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 200 Flight Crew Total 14000 Flight Crew Type 4030
Events
Anomaly	Flight Deck / Cabin / Aircraft Event Illness Inflight Event / Encounter Wake Vortex Encounter

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.

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.

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.