A B777-200 over the pacific in trail of and 1000 ft below a B747 encountered moderate wake turbulence. A flight attendant was injured when a galley cart was toppled onto her.

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Attributes
ACN	708561
Time
Date	200608
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : zoa.artcc
State Reference	CA
Environment
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B777-200
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	cruise : level
Route In Use	enroute : pacific
Flight Plan	IFR
Aircraft 2
Controlling Facilities	artcc : zoa.artcc
Operator	common carrier : air carrier
Make Model Name	B747 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	cruise : level
Route In Use	enroute : pacific
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Experience	flight time last 90 days : 148 flight time total : 10000 flight time type : 486
ASRS Report	708561
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	inflight encounter : wake turbulence
Independent Detector	other flight crewa
Resolutory Action	none taken : detected after the fact
Consequence	other
Supplementary
Problem Areas	Airspace Structure Environmental Factor
Primary Problem	Environmental Factor

Narrative:

We were at FL380 20 NM in trail of a B747 that was at FL390. Light turbulence encountered; seatbelt sign turned on and flight attendants instructed to be seated via PA. Turbulence increased to occasional moderate; galley cart fell on back of flight attendant that had sat on the floor in the aft galley. She complained of back pain; was met in sfo by a flight attendant supervisor and was to be taken to a nearby hospital for evaluation.

Original NASA ASRS Text

Title: A B777-200 OVER THE PACIFIC IN TRAIL OF AND 1000 FT BELOW A B747 ENCOUNTERED MODERATE WAKE TURB. A FLT ATTENDANT WAS INJURED WHEN A GALLEY CART WAS TOPPLED ONTO HER.

Narrative: WE WERE AT FL380 20 NM IN TRAIL OF A B747 THAT WAS AT FL390. LIGHT TURB ENCOUNTERED; SEATBELT SIGN TURNED ON AND FLT ATTENDANTS INSTRUCTED TO BE SEATED VIA PA. TURB INCREASED TO OCCASIONAL MODERATE; GALLEY CART FELL ON BACK OF FLT ATTENDANT THAT HAD SAT ON THE FLOOR IN THE AFT GALLEY. SHE COMPLAINED OF BACK PAIN; WAS MET IN SFO BY A FLT ATTENDANT SUPVR AND WAS TO BE TAKEN TO A NEARBY HOSPITAL FOR EVALUATION.

Data retrieved from NASA's ASRS site as of January 2009 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.