B737-300 crew encountered wake turbulence from a B747-400 9 mi ahead on approach to sfo.

Attributes
ACN	560580
Time
Date	200209
Day	Sat
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : sfo.airport
State Reference	CA
Altitude	msl single value : 14000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : sfo.tower tower : dfw.tower
Operator	common carrier : air carrier
Make Model Name	B737-300
Operating Under FAR Part	Part 121
Flight Phase	descent : intermediate altitude
Flight Plan	IFR
Aircraft 2
Controlling Facilities	tower : sfo.tower
Operator	common carrier : air carrier
Make Model Name	B747-400
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 150 flight time total : 12000 flight time type : 1641
ASRS Report	560580
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : cfi pilot : commercial pilot : multi engine
Events
Anomaly	cabin event other inflight encounter : wake turbulence inflight encounter : weather inflight encounter other
Independent Detector	aircraft equipment : tcas other flight crewa other flight crewb other other : 4.5
Resolutory Action	none taken : detected after the fact
Consequence	other other
Supplementary
Problem Areas	Environmental Factor Weather Airport
Primary Problem	Ambiguous

Narrative:

Following a B747-400 at approximately 9 mi on TCASII in descent, encountered wake turbulence. Aircraft rolled approximately 30 degrees right with nearly full travel aileron correction to the left. Recovered within 5-10 seconds. Flight attendants immediately sat on the floor. 1 flight attendant possibly bruised her knee on a seat during the initial encounter. No other injuries reported.

Original NASA ASRS Text

Title: B737-300 CREW ENCOUNTERED WAKE TURB FROM A B747-400 9 MI AHEAD ON APCH TO SFO.

Narrative: FOLLOWING A B747-400 AT APPROX 9 MI ON TCASII IN DSCNT, ENCOUNTERED WAKE TURB. ACFT ROLLED APPROX 30 DEGS R WITH NEARLY FULL TRAVEL AILERON CORRECTION TO THE L. RECOVERED WITHIN 5-10 SECONDS. FLT ATTENDANTS IMMEDIATELY SAT ON THE FLOOR. 1 FLT ATTENDANT POSSIBLY BRUISED HER KNEE ON A SEAT DURING THE INITIAL ENCOUNTER. NO OTHER INJURIES RPTED.

Data retrieved from NASA's ASRS site as of July 2007 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.