Flight crew of a B777 returned to land after 4 flight attendants were injured as a result of experiencing severe turbulence during climb just prior to leveloff.

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Attributes
ACN	439573
Time
Date	199906
Day	Mon
Local Time Of Day	0601 To 1200
Place
Locale Reference	navaid : dub.vortac
State Reference	FO
Altitude	msl bound lower : 30300 msl bound upper : 31000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : egtt.artcc
Operator	common carrier : air carrier
Make Model Name	B777 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	other other vortac
Flight Phase	climbout : vacating altitude
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : flight engineer pilot : instrument pilot : multi engine pilot : commercial
Experience	flight time last 90 days : 250 flight time total : 20000 flight time type : 300
ASRS Report	439573
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	inflight encounter : wake turbulence other anomaly
Independent Detector	other other : cab 3
Resolutory Action	flight crew : landed as precaution flight crew : diverted to another airport
Consequence	other
Supplementary
Problem Areas	Weather Environmental Factor
Primary Problem	Environmental Factor

Narrative:

We departed lhr for ewr at XA00. I was hand-flying the aircraft prior to reaching our assigned FL310. Conditions were VFR and very smooth. The flight attendants were in the aisle. At approximately FL303 we encountered severe turbulence. Speed increased to the red line followed by rolls in both directions. Duration was approximately 30 seconds. 4 flight attendants were injured. One broke bones in her foot. We returned to lhr. No other aircraft reported turbulence. I suspect we hit wake turbulence.

Original NASA ASRS Text

Title: FLC OF A B777 RETURNED TO LAND AFTER 4 FLT ATTENDANTS WERE INJURED AS A RESULT OF EXPERIENCING SEVERE TURB DURING CLB JUST PRIOR TO LEVELOFF.

Narrative: WE DEPARTED LHR FOR EWR AT XA00. I WAS HAND-FLYING THE ACFT PRIOR TO REACHING OUR ASSIGNED FL310. CONDITIONS WERE VFR AND VERY SMOOTH. THE FLT ATTENDANTS WERE IN THE AISLE. AT APPROX FL303 WE ENCOUNTERED SEVERE TURB. SPD INCREASED TO THE RED LINE FOLLOWED BY ROLLS IN BOTH DIRECTIONS. DURATION WAS APPROX 30 SECONDS. 4 FLT ATTENDANTS WERE INJURED. ONE BROKE BONES IN HER FOOT. WE RETURNED TO LHR. NO OTHER ACFT RPTED TURB. I SUSPECT WE HIT WAKE TURB.

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.