Clear air turbulence. Air carrier large transport aircraft encountered in-flight unexpected turbulence during high altitude cruise causing flight attendant injuries.

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Attributes
ACN	211998
Time
Date	199206
Day	Tue
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : gls
State Reference	TX
Altitude	msl bound lower : 29000 msl bound upper : 29000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 3 Turbojet Eng
Flight Phase	cruise other
Route In Use	enroute airway : a766
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : second officer
Qualification	pilot : flight engineer pilot : commercial pilot : atp pilot : instrument
Experience	flight time last 90 days : 150 flight time total : 5000 flight time type : 650
ASRS Report	211998
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : instrument pilot : commercial pilot : cfi pilot : atp
Experience	flight time last 90 days : 240 flight time total : 14000 flight time type : 1470
ASRS Report	211809
Events
Anomaly	inflight encounter : weather other anomaly other
Independent Detector	other flight crewa
Resolutory Action	flight crew : exited adverse environment other
Consequence	other Other
Supplementary
Primary Problem	Weather
Air Traffic Incident	other

Narrative:

At FL290 the aircraft entered a zone of light chop while IMC. The radar was painting no precipitation. The aircraft suddenly experienced several violent vertical jolts, the last and most violent strong enough to elevate anything not tied down. This caused an aisle cart to fall on a cabin crew member injuring her foot. ZHU was contacted and we initiated an immediate return to iah. Supplemental information from acn 211809: due to cruise conditions, the seatbelt sign was kept on.

Original NASA ASRS Text

Title: CLR AIR TURB. ACR LGT ACFT ENCOUNTERED INFLT UNEXPECTED TURB DURING HIGH ALT CRUISE CAUSING FLT ATTENDANT INJURIES.

Narrative: AT FL290 THE ACFT ENTERED A ZONE OF LIGHT CHOP WHILE IMC. THE RADAR WAS PAINTING NO PRECIPITATION. THE ACFT SUDDENLY EXPERIENCED SEVERAL VIOLENT VERT JOLTS, THE LAST AND MOST VIOLENT STRONG ENOUGH TO ELEVATE ANYTHING NOT TIED DOWN. THIS CAUSED AN AISLE CART TO FALL ON A CABIN CREW MEMBER INJURING HER FOOT. ZHU WAS CONTACTED AND WE INITIATED AN IMMEDIATE RETURN TO IAH. SUPPLEMENTAL INFO FROM ACN 211809: DUE TO CRUISE CONDITIONS, THE SEATBELT SIGN WAS KEPT ON.

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.