Flight crew of large transport at FL350 had severe turbulence 500 down to 1000 up. Cabin attendant i...

Attributes
ACN	192060
Time
Date	199110
Day	Fri
Local Time Of Day	0001 To 0600
Place
Locale Reference	atc facility : lit
State Reference	AR
Altitude	msl bound lower : 34500 msl bound upper : 36000
Environment
Flight Conditions	Mixed
Light	Night
Aircraft 1
Controlling Facilities	artcc : zme
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 3 Turbojet Eng
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : atp pilot : cfi pilot : commercial pilot : flight engineer
Experience	flight time last 90 days : 200 flight time total : 14000 flight time type : 3000
ASRS Report	192060
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : commercial pilot : instrument
Events
Anomaly	altitude deviation : excursion from assigned altitude inflight encounter : weather inflight encounter other other anomaly other
Independent Detector	other flight crewa
Resolutory Action	none taken : insufficient time none taken : detected after the fact
Consequence	Other
Supplementary
Primary Problem	Weather
Air Traffic Incident	other

Narrative:

Out flight from ord to iah was late due to a line of thunderstorms which passed through ord. We took off and climbed to 35000. The flight was mostly smooth. The front had passed through our area of flight and we stayed in VMC conditions. An area of severe turbulence was encountered which caused the large transport aircraft to descend 500 ft and then climb 1000 ft. We were on autoplt at the time and the radar was clear with no echoes. The turbulence lasted approximately 30 seconds. A call came from the aircraft aft interphone that 1 of our flight attendants was injured. Center told us no turbulence had been reported in our area. We proceeded to iah with only occasionally moderate turbulence. I don't see how this could have been avoided. The radar showed no echoes and being dark, it was difficult to see outside for thunderstorm tops.

Original NASA ASRS Text

Title: FLC OF LGT AT FL350 HAD SEVERE TURB 500 DOWN TO 1000 UP. CABIN ATTENDANT INJURED.

Narrative: OUT FLT FROM ORD TO IAH WAS LATE DUE TO A LINE OF TSTMS WHICH PASSED THROUGH ORD. WE TOOK OFF AND CLBED TO 35000. THE FLT WAS MOSTLY SMOOTH. THE FRONT HAD PASSED THROUGH OUR AREA OF FLT AND WE STAYED IN VMC CONDITIONS. AN AREA OF SEVERE TURB WAS ENCOUNTERED WHICH CAUSED THE LGT ACFT TO DSND 500 FT AND THEN CLB 1000 FT. WE WERE ON AUTOPLT AT THE TIME AND THE RADAR WAS CLR WITH NO ECHOES. THE TURB LASTED APPROX 30 SECONDS. A CALL CAME FROM THE ACFT AFT INTERPHONE THAT 1 OF OUR FLT ATTENDANTS WAS INJURED. CENTER TOLD US NO TURB HAD BEEN RPTED IN OUR AREA. WE PROCEEDED TO IAH WITH ONLY OCCASIONALLY MODERATE TURB. I DON'T SEE HOW THIS COULD HAVE BEEN AVOIDED. THE RADAR SHOWED NO ECHOES AND BEING DARK, IT WAS DIFFICULT TO SEE OUTSIDE FOR TSTM TOPS.

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.

Flight crew of large transport at FL350 had severe turbulence 500 down to 1000 up. Cabin attendant injured.