Narrative:

In cruise FL260, airspeed 280 KTS, assigned over sby, md. Nose pitched up, autoplt began to trim down. Aircraft climbed approximately 150 ft then dropped approximately 500-600 ft in severe turbulence. Seat belt sign was on at time of incident. Contacted ATC for lower altitude and began descent to FL220. Severe turbulence ended in approximately 30 seconds below FL253. First officer made severe turbulence PIREP to ATC, communicated with cabin attendants to establish any injuries in rear. Was notified 'B' flight attendant in galley had struck her knee on floor of rear galley. An emergency was not declared, but priority handling was requested to ATC and granted for direct to ric where emt met the aircraft and removed our 'B' flight attendant to hospital for medical determination. It was determined at the hospital she had broken her knee.

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Original NASA ASRS Text

Title: A B737-200 ACR FLC ENCOUNTERS SEVERE TURB AT FL260 AND 1 CABIN ATTENDANT IS INJURED. THE FLT CONTINUED TO RIC WHERE THE CABIN ATTENDANT WAS HOSPITALIZED.

Narrative: IN CRUISE FL260, AIRSPD 280 KTS, ASSIGNED OVER SBY, MD. NOSE PITCHED UP, AUTOPLT BEGAN TO TRIM DOWN. ACFT CLBED APPROX 150 FT THEN DROPPED APPROX 500-600 FT IN SEVERE TURB. SEAT BELT SIGN WAS ON AT TIME OF INCIDENT. CONTACTED ATC FOR LOWER ALT AND BEGAN DSCNT TO FL220. SEVERE TURB ENDED IN APPROX 30 SECONDS BELOW FL253. FO MADE SEVERE TURB PIREP TO ATC, COMMUNICATED WITH CABIN ATTENDANTS TO ESTABLISH ANY INJURIES IN REAR. WAS NOTIFIED 'B' FLT ATTENDANT IN GALLEY HAD STRUCK HER KNEE ON FLOOR OF REAR GALLEY. AN EMER WAS NOT DECLARED, BUT PRIORITY HANDLING WAS REQUESTED TO ATC AND GRANTED FOR DIRECT TO RIC WHERE EMT MET THE ACFT AND REMOVED OUR 'B' FLT ATTENDANT TO HOSPITAL FOR MEDICAL DETERMINATION. IT WAS DETERMINED AT THE HOSPITAL SHE HAD BROKEN HER KNEE.

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.