NTSB Identification: CHI00LA268.
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Scheduled 14 CFR (D.B.A. AMERICAN AIRLINES )
Accident occurred Tuesday, August 22, 2000 in BARABOO, WI
Probable Cause Approval Date: 12/18/2001
Aircraft: Boeing 777-223, registration: N785AN
Injuries: 1 Serious,250 Uninjured.
NTSB investigators may have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.
A flight attendant received a broken bone in her foot when the airplane unexpectedly encountered turbulence. The flight was between FL260 and FL240 in a descent to FL190 and the seat belt sign was on when the turbulence was encountered. The captain reported they were in instrument meteorological conditions and the radar was indicating cells to the west of their course, but not along their flight path. He reported there was a downdraft followed by an updraft and that the bank angles did not exceed 30 degrees. The first officer reported the radar was indicating only light precipitation in the area of the encounter.
The National Transportation Safety Board determines the probable cause(s) of this accident to be: the unexpected turbulence encountered by the airplane. Full narrative available
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