NTSB Identification: MIA03LA067.
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Scheduled 14 CFR AMERICAN AIRLINES INC
Accident occurred Tuesday, February 25, 2003 in Miami, FL
Probable Cause Approval Date: 10/28/2004
Aircraft: Boeing 777-223, registration: N790AN
Injuries: 2 Serious,131 Uninjured.
NTSB investigators may not have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.
While descending into Miami, the flight crew began deviating "well" south of a few small cumulous developments. They had begun reducing speed to turbulence penetration "prior to encountering a few pockets of light chop at about FL240." The captain gave a "PA to the FA'S and passengers leaving FL180, asking that the cabin be prepared for landing early, due to possible chop during our approach." They encountered a very brief pocket of moderate chop. The seatbelt sign was on, the cabin crew was in the process of securing the cabin for landing, and the purser had made the announcement for passengers to prepare for landing right after the captain's pre-landing announcement. Several minutes after the event, the number one flight attendant, advised the captain that two of the flight attendants in the aft part of the airplane had been injured during the turbulence event. A convective SIGMET was valid for Florida and coastal waters at the time of the turbulence encounter. Radar images from the Miami Weather Surveillance Radar (WSR-88D) identified multiple storm cells in the area at the time of the turbulence encounter. The radar data indicated that the core intensity of these cells was strong to intense (40 to 50 dBZ). A radar image taken about the time of the turbulence encounter shows the airplanes path came about five nautical miles from the core of one cell and three nautical miles from the core of a second cell. During this event, the airplane experienced a 2.04 g vertical acceleration load, 6 degree of left roll and a pitch change from -0.4 degrees to -2.1 degrees.
The National Transportation Safety Board determines the probable cause(s) of this accident to be: The flight crew's inadvertent encounter with turbulence while attempting to maneuver through an area of convective activity during descent. Full narrative available
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