What happened
On February 23, 2008, a Boeing 737-700, operating as N551WN, was flying at 30,000 feet on the PIGLT1 arrival to Orlando International Airport (MCO). During the flight, the aircraft encountered unexpected turbulence that the pilot flying described as being at least moderate in intensity. The turbulence lasted approximately 10 seconds.
At the time of the encounter, the autopilot was engaged, the seat belt sign was illuminated, and flight attendants were in the process of securing the cabin for landing. During the turbulence, one flight attendant was thrown against a wall, resulting in 1 serious injury (a fractured ankle). The aircraft subsequently landed at MCO without further incident.
Weather
The weather conditions at the time of the event were Instrument Meteorological Conditions (IMC) with visibility of 10 statute miles.