NTSB Identification: CHI99LA145.
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Scheduled 14 CFR operation of VANGUARD AIRLINES
Accident occurred Wednesday, May 05, 1999 in CHICAGO, IL
Probable Cause Approval Date: 06/21/2000
Aircraft: Boeing 737-222, registration: N208AU
Injuries: 1 Serious,47 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.

Flight 432 encountered about 30 seconds of moderate turbulence while deviating around weather cells during a descent from 17,000 feet mean sea level (msl). The seat belt sign was on and the flight attendants were instructed to be seated prior to the encounter. The 'A' flight attendant in the front of the airplane was able to get to her jumpseat. The 'B' and 'C' flight attendants in the back of the airplane were not seated and both were thrown to the ceiling during the encounter. The 'B' flight attendant suffered a cut and bruises. The 'C' flight attendant who landed on the floor suffered a broken pelvis.

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

the flight attendants did not follow the cockpit crews instructions to be seated because of expected turbulence. A factor associated with the accident was the turbulence encountered.

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