NTSB Identification: FTW83IA072
Nonscheduled 14 CFR Part 121: Air Carrier operation of AMERICAN AIRLINES, INC.
Incident occurred Thursday, December 30, 1982 in THERMAL, CA
Probable Cause Approval Date: 12/30/1983
Aircraft: MCDONNELL-DOUGLAS DC-10-30, registration: N137AA
Injuries: 14 Minor,203 Uninjured.

NTSB investigators used data provided by various sources and may not have traveled in support of this investigation to prepare this aircraft incident report.

AT ABOUT 1458 PST, THE AIRCRAFT ENCOUNTERED MODERATE TO SEVERE CLEAR AIR TURBULENCE FOR A PERIOD OF 8 TO 10 SECONDS WHILE CLIMBING THROUGH 35,500 FT. SEVEN PASSENGERS AND SEVEN FLIGHT ATTENDANTS RECEIVED MINOR INJURIES. THE SEAT BELT SIGN HAD BEEN TURNED ON BEFORE TAKEOFF AND HAD REMAINED ON THROUGHOUT THE ENCOUNTER. OF THE PASSENGER WHO WERE INJURED, FOUR STATED THEIR SEAT BELTS WERE OFF, TWO STATED THEIR BELTS WERE LOOSE AND ONE HAD DISREGARDED THE SIGN AND WAS IN THE LAVATORY. THE INJURED FLIGHT ATTENDANTS WERE PREPARING FOR CABIN SERVICE AND WERE NOT RESTRAINED. A REVIEW OF THE AIRLINE'S COMPUTER GENERATED FLIGHT PLAN DATA REVEALED THAT THE MAXIMUM GENERATED TURBULENCE INDEX PREDICTED WAS LIGHT. THERE WAS A CAT SIGMET, VALID FOR THE PERIOD, WHICH REPORTED MODERATE TURBULENCE AT FLIGHT LEVEL 360 TO 370 OVER SOUTHERN CALIFORNIA IN THE HECTOR-THERMAL AREA.

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

WEATHER CONDITION..TURBULENCE,CLEAR AIR

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

SEAT BELT..NOT USED..FLIGHT ATTENDANT

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

SEAT BELT..NOT USED..PASSENGER

Index for Dec1982 | Index of months