NTSB Identification: MIA90LA058.
The docket is stored on NTSB microfiche number 42344.
Scheduled 14 CFR AMERICAN AIRLINES
Accident occurred Saturday, January 20, 1990 in SAN JUAN
Probable Cause Approval Date: 11/09/1992
Aircraft: MCDONNELL DOUGLAS DC-10-10, registration: N124AA
Injuries: 2 Serious,45 Minor,100 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.

THE AIRPLANE WAS IN A NORMAL DESCENT FROM FL370 IN PREPARATION FOR ARRIVAL AT THE DESTINATION. AS THE DESCENT CONTINUED THROUGH FL 230 THE FLIGHT EXPERIENCED 2 TURBULENCE EVENTS AND 2 PASSENGERS RECEIVED SERIOUS INJURIES AND 37 PASSENGERS AND 8 FLIGHT ATTENDANTS RECEIVED MINOR INJURIES. THE FLIGHT WAS OPERATING ON A MOONLESS NIGHT AND THE WEATHER AVOIDANCE RADAR WAS ON BUT NOTHING WAS OBSERVED ON THE RADAR.

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

INADVERTENT FLIGHT OF THE AIRPLANE INTO AN AREA OF TURBULENCE ASSOCIATED WITH A DEVELOPING RAIN STORM.

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