NTSB Identification: MIA88FA032.
The docket is stored on NTSB microfiche number 35912.
Scheduled 14 CFR operation of PAN AMERICAN WORLD AIRWAYS (D.B.A. PAN AM )
Accident occurred Wednesday, November 11, 1987 in ATLANTIC OCEAN
Probable Cause Approval Date: 03/31/1989
Aircraft: Airbus Industrie A310, registration: N813PA
Injuries: 3 Serious,32 Minor,105 Uninjured.

NTSB investigators either traveled in support of this investigation or conducted a significant amount of investigative work without any travel, and used data obtained from various sources to prepare this aircraft accident report.

THE CAPT SAID HE EXPECTED SOME WX DRG THE 1ST 2 HRS OF FLT. AFTER LVLG AT FL 330, THE ACFT WAS IN CLEAR WX, BUT LGT TURBC CONTD FOR A TIME. AFTER THE TURBC HAD STOPPED & THERE WERE NO WX RTRNS ON THE RADAR, THE SEAT BELT SIGN WAS TURNED OFF, ALTHOUGH THE CAPT SUGGESTED TO THE PAX THAT THEY KEEP THEIR SEAT BELTS FASTENED. ABOUT 15 MINUTES LATER (APRX 2 HR & 6 MIN AFTER TKOF), THE ACFT ENCTRD SVR CLEAR AIR TURBC (CAT) W/O WARNING. SUBSEQUENTLY, IT PITCHED, THE AUTO-PLT DISCONNECTED & 35 OCCUPANTS WERE INJURED. THREE PAX WERE SERIOUSLY INJURED; 25 PAX & 7 FLT ATTENDANTS RCVD MINOR INJURIES. THE FLT THEN DIVERTED TO MIAMI WHERE THE INJURED WERE TREATED. A WX STUDY SHOWED THE TURBC WAS ENCTRD NEAR THE EDGE OF THE JET STREAM WHERE THE ACFT HAD CROSSED ABOUT 6000' OVER A CELL (OR GROUP OF CELLS). WINDS AT THAT POINT WERE ESTD TO BE FROM 260 DEG AT ABOUT 55 KTS. MODERATE TO SVR TURBC WAS FORECAST NEAR RAIN SHOWERS &/OR TSTMS.

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

WEATHER CONDITION..TURBULENCE,CLEAR AIR


Contributing Factors

LIGHT CONDITION..DARK NIGHT



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