NTSB Identification: ATL91LA123.
The docket is stored on NTSB microfiche number 45069.
Scheduled 14 CFR operation of DELTA AIR LINES
Accident occurred Thursday, July 04, 1991 in ALMA, GA
Probable Cause Approval Date: 09/30/1992
Aircraft: BOEING 757-232, registration: N605DL
Injuries: 1 Serious,124 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 PILOTS REPORTED THAT THEY WERE DEVIATING AROUND TWO THUNDERSTORM CELLS LOCATED 20 TO 25 MILES EAST OF THEIR POSITION. AS THEY CAME OUT OF THE BOTTOM OF A CIRRUS LAYER, THEY OBSERVED A DISSIPATING CUMULUS CLOUD IN THEIR FLIGHT PATH. THIS CLOUD WAS NOT OBSERVED ON THEIR WEATHER RADAR, AND AVOIDANCE WOULD HAVE REQUIRED AN ABRUPT, VIOLENT MANEUVER. THE FLIGHT CREW ACTIVATED THE SEAT BELT SIGN JUST PRIOR TO CLOUD PENETRATION. THE FLIGHT EXPERIENCED A TURBULENCE EPISODE OF ABOUT FOUR SECONDS IN DURATION. A FEMALE PASSENGER, WHO WAS ENTERING THE LAVATORY AT THE TIME CAUGHT HER FOOT IN THE LAVATORY DOOR, BREAKING HER ANKLE.

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

TURBULENCE IN CLOUDS, WHICH WAS ASSOCIATED WITH A DISSIPATING THUNDERSTORM.

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