ATL91LA123

NTSB accident investigation · Boeing 757-232 · Alma, GA · July 4, 1991

Accident · Serious injuriesLimited investigationFinal report
Date
July 4, 1991, 12:07 local (16:07 UTC)
Place
Alma, GA
Injuries
1 serious, 124 uninjured
Damage
No damage
Phase of flight
Enroute
Aircraft
N605DLBoeing 757-232
Weather
Instrument (IMC) · Day
Status
Completed · report September 30, 1992
Report
Approved by Office Director
FAA report
19910704030619A
Case key
8428

From the NTSB’s public API. By law, NTSB reports can’t be used as evidence in lawsuits over the accident.

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Probable cause

Turbulence in clouds, which was associated with a dissipating thunderstorm.

Sequence of events

NTSB’s coding before 2008: each occurrence and phase of flight, and the causes and factors under it. The codes are defined in NTSB’s coding manual.

In flight encounter with weatherCruise - normal
Weather condition - turbulence in cloudsFactor
Weather condition - thunderstormCause
Remedial action - not possible

Analysis

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.

Aircraft

Registration
N605DL
Reported as
Boeing 757-232
Category
Airplane
Serial number
22812
Engine
P&W 2037, 37,500 lbs thrust, turbo fan
Damage
No damage
Flight
Part 121
Operator
Delta Air Lines
Registered owner
Delta Air Lines
Last inspection
Unknown · January 2, 2000
Departed
MCO · Orlando, FL
Destination
ATL · Atlanta, GA
Flight plan
IFR

Matched to the registry by N-number and the event date; the registry’s history has gaps, so older matches can be wrong. Compare the reported make and model.

Flight crew

As NTSB recorded them. NTSB leaves out names.

Role
Pilot
Age
50
Certificate
Airline transport
Airplane ratings
Multi-engine land
Instrument ratings
Airplane
Medical
Class 1, Valid Medical--w/ waivers/lim
Seat
Left
Flight hours
15,550 total · 65 in this make and model

Weather

Conditions
Instrument (IMC) · Day
Visibility
7 statute miles
Lowest ceiling
10,000 ft overcast
Temperature
-0 °F, dew point -0 °F
Observed at
VAD, 49 nm away

FAA reports on this event · 1

The FAA’s own accident and incident reports, matched to the aircraft by N-number and date.