MIA04LA134

NTSB accident investigation · Boeing 767-232 · Caribbean Sea · September 29, 2004

Accident · Serious injuriesLimited investigationFinal report
Date
September 29, 2004, 13:45 local (17:45 UTC)
Place
Caribbean Sea
Injuries
1 serious, 144 uninjured
Damage
No damage
Phase of flight
Enroute
Aircraft
N109DLBoeing 767-232
Weather
Visual (VMC) · Day
Status
Completed · report September 13, 2005
Report
Approved by Office Director
Parties
FAA International Office, Delta Air Lines, Inc.
Case key
60376

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

An inadvertent encounter with severe turbulence during cruise, which resulted in a flight attendant being injured.

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
Flight into adverse weather - inadvertentPilot in commandCause
Weather condition - turbulence

Analysis

The captain said the seat belt sign was illuminated and he made a public address requesting that passengers stay seated with their seat belts fastened. He said they encountered very brief moderate turbulence and a flight attendant was injured. The first officer/pilot-not-flying stated that prior to the turbulence event the captain had illuminated the seat belt sign, and had made a public address. The first officer also said that he had contacted the flight attendants and told them to stay seated. He said he then requested and received clearance to deviate around known weather ahead of their flight path. He said they did not penetrate any weather as seen on the airplane's display, but that they were in instrument meteorological conditions, and returned to visual meteorological conditions momentarily, after which another cloud was in front of them, but there was no precipitation associated with it on the radar display. He said there was not enough time to maneuver, and they were within the cloud for about 5 seconds at which time the turbulence occurred. One flight attendant stated that the time between the captain's announcement and the actual turbulence was a mere few seconds. A second flight attendant stated that she along with two other flight attendants were in the aft galley when the seat belt light was turned on to indicate initial approach when about 20 minutes away from Aruba. She further stated that there was normal light chop as they prepared the galley for landing. The second flight attendant said that the passengers were seated, when suddenly they encountered severe turbulence and the airplane dropped and jolted several times. A third flight attendant said that approximately 100 miles out from Aruba the captain turned on the seat belt sign and asked every one to be seated. She said the two flight attendants in the back were cleaning and stowing catering items and were not seated. Examination of the flight data recorder showed multiple vertical acceleration cycles between about positive 1.8 and 0.0 Gs, associated with the event.

Factual narrative

On September 29, 2004, about 1345 eastern daylight time, a Boeing 767-232, N109DL, registered to and operated by Delta Air Lines Inc., as a Title 14 CFR Part 121 scheduled international air carrier passenger flight from Atlanta, Georgia, to Aruba, Netherlands Antilles, had an encounter with turbulence, while over the Caribbean Sea. Visual meteorological conditions prevailed, and an instrument flight rules flight plan was filed. The airline transport-rated pilot, first officer, 4 flight attendants, and 138 passengers were not injured. One flight attendant was seriously injured, and the airplane was not damaged. The flight originated in Atlanta, Georgia, the same day, about 1029.

The captain stated that at the time of the accident they were in cruise flight at FL 370, in instrument meteorological conditions. He said they were about 130 miles north of Aruba, and the seat belt sign was illuminated, and in addition, he had made a public address informing the passengers of light choppy turbulence, and requested they stay seated with their seat belts securely fastened. He further stated that they then encountered very brief moderate turbulence, of about a 3-second duration, after which he called back to the cabin, and was told that a flight attendant had been injured.

The first officer stated that he was the pilot-not-flying, and that prior to the turbulence event the captain had illuminated the seat belt sign, and had made a public address. The first officer said that he contacted the flight attendants via the interphone and told them that they should stay seated for a while. He said he then requested and received clearance to deviate around known weather ahead of their flight path. The first officer said that they did not penetrate any weather as seen on the airplane's display, but that they were in instrument meteorological conditions, and did not encounter turbulence. He said they returned to visual meteorological conditions momentarily, and then another cloud was in front of them , but there was no precipitation associated with that cloud on the radar display. He said there did not appear to be enough time to maneuver around this cloud, and was within the cloud for about 5 seconds at which time the turbulence occurred. He said they then received a call on the interphone that a flight attendant was in the aisle and appeared to be injured.

One flight attendant stated that they were about 100 miles from landing the airplane encountered turbulence so strong that the cart in the aft galley toppled and injuries were suffered by three flight attendants. The flight attendant further stated that the time between the captains announcement to everyone to sit down and the actual turbulence was a mere few seconds.

A second flight attendant stated that she along with two other flight attendants were in the aft galley when the seat belt light was turned on to indicate initial approach when about 20 minutes away from Aruba. She further stated that there was normal light chop as they prepared the galley for landing. In addition, all passengers were seated, when suddenly they encountered severe turbulence and the airplane dropped suddenly and jolted several times. She said that the other two flight attendants were thrown toward the 2 left door, and she was thrown to the 2 right door.

A third flight attendant said that approximately 100 miles out from Aruba the captain turned on the seat belt sign and asked every one to be seated. She said the two flight attendants in the back were cleaning and stowing catering items and were not seated.

Examination of the flight data recorder showed multiple vertical acceleration cycles between about positive 1.8 and 0.0 Gs, associated with the event.

Aircraft

Registration
N109DL
Reported as
Boeing 767-232
Category
Airplane
Serial number
22221
Airframe hours
67,045.5
Engines
General Electric CF6-80A2, 48,000 lbs thrust, turbo fanGeneral Electric CF6-80A2, 48,000 lbs thrust, turbo fan
Damage
No damage
Flight
Part 121
Registered owner
Delta Air Lines Inc.
Airworthiness certificate
Standard, Transport
Last inspection
Continuous airworthiness · August 1, 2004
Departed
KATL · Atlanta, GA
Destination
TNCA · Oranjestad
Flight plan
IFR
Airport
AUA · Aruba, Netherlands Antilles

Flight crew · 2

As NTSB recorded them. NTSB leaves out names.

Role
Pilot
Age
47
Injuries
None
Certificates
Airline transport, Flight engineer
Airplane ratings
Multi-engine land
Instrument ratings
Airplane
Medical
Class 1, Valid Medical--no waivers/lim.
Last flight review
September 1, 2004
Seat
Left
Flight hours
5,924 total · 4,087 in this make and model · 221 in the last 90 days · 3 in the last 24 hours
Role
Co-pilot
Age
40
Injuries
None
Certificates
Flight engineer, Airline transport
Airplane ratings
Multi-engine land
Instrument ratings
Airplane
Medical
Class 1, Valid Medical--no waivers/lim.
Last flight review
May 1, 2004
Seat
Right
Flight hours
5,393 total · 1,167 in this make and model · 170 in the last 90 days · 3 in the last 24 hours

Weather

Conditions
Visual (VMC) · Day
Wind
70° at 11 knots
Visibility
10 statute miles
Lowest ceiling
30,000 ft overcast
Temperature
88 °F, dew point 75 °F
Altimeter
29.77 inHg
Observed at
TNCA