DCA15CA136

NTSB accident investigation · Boeing 777 - 236 · Windsor Locks, CT · May 27, 2015

Accident · Serious injuriesData collectionFinal report
Date
May 27, 2015, 19:33 local (23:33 UTC)
Place
Windsor Locks, CT
Injuries
1 serious, 1 minor, 197 uninjured
Damage
No damage
Phase of flight
Enroute
Aircraft
G-VIIYBoeing 777 - 236
Defining event
Enroute-descent: Turbulence encounter
Weather
Visual (VMC) · Day
Status
Completed · report April 8, 2016
Report
Approved by Office Director
NTSB office
Major Investigations Division
Case key
91392

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

On this page

Probable cause

an inadvertent encounter with convective turbulence resulting in serious injury to a flight attendant.

Findings · 1

NTSB’s coded findings. Those marked are part of the probable cause; the rest are factors or other findings. Under each, the cases with the same finding.

Turbulence: convective turbulenceEnvironmental issues › Conditions/weather/phenomena · Effect on personnelAll aircraft: 145 casesProbable cause

Sequence of events

The events NTSB coded, in order, by phase of flight. The defining event is the one that best describes the accident. Under each, the cases with the same event anywhere in their sequence.

Turbulence encounterEnroute-descentAll aircraft: 423 casesDefining event

Analysis

According to flight crew statements, they could see a line of clouds ahead of the airplane during descent and the flight encountered turbulence soon after entering the clouds. FDR data indicated the airplane was level at 14,000 feet at about 280 knots when there was an approximately 10 second period of fluctuations in both vertical and lateral acceleration. The vertical acceleration fluctuated between about +.426 g's and +1.723 g's and lateral acceleration fluctuated from about +.156 g's to -.211 g's. According to flight attendant (FA) statements, the flight encountered three "jolts" of turbulence about 30 minutes before landing. At the time of the turbulence, one FA was assisting a passenger with a drink in the aft galley. The FA braced herself during the turbulence, however, a passenger standing by the galley fell onto the FAs left lower leg, pinning her to the floor. The FA was assisted into the last row of seats in the cabin where she remained for the rest of the flight and the passenger required assistance to return to her seat. The flight crew indicated that the seatbelt sign was selected on about 5 minutes prior to the turbulence encounter, however, no PA announcement was made. The FAs reported that the seatbelt sign was not turned on until after a FA called the flight deck after the turbulence encounter. The flight crew advised ATC of the injuries and requested paramedics meet the airplane at EWR. The FA was transported to the hospital and diagnosed with two acute fractures of the left fibula.

Factual narrative

According to flight crew statements, they could see a line of clouds ahead of the airplane during descent and the flight encountered turbulence soon after entering the clouds. FDR data indicated the airplane was level at 14,000 feet at about 280 knots when there was an approximately 10 second period of fluctuations in both vertical and lateral acceleration. The vertical acceleration fluctuated between about +.426 g's and +1.723 g's and lateral acceleration fluctuated from about +.156 g's to -.211 g's. According to flight attendant (FA) statements, the flight encountered three "jolts" of turbulence about 30 minutes before landing. At the time of the turbulence, one FA was assisting a passenger with a drink in the aft galley. The FA braced herself during the turbulence, however, a passenger standing by the galley fell onto the FAs left lower leg, pinning her to the floor. The FA was assisted into the last row of seats in the cabin where she remained for the rest of the flight and the passenger required assistance to return to her seat. The flight crew indicated that the seatbelt sign was selected on about 5 minutes prior to the turbulence encounter, however, no PA announcement was made. The FAs reported that the seatbelt sign was not turned on until after a FA called the flight deck after the turbulence encounter. The flight crew advised ATC of the injuries and requested paramedics meet the airplane at EWR. The FA was transported to the hospital and diagnosed with two acute fractures of the left fibula.

Aircraft

Registration
G-VIIY
Reported as
Boeing 777 - 236 (236)
Category
Airplane
Serial number
29967
Built
1999
Airframe hours
70,564
Engines
General Electric GE90-85BG11, 85,000 lbs thrust, turbo fanGeneral Electric GE90-85BG11, 85,000 lbs thrust, turbo fan
Damage
No damage
Flight
Part 129
Operator
British Airways
Registered owner
British Airways
Airworthiness certificate
Standard, Transport
Last inspection
Continuous airworthiness · May 27, 2015
Departed
LHR · London
Destination
EWR · Newark, NJ
Flight plan
IFR

Flight crew · 2

As NTSB recorded them. NTSB leaves out names.

Role
Pilot
Age
45
Injuries
None
Certificates
Flight instructor, Airline transport
Airplane ratings
Multi-engine land
Instrument ratings
Airplane
Medical
Class 1, With waivers/limitations
Last flight review
April 12, 2015
Seat
Left
Flight hours
11,240 total · 7,200 in this make and model · 2,921 as pilot in command · 166 in the last 90 days · 58 in the last 30 days · 0 in the last 24 hours
Role
Co-pilot
Age
36
Injuries
None
Certificate
Airline transport
Airplane ratings
Multi-engine land
Instrument ratings
Airplane
Medical
Class 1, With waivers/limitations
Last flight review
May 10, 2015
Seat
Right
Flight hours
3,640 total · 140 in this make and model

Weather

Conditions
Visual (VMC) · Day
Wind
180° at 8 knots
Visibility
10 statute miles
Lowest ceiling
2,700 ft broken
Temperature
75 °F, dew point 64 °F
Altimeter
30.12 inHg
Turbulence
Unknown
Observed at
KBDL, 3 nm away

Docket · 3

The files NTSB released with the investigation on April 8, 2016, on NTSB’s docket system: statements, records, photos and specialists’ reports. 3.4 MB in all.