DCA16CA026

NTSB accident investigation · Boeing 737 7H4 · St Louis, MO · November 29, 2015

Accident · Serious injuriesData collectionFinal report
Date
November 29, 2015, 17:15 local (22:15 UTC)
Place
St Louis, MO
Injuries
1 serious, 147 uninjured
Damage
No damage
Phase of flight
Enroute
Aircraft
N467WNBoeing 737 7H4
Defining event
Enroute-descent: Turbulence encounter
Weather
Instrument (IMC) · Day
Status
Completed · report April 20, 2016
Report
Approved by Office Director
NTSB office
Major Investigations Division
Case key
92381

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 clear air turbulence.

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: clear air turbulenceEnvironmental issues › Conditions/weather/phenomena · Effect on personnelBoeing 737-7H4: 7 casesAll aircraft: 78 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.

Analysis

On November 29, 2015, at 5:15pm central standard time, Southwest Airlines flight 145, a Boeing 737-700, N467WN, encountered severe turbulence on descent to St. Louis Lambert International Airport (STL), St. Louis, Missouri. The airplane was descending between flight level 210 and flight level 180 with the seatbelt light illuminated. The flight attendants (FA) were completing cabin service, and the two FA's in the aft cabin fell, one experiencing a broken right foot and leg. None of the passengers were injured and the airplane was not damaged. The airplane was on a regularly scheduled passenger flight from Dallas Love Field (DAL).

Factual narrative

On November 29, 2015, at 5:15pm central standard time, Southwest Airlines flight 145, a Boeing 737-700, N467WN, encountered severe turbulence on descent to St. Louis Lambert International Airport (STL), St. Louis, Missouri. The airplane was descending between flight level 210 and flight level 180 with the seatbelt light illuminated. The flight attendants (FA) were completing cabin service, and the two FA's in the aft cabin fell, one experiencing a broken right foot and leg. None of the passengers were injured and the airplane was not damaged. The airplane was on a regularly scheduled passenger flight from Dallas Love Field (DAL).

Aircraft

Registration
N467WN
Reported as
Boeing 737 7H4 (7H4)
Category
Airplane
Serial number
33830
Built
2004
Airframe hours
41,478
Engines
CFM Intl. CFM56 SERIES, turbo fanCFM Intl. CFM56 SERIES, turbo fan
Damage
No damage
Flight
Part 121
Operator
Southwest Airlines Co
Registered owner
Southwest Airlines Co
Airworthiness certificate
Standard, Commuter; Standard, Transport; Standard, Normal
Departed
KDAL · Dallas, TX
Destination
KSTL · St. Louis, MO
Flight plan
IFR
Airport
KSTL · Lambert
Equipment
Electronic flight bag or handheld device, Data recorder, Electronic multifunction display, Angle of attack indicator, Stall warning system, Onboard weather, Heads up display, Electronic primary flight display

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 · 2

As NTSB recorded them. NTSB leaves out names.

Role
Pilot
Age
45
Injuries
None
Certificate
Airline transport
Airplane ratings
Multi-engine land
Instrument ratings
Airplane
Medical
Class 1, Without waivers/limitations
Last flight review
February 25, 2015
Seat
Left
Restraint
3-point
Flight hours
16,300 total · 12,400 in this make and model · 7,000 as pilot in command · 225 in the last 90 days · 120 in the last 30 days · 5 in the last 24 hours
Role
Co-pilot
Age
41
Injuries
None
Certificates
Airline transport, Commercial
Airplane ratings
Multi-engine land, Single-engine land
Instrument ratings
Airplane
Medical
Class 1, With waivers/limitations
Last flight review
March 18, 2015
Seat
Right
Restraint
Lap only
Flight hours
10,340 total · 3,869 in this make and model · 4,074 as pilot in command · 145 in the last 90 days · 45 in the last 30 days · 8 in the last 24 hours

Weather

Conditions
Instrument (IMC) · Day
Wind
20° at 6 knots
Visibility
7 statute miles
Lowest ceiling
1,400 ft overcast
Temperature
41 °F, dew point 36 °F
Altimeter
30.20 inHg
Icing
Unknown
Turbulence
Severe
Observed at
KSTL, 54 nm away

Docket · 3

The files NTSB released with the investigation on July 21, 2021, on NTSB’s docket system: statements, records, photos and specialists’ reports.