DCA16CA214

NTSB accident investigation · Boeing 737 924 · Waco, TX · August 17, 2016

Accident · Serious injuriesData collectionFinal report
Date
August 17, 2016, 12:15 local (16:15 UTC)
Place
Waco, TX
Injuries
1 serious, 141 uninjured
Damage
No damage
Phase of flight
Enroute
Aircraft
N37408Boeing 737 924
Defining event
Enroute-descent: Turbulence encounter
Weather
Visual (VMC) · Day
Status
Completed · report June 8, 2020
Report
Approved by Office Director
NTSB office
Major Investigations Division
FAA report
20160817009019A
Case key
93864

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 encounter with convective 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: convective turbulenceEnvironmental issues › Conditions/weather/phenomena · Effect on personnelBoeing 737-924: 1 caseAll 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.

Analysis

On August 17, 2016, about 1215 central daylight time, United Airlines flight 1945, a Boeing 737-924, N37408, encountered moderate turbulence near Waco, Texas, while on the approach to land at George Bush Intercontinental Airport (KIAH), Houston, Texas. Of the 142 passengers and crew onboard, one flight attendant received a serious injury. The airplane was not damaged. The flight was operating under the provision of 14 CFR Part 121 as a scheduled domestic passenger flight from Seattle-Takoma International Airport (KSEA), Seattle, Washington. The captain was the pilot monitoring, and the first officer the pilot flying. About 40 minutes from landing, the captain called the cabin and asked the flight attendants to prepare the cabin early and be seated because he anticipated light chop/turbulence. As the flight was descending from FL330 feet to FL240 on the GUSHR2 RNAV arrival the airplane and was in and out of cumulus and stratus clouds. The seatbelt sign was illuminated, and the weather radar was on but there were no indications of turbulence depicted in front of the airplane, though the crew could see that the weather was building rather than dissipating with scattered cumulus clouds all around. As the flight entered one small cloud, the airplane encountered a very brief duration of moderate turbulence. The autopilot did not disengage. Shortly after, they received a call from the cabin informing them that one of the flight attendants had been injured. At the time of the turbulence, the flight attendants (FA) were finishing their passenger compliance checks and securing the galleys. One of the aft FAs was in the process of securing the final latches in the galley when she was tossed about the galley, seriously injuring her right ankle. The other FAs assisted with stabilizing her and the flight landed without further incident. Paramedics met the airplane at the gate and the FA was transported to the hospital where she was diagnosed with a broken ankle.

Factual narrative

On August 17, 2016, about 1215 central daylight time, United Airlines flight 1945, a Boeing 737-924, N37408, encountered moderate turbulence near Waco, Texas, while on the approach to land at George Bush Intercontinental Airport (KIAH), Houston, Texas. Of the 142 passengers and crew onboard, one flight attendant received a serious injury. The airplane was not damaged. The flight was operating under the provision of 14 CFR Part 121 as a scheduled domestic passenger flight from Seattle-Takoma International Airport (KSEA), Seattle, Washington. The captain was the pilot monitoring, and the first officer the pilot flying. About 40 minutes from landing, the captain called the cabin and asked the flight attendants to prepare the cabin early and be seated because he anticipated light chop/turbulence. As the flight was descending from FL330 feet to FL240 on the GUSHR2 RNAV arrival the airplane and was in and out of cumulus and stratus clouds. The seatbelt sign was illuminated, and the weather radar was on but there were no indications of turbulence depicted in front of the airplane, though the crew could see that the weather was building rather than dissipating with scattered cumulus clouds all around. As the flight entered one small cloud, the airplane encountered a very brief duration of moderate turbulence. The autopilot did not disengage. Shortly after, they received a call from the cabin informing them that one of the flight attendants had been injured. At the time of the turbulence, the flight attendants (FA) were finishing their passenger compliance checks and securing the galleys. One of the aft FAs was in the process of securing the final latches in the galley when she was tossed about the galley, seriously injuring her right ankle. The other FAs assisted with stabilizing her and the flight landed without further incident. Paramedics met the airplane at the gate and the FA was transported to the hospital where she was diagnosed with a broken ankle.

Aircraft

Registration
N37408
Reported as
Boeing 737 924 (924)
Category
Airplane
Serial number
30125
Built
2001
Engines
CFM Intl. CFM56 SERIES, turbo fanCFM Intl. CFM56 SERIES, turbo fan
Damage
No damage
Flight
Part 121
Operator
United Airlines
Registered owner
Wells Fargo Bank Northwest Na Trustee
Airworthiness certificate
Standard, Transport
Departed
KSEA · Seattle, WA
Destination
KIAH · Houston, TX
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 · 2

As NTSB recorded them. NTSB leaves out names.

Role
Pilot
Age
58
Injuries
None
Certificate
Airline transport
Airplane ratings
Single-engine land, Multi-engine land
Instrument ratings
Airplane
Medical
Class 1, Waiver time limited special
Last flight review
June 24, 2016
Seat
Left
Restraint
5-point
Flight hours
25,000 total · 11,297 in this make and model
Role
Co-pilot
Age
47
Injuries
None
Certificate
Airline transport
Airplane ratings
Single-engine land, Multi-engine land
Instrument ratings
Airplane
Medical
Class 1, Without waivers/limitations
Last flight review
December 23, 2015
Seat
Right
Restraint
5-point
Flight hours
16,000 total · 8,500 in this make and model · 218 in the last 90 days · 59 in the last 30 days · 6 in the last 24 hours

Weather

Conditions
Visual (VMC) · Day

Docket · 17

The files NTSB released with the investigation on June 29, 2020, on NTSB’s docket system: statements, records, photos and specialists’ reports.

FAA reports on this event · 1

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