Friday, February 24, 2017

United Airlines, Boeing 737-824, N24202: Accident occurred December 13, 2016 near Denver International Airport (KDEN), Colorado

Aviation Accident Final Report - National Transportation Safety Board:

Docket And Docket Items - National Transportation Safety Board:

NTSB Identification: DCA17CA042
Scheduled 14 CFR Part 121: Air Carrier operation of United Airlines
Accident occurred Tuesday, December 13, 2016 in Denver, CO
Probable Cause Approval Date: 02/23/2017
Aircraft: BOEING 737 824, registration: N24202
Injuries: 1 Serious, 173 Uninjured.

NTSB investigators used data provided by various entities, including, but not limited to, the Federal Aviation Administration and/or the operator and did not travel in support of this investigation to prepare this aircraft accident report.

On December 13, 2016, at 1847 mountain standard eastern daylight time, United Airlines flight 1545, a Boeing 737-800, N24202, experienced turbulence during descent that resulted in one flight attendant sustaining a serious injury. There were no injuries to the other passengers and crew onboard and the airplane was not damaged. The flight was operating under the provisions of 14 Code of Federal Regulations Part 121 as a regularly scheduled passenger flight from San Francisco International Airport (SFO), California to Denver International Airport (DEN), Colorado. The flight landed at DEN with no further incident.

According to the operator, weather forecasts indicated that mountain wave turbulence was expected over the Sierra Nevada mountains and moderate turbulence was forecast for the descent in to DEN below 17,000 feet. As the airplane descended through approximately FL270 the captain advised the flight attendants "it's going to get bumpy" and to be seated.

The flight crew reported that passing through approximately FL220 the airplane experienced increasing turbulence and then at about FL200 experienced a "big jolt." The flight attendant in position 2L was securing the galley at the time of the turbulence and was thrown to the ceiling and then struck her face on the galley counter while falling to the floor. She suffered multiple injuries including a large gash to her cheek and a fractured facial bone.

The National Transportation Safety Board determines the probable cause(s) of this accident as follows:
An inadvertent encounter with mountain wave turbulence.

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