Incident Overview

Date: Thursday 1 December 2011
Aircraft Type: Boeing 737-7H4
Owner/operator: Southwest Airlines
Registration Number: N261WN
Location: over Yosemite National Park, CA – ÿ United States of America
Phase of Flight: En route
Casualties: Fatalities: 0 / Occupants: 100
Component Affected: Flight CrewFlight Crew
Investigating Agency: NTSBNTSB
Category: Accident
A flight experienced severe turbulence during a transition through an area known for turbulence, resulting in a cabin crew member sustaining a serious injury. The flight crew requested cabin security prior to the turbulence, and this request coincided with the turbulence event. The flight?s planned descent was not followed, likely due to the turbulence.A flight experienced severe turbulence during a transition through an area known for turbulence, resulting in a cabin crew member sustaining a serious injury. The flight crew requested cabin security prior to the turbulence, and this request coincided with the turbulence event. The flight?s planned descent was not followed, likely due to the turbulence.

Description

The flight was transitioning through an area of known severe turbulence. One of the flight attendants reported that the flight crew asked the cabin crew to secure the cabin early as they expected to encounter turbulence during the descent. Shortly thereafter, the airplane encountered severe turbulence and the flight attendants were thrown about the galley; one sustained a serious injury. The cockpit voice recorder contained audio that was not relevant to the flight (it was likely recorded over by subsequent events), thus it could not be conclusively determined when the flight crew asked the flight attendants to be seated because they could not recall. It is likely that the flight crew?s request for the cabin to be secured was close to the time of the turbulence encounter, since none of the flight attendants had completed securing the service items when the encounter occurred. Synoptic conditions were favorable for mountain wave activity and a significant meteorological information (SIGMET) advisory and airmen?s meteorological information advisories had been issued for turbulence over the region. The flight crew also had an advisory issued from their enhanced weather information systems for severe turbulence. The event occurred in the region that the SIGMET and the advisory for severe turbulence had been issued. According to the filed flight plan, the flight was to descend before entering the advisory area for weather avoidance; however, the planned descent was not followed. Probable Cause: The flight crew?s flight into known severe turbulence associated with mountain wave activity.

Primary Cause

Mountain wave activity and severe turbulence advisory issued for the region.Mountain wave activity and severe turbulence advisory issued for the region.

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