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| Date: | Thursday 1 December 2011 |
| Time: | 13:39 |
| Type: |  Boeing 757-222 |
| Owner/operator: | United Airlines |
| Registration: | N547UA |
| MSN: | 25368/414 |
| Year of manufacture: | 1991 |
| Total airframe hrs: | 74780 hours |
| Engine model: | P & W PW2040 |
| Fatalities: | Fatalities: 0 / Occupants: 152 |
| Aircraft damage: | None |
| Category: | Accident |
| Location: | Modesto Three STAR, ELCAP intersection, Yosemite Nat\'l Park, CA -
 United States of America
|
| Phase: | Approach |
| Nature: | Passenger - Scheduled |
| Departure airport: | Denver International Airport, CO (DEN/KDEN) |
| San Francisco, CA (SFO) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
While en route at flight level (FL) 360, the captain of the commercial air carrier flight requested and was granted a lower altitude (FL 300) to minimize the effect that turbulence was having on the airplane. After the captain received pilot reports indicating that varying degrees of turbulence, mountain wave activity, and low-level windshear existed, he illuminated the seat belt sign and made an announcement for the passengers to be seated. The flight crew then advised the cabin crewmembers of possible turbulence and instructed them to prepare the cabin for landing, stay near their seats, and be seated immediately if turbulence was encountered. About 7 to 10 minutes later, while the airplane was at FL 300, the flight encountered moderate-to-severe turbulence. A flight attendant who was in the lavatory when the turbulence was encountered sustained a broken ankle after being thrown in the air twice.
Probable Cause: The flight's encounter with known severe turbulence associated with mountain wave activity, which resulted in a flight attendant sustaining a broken ankle.
Accident investigation:
 |
|
Sources:
NTSB
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 19-Dec-2011 09:12 | Geno | Added |
| 21-Dec-2016 19:26 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 27-Nov-2017 17:39 | ASN Update Bot | Updated [Operator, Other fatalities, Departure airport, Destination airport, Source, Narrative] |
Corrections or additions? ... Edit this accident description
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