# NTSB Accident WPR12LA057
> **BOEING 757-222** · 2011-12-01 · Modesto, CA, USA · SERS
## Event
- **NTSB number:** WPR12LA057
- **Event ID:** 20111208X41332
- **Type:** Accident
- **Date:** 2011-12-01
- **Location:** Modesto, CA, USA
- **Coordinates:** 37.610408, -122.379005
## Injuries
- **Highest injury:** SERS
- **Fatal:** 0
- **Serious:** 1
- **Minor:** 0
- **Uninjured:** 151
- **Total aboard:** 152
## Aircraft
- **Make:** BOEING
- **Model:** 757-222
- **Registration:** N547UA
- **FAR Part:** 121
- **Engines:** 2
- **Damage:** —
## Conditions
- **Light:** DAYL
- **Weather:** VMC
## 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.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=WPR12LA057) · AI Analytics · CC0 1.0*