# NTSB Accident WPR09LA371
> **SIKORSKY S-55** · 2009-07-24 · Chelan, WA, USA · NONE
## Event
- **NTSB number:** WPR09LA371
- **Event ID:** 20090727X55233
- **Type:** Accident
- **Date:** 2009-07-24
- **Location:** Chelan, WA, USA
- **Coordinates:** 47.866111, -119.942779
## Injuries
- **Highest injury:** NONE
- **Fatal:** 0
- **Serious:** 0
- **Minor:** 0
- **Uninjured:** 1
- **Total aboard:** 1
## Aircraft
- **Make:** SIKORSKY
- **Model:** S-55
- **Registration:** N1255T
- **FAR Part:** 091
- **Engines:** 1
- **Damage:** SUBS
## Conditions
- **Light:** DAYL
- **Weather:** VMC
## Probable cause

Failure of a seal in the hydraulic system resulting in a loss of hydraulic pressure while maneuvering at low altitude.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=WPR09LA371) · AI Analytics · CC0 1.0*