# NTSB Accident WPR13TA081
> **BELL HELICOPTER TEXTRON CANADA 407** · 2012-12-28 · Renton, WA, USA · NONE
## Event
- **NTSB number:** WPR13TA081
- **Event ID:** 20130102X23415
- **Type:** Accident
- **Date:** 2012-12-28
- **Location:** Renton, WA, USA
- **Coordinates:** 47.489166, -122.209442
## Injuries
- **Highest injury:** NONE
- **Fatal:** 0
- **Serious:** 0
- **Minor:** 0
- **Uninjured:** 1
- **Total aboard:** 1
## Aircraft
- **Make:** BELL HELICOPTER TEXTRON CANADA
- **Model:** 407
- **Registration:** N407KS
- **FAR Part:** PUBU
- **Engines:** 1
- **Damage:** SUBS
## Conditions
- **Light:** DAYL
- **Weather:** VMC
## Probable cause

The pilot's failure to maintain helicopter control during takeoff from an unstable landing platform. Contributing to the accident was the operator's inadequate chocking procedures for the wheeled landing platform, which included chocking only two of the platforms four rear wheels and led to the platform's instability.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=WPR13TA081) · AI Analytics · CC0 1.0*