# NTSB Accident WPR09FA141
> **STEPHENSON ZODIAC 601 XL** · 2009-03-03 · Antelope Island, UT, USA · FATL
## Event
- **NTSB number:** WPR09FA141
- **Event ID:** 20090304X63009
- **Type:** Accident
- **Date:** 2009-03-03
- **Location:** Antelope Island, UT, USA
- **Coordinates:** 40.959167, -112.230278
## Injuries
- **Highest injury:** FATL
- **Fatal:** 1
- **Serious:** 0
- **Minor:** 0
- **Uninjured:** 0
- **Total aboard:** 1
## Aircraft
- **Make:** STEPHENSON
- **Model:** ZODIAC 601 XL
- **Registration:** N3683X
- **FAR Part:** 091
- **Engines:** 1
- **Damage:** SUBS
## Conditions
- **Light:** DAYL
- **Weather:** VMC
## Probable cause

The in-flight failure of both wings due to aileron flutter. The aileron flutter was the result of inadequate wing stiffness and the lack of aileron counterbalances.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=WPR09FA141) · AI Analytics · CC0 1.0*