# NTSB Accident SEA04LA063
> **Glasflugel STD Libelle 201B** · 2004-04-02 · Oso, WA, USA · FATL
## Event
- **NTSB number:** SEA04LA063
- **Event ID:** 20040414X00461
- **Type:** Accident
- **Date:** 2004-04-02
- **Location:** Oso, WA, USA
- **Coordinates:** 48.239723, -121.900001
## Injuries
- **Highest injury:** FATL
- **Fatal:** 1
- **Serious:** 0
- **Minor:** 1
- **Uninjured:** 0
- **Total aboard:** 2
## Aircraft
- **Make:** Glasflugel
- **Model:** STD Libelle 201B
- **Registration:** N161D
- **FAR Part:** 091
- **Engines:** —
- **Damage:** SUBS
## Conditions
- **Light:** DAYL
- **Weather:** VMC
## Probable cause

The pilot of the Glaser-Dirks (lead glider) failure to maintain clearance form the Glasflugel (trailing glider) resulting in a mid-air collision while maneuvering.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=SEA04LA063) · AI Analytics · CC0 1.0*