# NTSB Accident SEA99LA050
> **Piper PA-18** · 1999-04-10 · BOULDER, MT, USA · NONE
## Event
- **NTSB number:** SEA99LA050
- **Event ID:** 20001205X00564
- **Type:** Accident
- **Date:** 1999-04-10
- **Location:** BOULDER, MT, USA
- **Coordinates:** 46.17073, -111.98928
## Injuries
- **Highest injury:** NONE
- **Fatal:** 0
- **Serious:** 0
- **Minor:** 0
- **Uninjured:** 2
- **Total aboard:** 2
## Aircraft
- **Make:** Piper
- **Model:** PA-18
- **Registration:** N4036E
- **FAR Part:** 091
- **Engines:** 1
- **Damage:** SUBS
## Conditions
- **Light:** DAYL
- **Weather:** VMC
## Probable cause

The pilot-in-command's failure to maintain directional control after encountering a dust-devil during landing rollout, resulting in a ground loop and collapse of the main landing gear.  Factors include the dust-devil.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=SEA99LA050) · AI Analytics · CC0 1.0*