# NTSB Accident FTW99LA228
> **Aviat S1-11B** · 1999-08-14 · KATY, TX, USA · NONE
## Event
- **NTSB number:** FTW99LA228
- **Event ID:** 20001212X19520
- **Type:** Accident
- **Date:** 1999-08-14
- **Location:** KATY, TX, USA
- **Coordinates:** 29.75035, -95.740905
## Injuries
- **Highest injury:** NONE
- **Fatal:** 0
- **Serious:** 0
- **Minor:** 0
- **Uninjured:** 1
- **Total aboard:** 1
## Aircraft
- **Make:** Aviat
- **Model:** S1-11B
- **Registration:** N540DM
- **FAR Part:** 091
- **Engines:** 1
- **Damage:** SUBS
## Conditions
- **Light:** DAYL
- **Weather:** VMC
## Probable cause

The pilot's inability to maintain directional control of the tailwheel equipped biplane following the failure of the left brake master cylinder.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=FTW99LA228) · AI Analytics · CC0 1.0*