# NTSB Accident CHI99LA071
> **Cessna 172R** · 1999-01-20 · CHESTERFIELD, MO, USA · NONE
## Event
- **NTSB number:** CHI99LA071
- **Event ID:** 20001204X00030
- **Type:** Accident
- **Date:** 1999-01-20
- **Location:** CHESTERFIELD, MO, USA
- **Coordinates:** 38.650566, -90.530967
## Injuries
- **Highest injury:** NONE
- **Fatal:** 0
- **Serious:** 0
- **Minor:** 0
- **Uninjured:** 2
- **Total aboard:** 2
## Aircraft
- **Make:** Cessna
- **Model:** 172R
- **Registration:** N4172P
- **FAR Part:** 091
- **Engines:** 1
- **Damage:** SUBS
## Conditions
- **Light:** NDRK
- **Weather:** VMC
## Probable cause

the instructor pilot's failure to maintain aircraft control.   Factors contributing to this accident were the snow covered grassy field area along the side of the runway and the pile of snow.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=CHI99LA071) · AI Analytics · CC0 1.0*