# NTSB Incident CEN12IA123
> **BOEING 737-7H4** · 2011-12-22 · Denver, CO, USA · NONE
## Event
- **NTSB number:** CEN12IA123
- **Event ID:** 20120105X34138
- **Type:** Incident
- **Date:** 2011-12-22
- **Location:** Denver, CO, USA
- **Coordinates:** 39.750244, -104.999649
## Injuries
- **Highest injury:** NONE
- **Fatal:** 0
- **Serious:** 0
- **Minor:** 0
- **Uninjured:** 133
- **Total aboard:** 133
## Aircraft
- **Make:** BOEING
- **Model:** 737-7H4
- **Registration:** N469WN
- **FAR Part:** 121
- **Engines:** 2
- **Damage:** MINR
## Conditions
- **Light:** DAYL
- **Weather:** IMC
## Probable cause

The snowplow operator’s incapacitation due to fatigue, which resulted in the snowplow contacting a parked airplane. Contributing to the incident was the company’s lack of a policy regarding employee fatigue.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=CEN12IA123) · AI Analytics · CC0 1.0*