# NTSB Accident CEN19LA092
> **Bell 407** · 2019-03-03 · Union Center, SD, USA · MINR
## Event
- **NTSB number:** CEN19LA092
- **Event ID:** 20190303X31449
- **Type:** Accident
- **Date:** 2019-03-03
- **Location:** Union Center, SD, USA
- **Coordinates:** 44.564723, -102.661392
## Injuries
- **Highest injury:** MINR
- **Fatal:** 0
- **Serious:** 0
- **Minor:** 1
- **Uninjured:** 2
- **Total aboard:** 3
## Aircraft
- **Make:** Bell
- **Model:** 407
- **Registration:** N450AM
- **FAR Part:** 135
- **Engines:** 1
- **Damage:** SUBS
## Conditions
- **Light:** NDRK
- **Weather:** VMC
## Probable cause

The ambulance driver’s failure to see the helicopter’s rotating main rotor blades in dark night conditions, which resulted in the ambulance’s inadvertent collision with the helicopter. Contributing to the accident was the ambulance driver's failure to follow procedures when approaching the helicopter.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=CEN19LA092) · AI Analytics · CC0 1.0*