# NTSB Accident SEA91LA028
> **AEROSPATIALE SA316B** · 1990-12-03 · VERNAL, UT, USA · MINR
## Event
- **NTSB number:** SEA91LA028
- **Event ID:** 20001212X24818
- **Type:** Accident
- **Date:** 1990-12-03
- **Location:** VERNAL, UT, USA
- **Coordinates:** 40.550571, -109.569252
## Injuries
- **Highest injury:** MINR
- **Fatal:** 0
- **Serious:** 0
- **Minor:** 3
- **Uninjured:** 0
- **Total aboard:** 3
## Aircraft
- **Make:** AEROSPATIALE
- **Model:** SA316B
- **Registration:** N316BS
- **FAR Part:** 135
- **Engines:** 1
- **Damage:** DEST
## Conditions
- **Light:** DAYL
- **Weather:** VMC
## Probable cause

A MALFUNCTION/FAILURE OF THE HELICOPTER'S MAIN ROTOR LEAD-LAG DAMPER.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=SEA91LA028) · AI Analytics · CC0 1.0*