# NTSB Accident DEN91LA095
> **BELL 412** · 1991-07-01 · GRAND JUNCTION, CO, USA · NONE
## Event
- **NTSB number:** DEN91LA095
- **Event ID:** 20001212X17526
- **Type:** Accident
- **Date:** 1991-07-01
- **Location:** GRAND JUNCTION, CO, USA
- **Coordinates:** 39.08078, -108.549804
## Injuries
- **Highest injury:** NONE
- **Fatal:** 0
- **Serious:** 0
- **Minor:** 0
- **Uninjured:** 3
- **Total aboard:** 3
## Aircraft
- **Make:** BELL
- **Model:** 412
- **Registration:** N20703
- **FAR Part:** 091
- **Engines:** 2
- **Damage:** SUBS
## Conditions
- **Light:** DAYL
- **Weather:** VMC
## Probable cause

THE PILOT'S FAILURE TO MAINTAIN ADEQUATE MAIN ROTOR RPM PRIOR TO TOUCHDOWN.  FACTORS WERE:  THE DISCONNECTED ENGINE TO TRANSMISSION DRIVE SHAFT AND THE INADEQUATE INSPECTION BY COMPANY MAINTENANCE PERSONNEL.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=DEN91LA095) · AI Analytics · CC0 1.0*