# NTSB Accident ATL91LA066
> **BENSON B8M** · 1991-03-16 · HARTSELLE, AL, USA · FATL
## Event
- **NTSB number:** ATL91LA066
- **Event ID:** 20001212X16545
- **Type:** Accident
- **Date:** 1991-03-16
- **Location:** HARTSELLE, AL, USA
- **Coordinates:** 34.429634, -86.929107
## Injuries
- **Highest injury:** FATL
- **Fatal:** 1
- **Serious:** 0
- **Minor:** 0
- **Uninjured:** 0
- **Total aboard:** 1
## Aircraft
- **Make:** BENSON
- **Model:** B8M
- **Registration:** N6572K
- **FAR Part:** 091
- **Engines:** 1
- **Damage:** SUBS
## Conditions
- **Light:** DAYL
- **Weather:** VMC
## Probable cause

THE IMPROPER INSTALLATION OF THE MAIN ROTOR BEARING BLOCK BY THE OWNER/PILOT WHICH RESULTED IN THE SEPARATION OF THE MAIN ROTOR SYSTEM.

---
*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=ATL91LA066) · AI Analytics · CC0 1.0*