# NTSB Accident ATL89DKG06
> **BELL UH-1B** · 1989-09-29 · PLAINS, GA, USA · FATL
## Event
- **NTSB number:** ATL89DKG06
- **Event ID:** 20001213X29290
- **Type:** Accident
- **Date:** 1989-09-29
- **Location:** PLAINS, GA, USA
- **Coordinates:** 32.069782, -84.219223
## Injuries
- **Highest injury:** FATL
- **Fatal:** 2
- **Serious:** 0
- **Minor:** 0
- **Uninjured:** 0
- **Total aboard:** 2
## Aircraft
- **Make:** BELL
- **Model:** UH-1B
- **Registration:** N840MC
- **FAR Part:** 137
- **Engines:** 1
- **Damage:** DEST
## Conditions
- **Light:** DAYL
- **Weather:** VMC
## Probable cause

IMPROPER MODIFICATION OF THE HELICOPTER BY THE COMPANY/OPERATOR, AND FAILURE OF THE SPRAY BOOM, WHICH RESULTED IN MAST BUMPING, AND SUBSEQUENT FAILURE OF THE MAIN ROTOR ASSEMBLY.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=ATL89DKG06) · AI Analytics · CC0 1.0*