# NTSB Accident CHI89DEM09
> **HILLER UH-12E** · 1989-09-28 · HUDSONVILLE, MI, USA · MINR
## Event
- **NTSB number:** CHI89DEM09
- **Event ID:** 20001213X29313
- **Type:** Accident
- **Date:** 1989-09-28
- **Location:** HUDSONVILLE, MI, USA
- **Coordinates:** 42.860935, -85.859397
## Injuries
- **Highest injury:** MINR
- **Fatal:** 0
- **Serious:** 0
- **Minor:** 1
- **Uninjured:** 0
- **Total aboard:** 1
## Aircraft
- **Make:** HILLER
- **Model:** UH-12E
- **Registration:** N4028T
- **FAR Part:** 137
- **Engines:** 1
- **Damage:** SUBS
## Conditions
- **Light:** DAYL
- **Weather:** VMC
## Probable cause

THE FATIGUE FAILURE OF ONE OF THE TENSION-TORSION PINS.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=CHI89DEM09) · AI Analytics · CC0 1.0*