# NTSB Accident ERA21LA386
> **HILLER UH-12E** · 2021-09-29 · Millen, GA, USA · MINR
## Event
- **NTSB number:** ERA21LA386
- **Event ID:** 20210929103994
- **Type:** Accident
- **Date:** 2021-09-29
- **Location:** Millen, GA, USA
- **Coordinates:** 32.615, -82.002222
## Injuries
- **Highest injury:** MINR
- **Fatal:** 0
- **Serious:** 0
- **Minor:** 1
- **Uninjured:** 0
- **Total aboard:** 1
## Aircraft
- **Make:** HILLER
- **Model:** UH-12E
- **Registration:** N430NR
- **FAR Part:** 137
- **Engines:** 1
- **Damage:** SUBS
## Conditions
- **Light:** DAYL
- **Weather:** VMC
## Probable cause

The improper reassembly of the tail rotor gearbox following maintenance, which resulted in fatigue failure of the input pinion gear shaft, and the subsequent loss of tail rotor drive.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=ERA21LA386) · AI Analytics · CC0 1.0*