# NTSB Accident SEA94LA128
> **BELL 204B** · 1994-05-27 · LIBBY, MT, USA · SERS
## Event
- **NTSB number:** SEA94LA128
- **Event ID:** 20001206X01402
- **Type:** Accident
- **Date:** 1994-05-27
- **Location:** LIBBY, MT, USA
- **Coordinates:** 48.320678, -115.360084
## Injuries
- **Highest injury:** SERS
- **Fatal:** 0
- **Serious:** 1
- **Minor:** 0
- **Uninjured:** 0
- **Total aboard:** 1
## Aircraft
- **Make:** BELL
- **Model:** 204B
- **Registration:** N911SW
- **FAR Part:** 133
- **Engines:** 1
- **Damage:** SUBS
## Conditions
- **Light:** DAYL
- **Weather:** VMC
## Probable cause

THE FATIGUE FRACTURE OF THE 42 DEGREE GEAR BOX INPUT PINION. FACTORS INCLUDE UNSUITABLE, MOUNTAINOUS/HILLY TERRAIN.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=SEA94LA128) · AI Analytics · CC0 1.0*