# NTSB Accident SEA90LA010
> **HUGHES 369D** · 1989-10-27 · NEAH BAY, WA, USA · NONE
## Event
- **NTSB number:** SEA90LA010
- **Event ID:** 20001213X29720
- **Type:** Accident
- **Date:** 1989-10-27
- **Location:** NEAH BAY, WA, USA
- **Coordinates:** 48.329326, -124.630706
## Injuries
- **Highest injury:** NONE
- **Fatal:** 0
- **Serious:** 0
- **Minor:** 0
- **Uninjured:** 1
- **Total aboard:** 1
## Aircraft
- **Make:** HUGHES
- **Model:** 369D
- **Registration:** N9163F
- **FAR Part:** 133
- **Engines:** 1
- **Damage:** SUBS
## Conditions
- **Light:** DAYL
- **Weather:** VMC
## Probable cause

FATIGUE FAILURE OF ALL FOUR ATTACHMENT STUDS OF THE TAILROTOR GEARBOX RESULTING IN SEPARATION OF THE GEAR BOX, AND INADEQUATE MAINTENANCE INSPECTION.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=SEA90LA010) · AI Analytics · CC0 1.0*