# NTSB Accident CEN14LA358
> **GRUMMAN ACFT ENG COR-SCHWEIZER G-164B** · 2014-07-09 · Garrison, ND, USA · NONE
## Event
- **NTSB number:** CEN14LA358
- **Event ID:** 20140714X05310
- **Type:** Accident
- **Date:** 2014-07-09
- **Location:** Garrison, ND, USA
- **Coordinates:** 47.681667, -101.239166
## Injuries
- **Highest injury:** NONE
- **Fatal:** 0
- **Serious:** 0
- **Minor:** 0
- **Uninjured:** 1
- **Total aboard:** 1
## Aircraft
- **Make:** GRUMMAN ACFT ENG COR-SCHWEIZER
- **Model:** G-164B
- **Registration:** N6648Q
- **FAR Part:** 137
- **Engines:** 1
- **Damage:** SUBS
## Conditions
- **Light:** DAYL
- **Weather:** VMC
## Probable cause

Excessive wear between the power turbine shaft and quill shaft spline, which led to the disconnection of the power turbine wheel, an overspeed of the power turbine, and the subsequent loss of engine power. Contributing to the accident was maintenance personnel’s failure to detect contaminants in the oil filter during the engine’s recent 100-hour inspection.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=CEN14LA358) · AI Analytics · CC0 1.0*