# NTSB Accident WPR17LA119
> **PAUL R SEIPT SONEX** · 2017-06-03 · Garfield, WA, USA · NONE
## Event
- **NTSB number:** WPR17LA119
- **Event ID:** 20170604X50503
- **Type:** Accident
- **Date:** 2017-06-03
- **Location:** Garfield, WA, USA
- **Coordinates:** 46.99139, -117.12722
## Injuries
- **Highest injury:** NONE
- **Fatal:** 0
- **Serious:** 0
- **Minor:** 0
- **Uninjured:** 1
- **Total aboard:** 1
## Aircraft
- **Make:** PAUL R SEIPT
- **Model:** SONEX
- **Registration:** N255BZ
- **FAR Part:** 091
- **Engines:** 1
- **Damage:** SUBS
## Conditions
- **Light:** DAYL
- **Weather:** VMC
## Probable cause

The pilot’s improper torque of screws that attached the flywheel mounting flange to the crankshaft during engine assembly, which resulted in heavy vibrations and the subsequent in-flight loss of the propeller.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=WPR17LA119) · AI Analytics · CC0 1.0*