# NTSB Accident WPR17LA048
> **SCHOSANSKI JOHN H COZY MK IV R** · 2017-01-04 · Napa, CA, USA · NONE
## Event
- **NTSB number:** WPR17LA048
- **Event ID:** 20170105X45917
- **Type:** Accident
- **Date:** 2017-01-04
- **Location:** Napa, CA, USA
- **Coordinates:** 38.208889, -122.29
## Injuries
- **Highest injury:** NONE
- **Fatal:** 0
- **Serious:** 0
- **Minor:** 0
- **Uninjured:** 1
- **Total aboard:** 1
## Aircraft
- **Make:** SCHOSANSKI JOHN H
- **Model:** COZY MK IV R
- **Registration:** N4518S
- **FAR Part:** 091
- **Engines:** 1
- **Damage:** SUBS
## Conditions
- **Light:** DAYL
- **Weather:** VMC
## Probable cause

A partial loss of power due to missing apex seals.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=WPR17LA048) · AI Analytics · CC0 1.0*