# NTSB Accident WPR18TA223
> **Zenair ZENITH STOL CH750** · 2018-08-11 · Napa, CA, USA · NONE
## Event
- **NTSB number:** WPR18TA223
- **Event ID:** 20180811X71550
- **Type:** Accident
- **Date:** 2018-08-11
- **Location:** Napa, CA, USA
- **Coordinates:** 38.2, -122.291664
## Injuries
- **Highest injury:** NONE
- **Fatal:** 0
- **Serious:** 0
- **Minor:** 0
- **Uninjured:** 2
- **Total aboard:** 2
## Aircraft
- **Make:** Zenair
- **Model:** ZENITH STOL CH750
- **Registration:** N328SK
- **FAR Part:** 091
- **Engines:** 1
- **Damage:** SUBS
## Conditions
- **Light:** DAYL
- **Weather:** VMC
## Probable cause

The pilot's use of fuel below the required octane rating, which caused engine detonation and damage and subsequently led to oil exhaustion and a total loss of engine power in flight. Contributing to the accident was the pilot's inadequate service/maintenance of the airplane.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=WPR18TA223) · AI Analytics · CC0 1.0*