# NTSB Accident WPR17LA176
> **CESSNA 172S** · 2017-07-31 · Seattle, WA, USA · MINR
## Event
- **NTSB number:** WPR17LA176
- **Event ID:** 20170802X44356
- **Type:** Accident
- **Date:** 2017-07-31
- **Location:** Seattle, WA, USA
- **Coordinates:** 47.54861, -122.40139
## Injuries
- **Highest injury:** MINR
- **Fatal:** 0
- **Serious:** 0
- **Minor:** 2
- **Uninjured:** 0
- **Total aboard:** 2
## Aircraft
- **Make:** CESSNA
- **Model:** 172S
- **Registration:** N957TA
- **FAR Part:** 091
- **Engines:** 1
- **Damage:** SUBS
## Conditions
- **Light:** DAYL
- **Weather:** VMC
## Probable cause

The total loss of engine power due to oil starvation as a result of the loose right magneto, which allowed oil to escape and the engine to seize. Contributing to the accident was inadequate maintenance, which failed to identify the loose magneto bolt.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=WPR17LA176) · AI Analytics · CC0 1.0*