# NTSB Accident SEA98LA190
> **Cessna 150L** · 1998-09-29 · BONNERS FERRY, ID, USA · NONE
## Event
- **NTSB number:** SEA98LA190
- **Event ID:** 20001211X11180
- **Type:** Accident
- **Date:** 1998-09-29
- **Location:** BONNERS FERRY, ID, USA
- **Coordinates:** 48.749595, -116.509178
## Injuries
- **Highest injury:** NONE
- **Fatal:** 0
- **Serious:** 0
- **Minor:** 0
- **Uninjured:** 1
- **Total aboard:** 1
## Aircraft
- **Make:** Cessna
- **Model:** 150L
- **Registration:** N19427
- **FAR Part:** 091
- **Engines:** 1
- **Damage:** SUBS
## Conditions
- **Light:** DAYL
- **Weather:** VMC
## Probable cause

Improper maintenance by an outsourcing facility which resulted in a lack of identification of scoring of the interior of the #3 cylinder rocker shaft bosses.  The scoring resulted in a fatigue fracture and subsequent permanent closure of both intake and exhaust valves. Contributing factors were the lack of a suitable landing site and trees.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=SEA98LA190) · AI Analytics · CC0 1.0*