# NTSB Accident SEA99LA108
> **Williamson/Williamson RV-4** · 1999-07-07 · COOS BAY, OR, USA · SERS
## Event
- **NTSB number:** SEA99LA108
- **Event ID:** 20001212X19367
- **Type:** Accident
- **Date:** 1999-07-07
- **Location:** COOS BAY, OR, USA
- **Coordinates:** 43.370056, -124.140213
## Injuries
- **Highest injury:** SERS
- **Fatal:** 0
- **Serious:** 1
- **Minor:** 0
- **Uninjured:** 0
- **Total aboard:** 1
## Aircraft
- **Make:** Williamson/Williamson
- **Model:** RV-4
- **Registration:** N6NW
- **FAR Part:** 091
- **Engines:** 1
- **Damage:** SUBS
## Conditions
- **Light:** DAYL
- **Weather:** VMC
## Probable cause

Inadequate aircraft preflight inspection (engine air inlet cover not removed) by the pilot, resulting in obstruction of the carburetor air inlet in flight and consequent inflight engine stoppage.  Factors contributing to the accident included a vehicle entering the attempted forced landing surface, and fence posts in the forced landing area.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=SEA99LA108) · AI Analytics · CC0 1.0*