# NTSB Accident SEA91LA145
> **PIPER PA-18-150** · 1991-06-10 · CORVALLIS, OR, USA · SERS
## Event
- **NTSB number:** SEA91LA145
- **Event ID:** 20001212X17394
- **Type:** Accident
- **Date:** 1991-06-10
- **Location:** CORVALLIS, OR, USA
- **Coordinates:** 44.459033, -123.339134
## Injuries
- **Highest injury:** SERS
- **Fatal:** 0
- **Serious:** 1
- **Minor:** 0
- **Uninjured:** 0
- **Total aboard:** 1
## Aircraft
- **Make:** PIPER
- **Model:** PA-18-150
- **Registration:** N3474Z
- **FAR Part:** 091
- **Engines:** 1
- **Damage:** DEST
## Conditions
- **Light:** DUSK
- **Weather:** VMC
## Probable cause

THE PILOT DISPLAYED POOR IN-FLIGHT PLANNING.  A FACTOR TO THE ACCIDENT WAS:  THE PILOT DID NOT MAINTAIN A PROPER ALTITUDE OVER MOUNTAINOUS TERRAIN.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=SEA91LA145) · AI Analytics · CC0 1.0*