# NTSB Accident FTW97LA298
> **Piper J3C-65** · 1997-08-03 · CASTLE ROCK, CO, USA · NONE
## Event
- **NTSB number:** FTW97LA298
- **Event ID:** 20001208X08617
- **Type:** Accident
- **Date:** 1997-08-03
- **Location:** CASTLE ROCK, CO, USA
- **Coordinates:** 39.370109, -104.849502
## Injuries
- **Highest injury:** NONE
- **Fatal:** 0
- **Serious:** 0
- **Minor:** 0
- **Uninjured:** 1
- **Total aboard:** 1
## Aircraft
- **Make:** Piper
- **Model:** J3C-65
- **Registration:** N5985V
- **FAR Part:** 091
- **Engines:** 1
- **Damage:** SUBS
## Conditions
- **Light:** DAYL
- **Weather:** VMC
## Probable cause

A partial loss of engine power due to a cylinder exhaust valve jammed in the open position from excessive carbon deposits.  A factor was the lack of suitable terrain on which to make a forced landing.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=FTW97LA298) · AI Analytics · CC0 1.0*