# NTSB Accident CEN14LA439
> **AIR TRACTOR AT-401** · 2014-08-19 · Wray, CO, USA · MINR
## Event
- **NTSB number:** CEN14LA439
- **Event ID:** 20140819X34156
- **Type:** Accident
- **Date:** 2014-08-19
- **Location:** Wray, CO, USA
- **Coordinates:** 40.100276, -102.240837
## Injuries
- **Highest injury:** MINR
- **Fatal:** 0
- **Serious:** 0
- **Minor:** 1
- **Uninjured:** 0
- **Total aboard:** 1
## Aircraft
- **Make:** AIR TRACTOR
- **Model:** AT-401
- **Registration:** N4542W
- **FAR Part:** 137
- **Engines:** 1
- **Damage:** SUBS
## Conditions
- **Light:** DAYL
- **Weather:** VMC
## Probable cause

A loss of the No. 1 cylinder’s compression due to a stuck exhaust valve caused by a lack of sufficient valve clearance, which resulted in a loss of engine power and a forced landing. Contributing to the loss of engine power were the worn intake and exhaust valves in cylinders No. 3 and 4.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=CEN14LA439) · AI Analytics · CC0 1.0*