# NTSB Accident FTW02LA021
> **Cessna 152** · 2001-10-26 · Bethany, OK, USA · NONE
## Event
- **NTSB number:** FTW02LA021
- **Event ID:** 20011029X02154
- **Type:** Accident
- **Date:** 2001-10-26
- **Location:** Bethany, OK, USA
- **Coordinates:** 35.49921, -97.640449
## Injuries
- **Highest injury:** NONE
- **Fatal:** 0
- **Serious:** 0
- **Minor:** 0
- **Uninjured:** 1
- **Total aboard:** 1
## Aircraft
- **Make:** Cessna
- **Model:** 152
- **Registration:** N67797
- **FAR Part:** 091
- **Engines:** 1
- **Damage:** SUBS
## Conditions
- **Light:** NITE
- **Weather:** VMC
## Probable cause

the mechanic's failure to properly lock the exhaust valve's clearance adjusting screw locknut, which resulted in a loose nut, disabling of the exhaust valve pushrod, and a partial loss of engine power while in cruise flight.  A contributing factor was the night light conditions for the forced landing.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=FTW02LA021) · AI Analytics · CC0 1.0*