# NTSB Accident LAX91LA389
> **CESSNA 172P** · 1991-09-11 · HESPERIA, CA, USA · SERS
## Event
- **NTSB number:** LAX91LA389
- **Event ID:** 20001212X18119
- **Type:** Accident
- **Date:** 1991-09-11
- **Location:** HESPERIA, CA, USA
- **Coordinates:** 34.359664, -117.319671
## Injuries
- **Highest injury:** SERS
- **Fatal:** 0
- **Serious:** 3
- **Minor:** 0
- **Uninjured:** 0
- **Total aboard:** 3
## Aircraft
- **Make:** CESSNA
- **Model:** 172P
- **Registration:** N97564
- **FAR Part:** 091
- **Engines:** 1
- **Damage:** SUBS
## Conditions
- **Light:** DAYL
- **Weather:** VMC
## Probable cause

A STUCK EXHAUST VALVE DUE TO THE OPERATOR'S NON COMPLIANCE WITH A MANUFACTURERS RECOMMENDED SERVICE BULLETIN ON THE ENGINE.  CONTRIBUTING TO THE ACCIDENT WAS THE LACK OF SUITABLE TERRAIN FOR A SAFE LANDING.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=LAX91LA389) · AI Analytics · CC0 1.0*