# NTSB Accident LAX91FA282
> **BEECH 65** · 1991-06-30 · PIONEER, CA, USA · FATL
## Event
- **NTSB number:** LAX91FA282
- **Event ID:** 20001212X17290
- **Type:** Accident
- **Date:** 1991-06-30
- **Location:** PIONEER, CA, USA
- **Coordinates:** 38.519603, -120.38092
## Injuries
- **Highest injury:** FATL
- **Fatal:** 6
- **Serious:** 0
- **Minor:** 0
- **Uninjured:** 0
- **Total aboard:** 6
## Aircraft
- **Make:** BEECH
- **Model:** 65
- **Registration:** N713JB
- **FAR Part:** 091
- **Engines:** 2
- **Damage:** DEST
## Conditions
- **Light:** DAYL
- **Weather:** VMC
## Probable cause

IMPROPER EMERGENCY PROCEDURES BY THE PILOT, WHEN HE INADVERTENTLY SHUT DOWN THE LEFT ENGINE AFTER ENCOUNTERING A PARTIAL LOSS OF POWER IN THE RIGHT ENGINE.  FACTORS RELATED TO THE ACCIDENT WERE:  IMPROPER INSTALLATION OF THE RIGHT ENGINE'S #6 EXHAUST VALVE SEAT BY OTHER MAINTENANCE PERSONNEL, FATIGUE FAILURE OF THE #6 EXHAUST VALVE, AND THE PILOT'S LACK OF FAMILIARITY WITH THE AIRCRAFT.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=LAX91FA282) · AI Analytics · CC0 1.0*