# NTSB Accident LAX91LA135
> **MOONEY M20D** · 1991-03-18 · HERLONG, CA, USA · NONE
## Event
- **NTSB number:** LAX91LA135
- **Event ID:** 20001212X16633
- **Type:** Accident
- **Date:** 1991-03-18
- **Location:** HERLONG, CA, USA
- **Coordinates:** 40.139671, -120.160484
## Injuries
- **Highest injury:** NONE
- **Fatal:** 0
- **Serious:** 0
- **Minor:** 0
- **Uninjured:** 3
- **Total aboard:** 3
## Aircraft
- **Make:** MOONEY
- **Model:** M20D
- **Registration:** N1921Y
- **FAR Part:** 091
- **Engines:** 1
- **Damage:** SUBS
## Conditions
- **Light:** DAYL
- **Weather:** VMC
## Probable cause

THE INADEQUATE PREPARATION OF THE PROPELLER DURING OVERHAUL.  THE INSTALLATION OF AN IMPROPER PITCHED PROPELLER AND THE FATIGUE FAILURE OF THE PROPELLER BLADE EMANATING FROM CORROSION WERE FACTORS IN THE ACCIDENT.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=LAX91LA135) · AI Analytics · CC0 1.0*