# NTSB Accident LAX91LA191
> **HILLER UH-12E** · 1991-05-04 · DELANO, CA, USA · NONE
## Event
- **NTSB number:** LAX91LA191
- **Event ID:** 20001212X17025
- **Type:** Accident
- **Date:** 1991-05-04
- **Location:** DELANO, CA, USA
- **Coordinates:** 35.780582, -119.230796
## Injuries
- **Highest injury:** NONE
- **Fatal:** 0
- **Serious:** 0
- **Minor:** 0
- **Uninjured:** 1
- **Total aboard:** 1
## Aircraft
- **Make:** HILLER
- **Model:** UH-12E
- **Registration:** N4414
- **FAR Part:** 137
- **Engines:** 1
- **Damage:** SUBS
## Conditions
- **Light:** DAYL
- **Weather:** VMC
## Probable cause

THAT THE PILOT IMPROPERLY PERFORMED THE AUTOROTATION BY MISJUDGING THE FLARE ALTITUDE.  CONTRIBUTING TO THIS ACCIDENT WAS THE TOTAL FAILURE OF THE FREEWHEELING SPRAG CLUTCH DUE TO EXCESSIVE WEAR AND THE SOFT DIRT TERRAIN.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=LAX91LA191) · AI Analytics · CC0 1.0*