# NTSB Accident LAX91LA369
> **HILLER UH12D** · 1991-08-25 · SPARKS, NV, USA · NONE
## Event
- **NTSB number:** LAX91LA369
- **Event ID:** 20001212X17910
- **Type:** Accident
- **Date:** 1991-08-25
- **Location:** SPARKS, NV, USA
- **Coordinates:** 39.599884, -119.690567
## Injuries
- **Highest injury:** NONE
- **Fatal:** 0
- **Serious:** 0
- **Minor:** 0
- **Uninjured:** 1
- **Total aboard:** 1
## Aircraft
- **Make:** HILLER
- **Model:** UH12D
- **Registration:** N100HH
- **FAR Part:** 091
- **Engines:** 1
- **Damage:** SUBS
## Conditions
- **Light:** DUSK
- **Weather:** VMC
## Probable cause

THE ENCOUNTER WITH ROUGH, UNSUITABLE TERRAIN DURING A PRECAUTIONARY LANDING. CONTRIBUTING TO THE ACCIDENT WAS THE PILOT'S DECISION TO MAKE AN AUTOROTATION AFTER ENCOUNTERING AN AIRFRAME VIBRATION.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=LAX91LA369) · AI Analytics · CC0 1.0*