# NTSB Accident LAX99LA081
> **Hiller UH-12E** · 1999-01-24 · LEMOORE, CA, USA · NONE
## Event
- **NTSB number:** LAX99LA081
- **Event ID:** 20001204X00083
- **Type:** Accident
- **Date:** 1999-01-24
- **Location:** LEMOORE, CA, USA
- **Coordinates:** 36.290092, -119.820549
## Injuries
- **Highest injury:** NONE
- **Fatal:** 0
- **Serious:** 0
- **Minor:** 0
- **Uninjured:** 1
- **Total aboard:** 1
## Aircraft
- **Make:** Hiller
- **Model:** UH-12E
- **Registration:** N67064
- **FAR Part:** 137
- **Engines:** 1
- **Damage:** SUBS
## Conditions
- **Light:** DAYL
- **Weather:** VMC
## Probable cause

The inadequate nature of the operator's maintenance, which failed to detect the primer and magneto discrepancies.  An overly lean fuel mixture and/or magneto cross firing resulted in detonation, an ensuing connecting rod failure, and a total loss of engine power.  Contributing factors were the helicopter's low altitude and the uneven, soft nature of the terrain.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=LAX99LA081) · AI Analytics · CC0 1.0*