# NTSB Accident LAX99LA283
> **Bell UH-1B** · 1999-08-25 · LOST HILLS, CA, USA · NONE
## Event
- **NTSB number:** LAX99LA283
- **Event ID:** 20001212X19566
- **Type:** Accident
- **Date:** 1999-08-25
- **Location:** LOST HILLS, CA, USA
- **Coordinates:** 35.609443, -119.899505
## Injuries
- **Highest injury:** NONE
- **Fatal:** 0
- **Serious:** 0
- **Minor:** 0
- **Uninjured:** 1
- **Total aboard:** 1
## Aircraft
- **Make:** Bell
- **Model:** UH-1B
- **Registration:** N999SJ
- **FAR Part:** 137
- **Engines:** 1
- **Damage:** SUBS
## Conditions
- **Light:** NBRT
- **Weather:** VMC
## Probable cause

Failure and separation of the 90-degree gearbox as a result of the disengagement of the pinion and gear teeth.  The cause(s) of the pinion and gear disengagement were undetermined.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=LAX99LA283) · AI Analytics · CC0 1.0*