# NTSB Accident LAX03LA236
> **Bell 47G-2A** · 2003-07-20 · Porterville, CA, USA · NONE
## Event
- **NTSB number:** LAX03LA236
- **Event ID:** 20040915X01431
- **Type:** Accident
- **Date:** 2003-07-20
- **Location:** Porterville, CA, USA
- **Coordinates:** 36.131668, -119.214996
## Injuries
- **Highest injury:** NONE
- **Fatal:** 0
- **Serious:** 0
- **Minor:** 0
- **Uninjured:** 1
- **Total aboard:** 1
## Aircraft
- **Make:** Bell
- **Model:** 47G-2A
- **Registration:** N4774S
- **FAR Part:** 137
- **Engines:** 1
- **Damage:** SUBS
## Conditions
- **Light:** NDRK
- **Weather:** VMC
## Probable cause

Fatigue-induced failure of bolts in the helicopter's rotor drive flange, which resulted in a total loss of torque to the rotor drive shaft.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=LAX03LA236) · AI Analytics · CC0 1.0*