# NTSB Accident WPR13LA358
> **BELL 206B** · 2013-08-04 · Chualar, CA, USA · MINR
## Event
- **NTSB number:** WPR13LA358
- **Event ID:** 20130804X74727
- **Type:** Accident
- **Date:** 2013-08-04
- **Location:** Chualar, CA, USA
- **Coordinates:** 36.537498, -121.541664
## Injuries
- **Highest injury:** MINR
- **Fatal:** 0
- **Serious:** 0
- **Minor:** 1
- **Uninjured:** 0
- **Total aboard:** 1
## Aircraft
- **Make:** BELL
- **Model:** 206B
- **Registration:** N90146
- **FAR Part:** 137
- **Engines:** 1
- **Damage:** SUBS
## Conditions
- **Light:** DAYL
- **Weather:** VMC
## Probable cause

Maintenance personnel's failure to properly tighten the bolts securing the main driveshaft to the transmission, which resulted in fatigue failure of the bolts and disconnection of the driveshaft during low-altitude flight.

---
*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=WPR13LA358) · AI Analytics · CC0 1.0*