# NTSB Accident WPR20LA228
> **Md Helicopter 600** · 2020-07-20 · San Andreas, CA, USA · NONE
## Event
- **NTSB number:** WPR20LA228
- **Event ID:** 20200720X84108
- **Type:** Accident
- **Date:** 2020-07-20
- **Location:** San Andreas, CA, USA
- **Coordinates:** 38.206264, -120.71358
## Injuries
- **Highest injury:** NONE
- **Fatal:** 0
- **Serious:** 0
- **Minor:** 0
- **Uninjured:** 3
- **Total aboard:** 3
## Aircraft
- **Make:** Md Helicopter
- **Model:** 600
- **Registration:** N745BW
- **FAR Part:** 091
- **Engines:** 1
- **Damage:** DEST
## Conditions
- **Light:** DAYL
- **Weather:** VMC
## Probable cause

The failure of the output shaft of the overrunning clutch inner race due to frictional overheating of the shaft, which resulted from the failure of the output bearing’s stainless-steel grease seal.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=WPR20LA228) · AI Analytics · CC0 1.0*