# NTSB Accident WPR21LA039
> **AGUSTA A109** · 2020-11-06 · Los Angeles, CA, USA · SERS
## Event
- **NTSB number:** WPR21LA039
- **Event ID:** 20201107102246
- **Type:** Accident
- **Date:** 2020-11-06
- **Location:** Los Angeles, CA, USA
- **Coordinates:** 34.058037, -118.20811
## Injuries
- **Highest injury:** SERS
- **Fatal:** 0
- **Serious:** 2
- **Minor:** 1
- **Uninjured:** 0
- **Total aboard:** 3
## Aircraft
- **Make:** AGUSTA
- **Model:** A109
- **Registration:** N109EX
- **FAR Part:** 135
- **Engines:** 2
- **Damage:** SUBS
## Conditions
- **Light:** DAYL
- **Weather:** VMC
## Probable cause

The loss of tail rotor control due to the separation of the tail rotor duplex bearing ring nut from the thrust sleeve, which resulted in the loss of helicopter control.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=WPR21LA039) · AI Analytics · CC0 1.0*