# NTSB Accident ANC17LA051
> **LEONARDO AW139** · 2017-09-02 · Tujunga, CA, USA · NONE
## Event
- **NTSB number:** ANC17LA051
- **Event ID:** 20170908X51711
- **Type:** Accident
- **Date:** 2017-09-02
- **Location:** Tujunga, CA, USA
- **Coordinates:** 34.246387, -118.30027
## Injuries
- **Highest injury:** NONE
- **Fatal:** 0
- **Serious:** 0
- **Minor:** 0
- **Uninjured:** 2
- **Total aboard:** 2
## Aircraft
- **Make:** LEONARDO
- **Model:** AW139
- **Registration:** N304FD
- **FAR Part:** PUBU
- **Engines:** 2
- **Damage:** SUBS
## Conditions
- **Light:** DAYL
- **Weather:** VMC
## Probable cause

A yaw excursion and uncontrolled descent due to loss of tail rotor effectiveness during aerial firefighting operations resulting in an impact with trees. A contributing factor was the pilot’s failure to maintain sufficient airspeed, coupled with a quartering tailwind during aerial firefighting operations. An additional factor was the operator’s lack of guidance to the hazards associated with aerial firefighting operations near and around smoke columns.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=ANC17LA051) · AI Analytics · CC0 1.0*