# NTSB Accident CEN15LA379
> **ROBINSON HELICOPTER COMPANY R44 II** · 2015-08-25 · Ketchum, OK, USA · MINR
## Event
- **NTSB number:** CEN15LA379
- **Event ID:** 20150825X45052
- **Type:** Accident
- **Date:** 2015-08-25
- **Location:** Ketchum, OK, USA
- **Coordinates:** 36.549167, -95.000274
## Injuries
- **Highest injury:** MINR
- **Fatal:** 0
- **Serious:** 0
- **Minor:** 1
- **Uninjured:** 0
- **Total aboard:** 1
## Aircraft
- **Make:** ROBINSON HELICOPTER COMPANY
- **Model:** R44 II
- **Registration:** N444KD
- **FAR Part:** 091
- **Engines:** 1
- **Damage:** SUBS
## Conditions
- **Light:** DAYL
- **Weather:** VMC
## Probable cause

The separation of the tail rotor gearbox from the tailboom aft bulkhead due to overstress loads imposed by a blade imbalance from an in-flight impact with an undetermined object.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=CEN15LA379) · AI Analytics · CC0 1.0*