# NTSB Accident CEN12FA001
> **ROBINSON HELICOPTER CO R66** · 2011-10-01 · Philip, SD, USA · FATL
## Event
- **NTSB number:** CEN12FA001
- **Event ID:** 20111001X63448
- **Type:** Accident
- **Date:** 2011-10-01
- **Location:** Philip, SD, USA
- **Coordinates:** 44.017776, -101.634445
## Injuries
- **Highest injury:** FATL
- **Fatal:** 1
- **Serious:** 0
- **Minor:** 0
- **Uninjured:** 0
- **Total aboard:** 1
## Aircraft
- **Make:** ROBINSON HELICOPTER CO
- **Model:** R66
- **Registration:** N266CY
- **FAR Part:** 091
- **Engines:** 1
- **Damage:** DEST
## Conditions
- **Light:** DAYL
- **Weather:** VMC
## Probable cause

The in-flight separation of the main rotor mast following a mast bumping event. The reason for the mast bumping event could not be determined due to postaccident damage.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=CEN12FA001) · AI Analytics · CC0 1.0*