# NTSB Accident ANC09GA040
> **ROBINSON HELICOPTER R44** · 2009-05-12 · Iliamna, AK, USA · NONE
## Event
- **NTSB number:** ANC09GA040
- **Event ID:** 20090513X60228
- **Type:** Accident
- **Date:** 2009-05-12
- **Location:** Iliamna, AK, USA
- **Coordinates:** 60.071109, -156.721115
## Injuries
- **Highest injury:** NONE
- **Fatal:** 0
- **Serious:** 0
- **Minor:** 0
- **Uninjured:** 3
- **Total aboard:** 3
## Aircraft
- **Make:** ROBINSON HELICOPTER
- **Model:** R44
- **Registration:** N7196H
- **FAR Part:** PUBU
- **Engines:** 1
- **Damage:** SUBS
## Conditions
- **Light:** DAYL
- **Weather:** VMC
## Probable cause

The main rotor transmission mount design, which resulted in an in-flight vibration/oscillation, and damage to the helicopter during an emergency descent and hard landing. Contributing to the accident was the lack of information from the manufacturer regarding this known flight oscillation, and loading the helicopter beyond the forward center of gravity limit by the pilot.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=ANC09GA040) · AI Analytics · CC0 1.0*