# NTSB Accident WPR17LA168
> **ROBINSON HELICOPTER COMPANY R44 II** · 2017-07-25 · Lake Sutherlin, MT, USA · NONE
## Event
- **NTSB number:** WPR17LA168
- **Event ID:** 20170725X13055
- **Type:** Accident
- **Date:** 2017-07-25
- **Location:** Lake Sutherlin, MT, USA
- **Coordinates:** 46.635276, -110.735275
## Injuries
- **Highest injury:** NONE
- **Fatal:** 0
- **Serious:** 0
- **Minor:** 0
- **Uninjured:** 2
- **Total aboard:** 2
## Aircraft
- **Make:** ROBINSON HELICOPTER COMPANY
- **Model:** R44 II
- **Registration:** N233JD
- **FAR Part:** 091
- **Engines:** 1
- **Damage:** SUBS
## Conditions
- **Light:** DAYL
- **Weather:** VMC
## Probable cause

The pilot’s transition into an out-of-ground-effect hover in high-density altitude conditions that exceeded the helicopter’s performance capabilities, which resulted in loss of rotor rpm.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=WPR17LA168) · AI Analytics · CC0 1.0*