# NTSB Accident CEN15LA387
> **ROBINSON R44 II** · 2015-08-28 · Cheyenne, WY, USA · SERS
## Event
- **NTSB number:** CEN15LA387
- **Event ID:** 20150828X82523
- **Type:** Accident
- **Date:** 2015-08-28
- **Location:** Cheyenne, WY, USA
- **Coordinates:** 41.097221, -104.827224
## Injuries
- **Highest injury:** SERS
- **Fatal:** 0
- **Serious:** 3
- **Minor:** 3
- **Uninjured:** 0
- **Total aboard:** 6
## Aircraft
- **Make:** ROBINSON
- **Model:** R44 II
- **Registration:** N440SA
- **FAR Part:** 091
- **Engines:** 1
- **Damage:** SUBS
## Conditions
- **Light:** DAYL
- **Weather:** VMC
## Probable cause

The pilot's improper preflight performance planning, which resulted in a hard landing due to low rotor rpm while operating near maximum gross weight in high density altitude conditions.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=CEN15LA387) · AI Analytics · CC0 1.0*