# NTSB Accident CEN18FA259
> **EUROCOPTER DEUTSCHLAND GMBH EC135 P1** · 2018-07-08 · Chicago, IL, USA · SERS
## Event
- **NTSB number:** CEN18FA259
- **Event ID:** 20180708X00804
- **Type:** Accident
- **Date:** 2018-07-08
- **Location:** Chicago, IL, USA
- **Coordinates:** 41.715278, -87.624443
## Injuries
- **Highest injury:** SERS
- **Fatal:** 0
- **Serious:** 3
- **Minor:** 0
- **Uninjured:** 1
- **Total aboard:** 4
## Aircraft
- **Make:** EUROCOPTER DEUTSCHLAND GMBH
- **Model:** EC135 P1
- **Registration:** N312SA
- **FAR Part:** 135
- **Engines:** 2
- **Damage:** SUBS
## Conditions
- **Light:** NITE
- **Weather:** VMC
## Probable cause

The pilot's inadvertent disabling of the No. 1 and No. 2 engines' electronic engine control systems, which resulted in engine and rotor overspeed conditions, a subsequent autorotation, and a hard landing. Contributing to the accident were the pilot's inexperience with the helicopter variant and the operator’s lack of a more robust helicopter differences training program.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=CEN18FA259) · AI Analytics · CC0 1.0*