# NTSB Accident ERA17MA316
> **EUROCOPTER DEUTSCHLAND GMBH MBB BK 117** · 2017-09-08 · Hertford, NC, USA · FATL
## Event
- **NTSB number:** ERA17MA316
- **Event ID:** 20170908X24535
- **Type:** Accident
- **Date:** 2017-09-08
- **Location:** Hertford, NC, USA
- **Coordinates:** 36.290279, -76.487503
## Injuries
- **Highest injury:** FATL
- **Fatal:** 4
- **Serious:** 0
- **Minor:** 0
- **Uninjured:** 0
- **Total aboard:** 4
## Aircraft
- **Make:** EUROCOPTER DEUTSCHLAND GMBH
- **Model:** MBB BK 117
- **Registration:** N146DU
- **FAR Part:** 135
- **Engines:** 2
- **Damage:** DEST
## Conditions
- **Light:** DAYL
- **Weather:** VMC
## Probable cause

A failure of the rear bearing in the No. 2 engine, which (1) created multiple and likely unexpected and confusing cockpit indications, resulting in the pilot's improper diagnosis and subsequent erroneous shutdown of the No. 1 engine, and (2) the resulting degraded the performance of the No. 2 engine, until it ultimately lost power. The complete loss of engine power likely occurred at an altitude and/or airspeed that was too low for the pilot to execute a successful emergency autorotative landing.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=ERA17MA316) · AI Analytics · CC0 1.0*