# NTSB Accident ERA17LA116
> **ROBINSON HELICOPTER R44** · 2017-02-24 · Chatham, NJ, USA · SERS
## Event
- **NTSB number:** ERA17LA116
- **Event ID:** 20170224X14045
- **Type:** Accident
- **Date:** 2017-02-24
- **Location:** Chatham, NJ, USA
- **Coordinates:** 40.739444, -74.388336
## Injuries
- **Highest injury:** SERS
- **Fatal:** 0
- **Serious:** 1
- **Minor:** 1
- **Uninjured:** 0
- **Total aboard:** 2
## Aircraft
- **Make:** ROBINSON HELICOPTER
- **Model:** R44
- **Registration:** N44EK
- **FAR Part:** 091
- **Engines:** 1
- **Damage:** SUBS
## Conditions
- **Light:** NITE
- **Weather:** VMC
## Probable cause

Maintenance personnel's improper installation and inspection of the crankshaft gear bolt during major overhaul, which resulted in the crankshaft gear disengaging from the accessory gears of the engine and a subsequent loss of power.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=ERA17LA116) · AI Analytics · CC0 1.0*