# NTSB Accident ERA17LA163
> **ROBINSON R44** · 2017-04-20 · Orlando, FL, USA · NONE
## Event
- **NTSB number:** ERA17LA163
- **Event ID:** 20170421X02231
- **Type:** Accident
- **Date:** 2017-04-20
- **Location:** Orlando, FL, USA
- **Coordinates:** 28.45, -81.470558
## Injuries
- **Highest injury:** NONE
- **Fatal:** 0
- **Serious:** 0
- **Minor:** 0
- **Uninjured:** 3
- **Total aboard:** 3
## Aircraft
- **Make:** ROBINSON
- **Model:** R44
- **Registration:** N899GB
- **FAR Part:** 091
- **Engines:** 1
- **Damage:** SUBS
## Conditions
- **Light:** DAYL
- **Weather:** VMC
## Probable cause

A partial failure of the helicopter's engine tachometer due to the separation of one of the magnet assemblies and engine roughness, which precipitated the pilot’s initiation of an off-airport autorotation, during which he applied improper aft cyclic flight control input, which was contrary to the Pilot’s Operating Handbook. The reason for the reported engine roughness could not be determined during postaccident examination and engine test-runs.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=ERA17LA163) · AI Analytics · CC0 1.0*