# NTSB Accident WPR14LA225
> **EMERY MARK ROTORWAY 162F** · 2014-06-04 · Merced, CA, USA · NONE
## Event
- **NTSB number:** WPR14LA225
- **Event ID:** 20140604X24746
- **Type:** Accident
- **Date:** 2014-06-04
- **Location:** Merced, CA, USA
- **Coordinates:** 37.310001, -120.51667
## Injuries
- **Highest injury:** NONE
- **Fatal:** 0
- **Serious:** 0
- **Minor:** 0
- **Uninjured:** 2
- **Total aboard:** 2
## Aircraft
- **Make:** EMERY MARK
- **Model:** ROTORWAY 162F
- **Registration:** N78291
- **FAR Part:** 091
- **Engines:** 1
- **Damage:** DEST
## Conditions
- **Light:** DAYL
- **Weather:** VMC
## Probable cause

The helicopter pilot/owner's decision to install a belt type not recommended by the kit manufacturer in the tail rotor drive system using the incorrect tension values, which led to the belt’s in-flight failure and the subsequent loss of tail rotor drive during a practice autorotation.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=WPR14LA225) · AI Analytics · CC0 1.0*