# NTSB Accident NYC92GA089
> **MCDONNELL DOUGLAS 500E** · 1992-04-30 · MOUNT ZION, KY, USA · NONE
## Event
- **NTSB number:** NYC92GA089
- **Event ID:** 20001211X14498
- **Type:** Accident
- **Date:** 1992-04-30
- **Location:** MOUNT ZION, KY, USA
- **Coordinates:** 38.779434, -84.599685
## Injuries
- **Highest injury:** NONE
- **Fatal:** 0
- **Serious:** 0
- **Minor:** 0
- **Uninjured:** 3
- **Total aboard:** 3
## Aircraft
- **Make:** MCDONNELL DOUGLAS
- **Model:** 500E
- **Registration:** N97BR
- **FAR Part:** 091
- **Engines:** 1
- **Damage:** SUBS
## Conditions
- **Light:** DAYL
- **Weather:** VMC
## Probable cause

AN IN-FLIGHT SEPARATION OF THE TAIL ROTOR ASSEMBLY AS THE RESULT OF THE LOSS OF AN ABRASION STRIP FROM THE LEADING EDGE OF ONE OF THE TAIL ROTOR BLADES, WHICH INDUCED VIBRATIONAL STRESSES HIGH ENOUGH TO INITIATE FATIGUE FAILURE IN THE TAIL ROTOR GEAR BOX MOUNTING STUDS.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=NYC92GA089) · AI Analytics · CC0 1.0*