# NTSB Accident FTW89DPJ08
> **GRUMMAN G-164** · 1989-07-08 · GUYMON, OK, USA · SERS
## Event
- **NTSB number:** FTW89DPJ08
- **Event ID:** 20001213X28820
- **Type:** Accident
- **Date:** 1989-07-08
- **Location:** GUYMON, OK, USA
- **Coordinates:** 36.679283, -101.479171
## Injuries
- **Highest injury:** SERS
- **Fatal:** 0
- **Serious:** 1
- **Minor:** 0
- **Uninjured:** 0
- **Total aboard:** 1
## Aircraft
- **Make:** GRUMMAN
- **Model:** G-164
- **Registration:** N788Y
- **FAR Part:** 137
- **Engines:** 1
- **Damage:** SUBS
## Conditions
- **Light:** DAYL
- **Weather:** VMC
## Probable cause

FAILURE OF THE UPPER RIGHT ENGINE MOUNT (FIREWALL ATTACH BOLT) DUE TO FATIGUE, AND FAILURE OF THE LOWER RIGHT MOUNTING BOLT FOR AN UNKNOWN REASON, WHICH ALLOWED OVERLOAD FAILURE OF THE TWO REMAINING MOUNTING BOLTS AND SEPARATION OF THE ENGINE.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=FTW89DPJ08) · AI Analytics · CC0 1.0*