# NTSB Accident CHI89DEM10
> **FLETCHER SONERAI-2L** · 1989-09-30 · INTERLOCHEN, MI, USA · FATL
## Event
- **NTSB number:** CHI89DEM10
- **Event ID:** 20001213X29314
- **Type:** Accident
- **Date:** 1989-09-30
- **Location:** INTERLOCHEN, MI, USA
- **Coordinates:** 44.639736, -85.829391
## Injuries
- **Highest injury:** FATL
- **Fatal:** 1
- **Serious:** 0
- **Minor:** 0
- **Uninjured:** 0
- **Total aboard:** 1
## Aircraft
- **Make:** FLETCHER
- **Model:** SONERAI-2L
- **Registration:** N76DJ
- **FAR Part:** 091
- **Engines:** 1
- **Damage:** DEST
## Conditions
- **Light:** DAYL
- **Weather:** VMC
## Probable cause

LOOSE CYLINDER DUE TO IMPROPER MAINTENANCE BY THE PILOT/OWNER, WHICH RESULTED IN OVERHEATING AND FAILURE OF THE ALUMINUM CYLINDER HEAD.  THE PRESENCE OF TREES WAS CONSIDERED TO BE A FACTOR.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=CHI89DEM10) · AI Analytics · CC0 1.0*