# NTSB Accident CHI94FA140
> **VAVRA, MARTIN A. REBEL 300** · 1994-04-23 · WONDERLAKE, IL, USA · FATL
## Event
- **NTSB number:** CHI94FA140
- **Event ID:** 20001206X01069
- **Type:** Accident
- **Date:** 1994-04-23
- **Location:** WONDERLAKE, IL, USA
- **Coordinates:** 42.340232, -88.030372
## Injuries
- **Highest injury:** FATL
- **Fatal:** 1
- **Serious:** 0
- **Minor:** 0
- **Uninjured:** 0
- **Total aboard:** 1
## Aircraft
- **Make:** VAVRA, MARTIN A.
- **Model:** REBEL 300
- **Registration:** N12MV
- **FAR Part:** 091
- **Engines:** 1
- **Damage:** DEST
## Conditions
- **Light:** DAYL
- **Weather:** VMC
## Probable cause

FATIGUE AND CATASTROPHIC FAILURE OF THE MAIN WING SPAR RESULTING FROM THE DESIGNER'S EXCESSIVE, UNVERIFIED ESTIMATE OF THE STRENGTH OF THE SPAR CAP MATERIAL AND THE MANUFACTURER'S FAILURE TO ATTAIN THE SPECIFIED STRENGTH DURING THE PRODUCTION PROCESS.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=CHI94FA140) · AI Analytics · CC0 1.0*