# NTSB Accident MIA90FA190
> **Ayres S2R-T34** · 1990-09-26 · THORNTON, MS, USA · FATL
## Event
- **NTSB number:** MIA90FA190
- **Event ID:** 20001212X24323
- **Type:** Accident
- **Date:** 1990-09-26
- **Location:** THORNTON, MS, USA
## Injuries
- **Highest injury:** FATL
- **Fatal:** 1
- **Serious:** 0
- **Minor:** 0
- **Uninjured:** 0
- **Total aboard:** 1
## Aircraft
- **Make:** Ayres
- **Model:** S2R-T34
- **Registration:** N4017B
- **FAR Part:** 137
- **Engines:** 1
- **Damage:** DEST
## Conditions
- **Light:** DAYL
- **Weather:** VMC
## Probable cause

THE IMPROPER DRILLING OF A HOLE IN THE SPAR CAP BY A MECHANIC RESULTING IN THE INITIATION OF FATIGUE CRACKING IN THE SPAR CAP AND SUBSEQUENT FAILURE OF THE SPAR CAP AND INFLIGHT SEPARATION OF THE WING.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=MIA90FA190) · AI Analytics · CC0 1.0*