# NTSB Incident CHI93IA127
> **de Havilland SHD-6** · 1993-03-21 · CHICAGO, IL, USA · NONE
## Event
- **NTSB number:** CHI93IA127
- **Event ID:** 20001211X11943
- **Type:** Incident
- **Date:** 1993-03-21
- **Location:** CHICAGO, IL, USA
## Injuries
- **Highest injury:** NONE
- **Fatal:** 0
- **Serious:** 0
- **Minor:** 0
- **Uninjured:** 3
- **Total aboard:** 3
## Aircraft
- **Make:** de Havilland
- **Model:** SHD-6
- **Registration:** N374MQ
- **FAR Part:** 121
- **Engines:** 2
- **Damage:** —
## Conditions
- **Light:** DAYL
- **Weather:** VMC
## Probable cause

THE LOCAL CONTROLLER'S FAILURE TO MAINTAIN 3 MILES RADAR SEPARATION BETWEEN TWO AIRPLANES. A FACTOR RELATED TO THE INCIDENT WAS THE LOCAL CONTROLLER'S DELAY IN REMEDIAL ACTION.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=CHI93IA127) · AI Analytics · CC0 1.0*