# NTSB Incident CHI89IA179
> **BOEING 767-231** · 1989-09-05 · KNOX, IN, USA · MINR
## Event
- **NTSB number:** CHI89IA179
- **Event ID:** 20001213X29317
- **Type:** Incident
- **Date:** 1989-09-05
- **Location:** KNOX, IN, USA
- **Coordinates:** 41.289653, -86.620162
## Injuries
- **Highest injury:** MINR
- **Fatal:** 0
- **Serious:** 0
- **Minor:** 6
- **Uninjured:** 156
- **Total aboard:** 162
## Aircraft
- **Make:** BOEING
- **Model:** 767-231
- **Registration:** N608TW
- **FAR Part:** 121
- **Engines:** 2
- **Damage:** —
## Conditions
- **Light:** DAYL
- **Weather:** IMC
## Probable cause

THE RADAR CONTROLLLER'S FAILURE TO MAINTAIN RADAR SEPARATION. FACTORS CONTRIBUTING TO THE INCIDENT WERE: MISUNDERSTANDING OF AN ATC INSTRUCTION BY THE PILOT OF THE INCIDENT AIRPLANE, AND UNCLEAR PHRASEOLOGY USED IN THE INSTRUCTIONS ISSUED BY THE RADAR CONTROLLER.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=CHI89IA179) · AI Analytics · CC0 1.0*