# NTSB Incident CHI92IA061
> **MCDONNELL DOUGLAS DC-10-30** · 1991-12-23 · CHICAGO, IL, USA · NONE
## Event
- **NTSB number:** CHI92IA061
- **Event ID:** 20001212X18554
- **Type:** Incident
- **Date:** 1991-12-23
- **Location:** CHICAGO, IL, USA
## Injuries
- **Highest injury:** NONE
- **Fatal:** 0
- **Serious:** 0
- **Minor:** 0
- **Uninjured:** 315
- **Total aboard:** 315
## Aircraft
- **Make:** MCDONNELL DOUGLAS
- **Model:** DC-10-30
- **Registration:** N142AA
- **FAR Part:** 121
- **Engines:** 3
- **Damage:** —
## Conditions
- **Light:** DAYL
- **Weather:** VMC
## Probable cause

THE LOCAL CONTROLLER'S NOT UNDERSTANDING READ BACK OF RADIO COMMUNICATIONS.  FACTORS INCLUDE THE PILOT-IN-COMMAND OF FLIGHT 73 NOT UNDERSTANDING VERBAL INSTRUCTIONS; LOCAL CONTROLLER NOT VISUALLY IDENTIFYING THE AIRCRAFT; AND INADEQUATE SURVEILLANCE (FAA) IN THE TOWER.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=CHI92IA061) · AI Analytics · CC0 1.0*