# NTSB Incident CHI00IA009
> **McDonnell Douglas DC-9-51** · 1999-10-14 · CHICAGO, IL, USA · NONE
## Event
- **NTSB number:** CHI00IA009
- **Event ID:** 20001212X19913
- **Type:** Incident
- **Date:** 1999-10-14
- **Location:** CHICAGO, IL, USA
- **Coordinates:** 41.779682, -87.770263
## Injuries
- **Highest injury:** NONE
- **Fatal:** 0
- **Serious:** 0
- **Minor:** 0
- **Uninjured:** 105
- **Total aboard:** 105
## Aircraft
- **Make:** McDonnell Douglas
- **Model:** DC-9-51
- **Registration:** N766NC
- **FAR Part:** 121
- **Engines:** 2
- **Damage:** —
## Conditions
- **Light:** DAYL
- **Weather:** VMC
## Probable cause

The landing gear's wheel separation due to the improper installation of the wheel by company maintenance personnel using incomplete maintenance steps, and the maintenance steps not listed in the manufacturer's manual.  Factors were the airport perimeter wall and the vehicles.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=CHI00IA009) · AI Analytics · CC0 1.0*