# NTSB Incident CHI93IA352
> **MCDONNELL DOUGLAS DC-9-82** · 1993-09-02 · ST. LOUIS, MO, USA · NONE
## Event
- **NTSB number:** CHI93IA352
- **Event ID:** 20001211X13361
- **Type:** Incident
- **Date:** 1993-09-02
- **Location:** ST. LOUIS, MO, USA
## Injuries
- **Highest injury:** NONE
- **Fatal:** 0
- **Serious:** 0
- **Minor:** 0
- **Uninjured:** 108
- **Total aboard:** 108
## Aircraft
- **Make:** MCDONNELL DOUGLAS
- **Model:** DC-9-82
- **Registration:** N918TW
- **FAR Part:** 121
- **Engines:** 2
- **Damage:** —
## Conditions
- **Light:** NR
- **Weather:** VMC
## Probable cause

a fatigue failure of the power transfer unit caused by a material defect which resulted in a total hydraulic system failure.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=CHI93IA352) · AI Analytics · CC0 1.0*