# NTSB Incident CHI91IA078
> **BOEING 727-251** · 1991-01-21 · ST. PAUL, MN, USA · NONE
## Event
- **NTSB number:** CHI91IA078
- **Event ID:** 20001212X16275
- **Type:** Incident
- **Date:** 1991-01-21
- **Location:** ST. PAUL, MN, USA
- **Coordinates:** 44.879962, -93.199829
## Injuries
- **Highest injury:** NONE
- **Fatal:** 0
- **Serious:** 0
- **Minor:** 0
- **Uninjured:** 44
- **Total aboard:** 44
## Aircraft
- **Make:** BOEING
- **Model:** 727-251
- **Registration:** N295US
- **FAR Part:** 121
- **Engines:** 3
- **Damage:** MINR
## Conditions
- **Light:** NBRT
- **Weather:** VMC
## Probable cause

THE PARTIAL FAILURE OF THE AIRPLANE'S AUXILIARY POWER UNIT, AND THE INADEQUATE COMPONENT PRODUCED BY THE MANUFACTURER.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=CHI91IA078) · AI Analytics · CC0 1.0*