# NTSB Accident CHI90FA278
> **BOEING 727-251** · 1990-09-29 · DETROIT, MI, USA · SERS
## Event
- **NTSB number:** CHI90FA278
- **Event ID:** 20001212X24215
- **Type:** Accident
- **Date:** 1990-09-29
- **Location:** DETROIT, MI, USA
## Injuries
- **Highest injury:** SERS
- **Fatal:** 0
- **Serious:** 2
- **Minor:** 2
- **Uninjured:** 128
- **Total aboard:** 132
## Aircraft
- **Make:** BOEING
- **Model:** 727-251
- **Registration:** N278US
- **FAR Part:** 121
- **Engines:** 3
- **Damage:** MINR
## Conditions
- **Light:** DAYL
- **Weather:** VMC
## Probable cause

THE INTENTIONAL ACTIVATION OF THE AUXILLARY POWER UNIT BY THE FLIGHT ENGINEER, AND THE IMPROPER EVACUATION PROCEDURES BY THE PILOT IN COMMAND. AN ASSOCIATED FACTOR IN THE ACCIDENT WAS THE APU CIRCUIT BREAKERS WERE NOT PULLED BY COMPANY MAINTENANCE PERSONNEL.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=CHI90FA278) · AI Analytics · CC0 1.0*