# NTSB Incident DEN93IA005
> **MCDONNELL DOUGLAS DC-9-82** · 1992-10-13 · DENVER, CO, USA · NONE
## Event
- **NTSB number:** DEN93IA005
- **Event ID:** 20001211X15850
- **Type:** Incident
- **Date:** 1992-10-13
- **Location:** DENVER, CO, USA
- **Coordinates:** 39.760784, -104.920364
## Injuries
- **Highest injury:** NONE
- **Fatal:** 0
- **Serious:** 0
- **Minor:** 0
- **Uninjured:** 88
- **Total aboard:** 88
## Aircraft
- **Make:** MCDONNELL DOUGLAS
- **Model:** DC-9-82
- **Registration:** N72822
- **FAR Part:** 121
- **Engines:** 2
- **Damage:** MINR
## Conditions
- **Light:** NBRT
- **Weather:** VMC
## Probable cause

AN INADVERTENT ATTEMPT, BY UNKNOWN PERSONS, TO START THE APU WHICH HAD BEEN PLACARDED AS INOPERATIVE.  FACTORS WERE: INADEQUATE PROCEDURES IN RENDERING THE APU INCAPABLE OF BEING STARTED WHEN INOPERATIVE.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=DEN93IA005) · AI Analytics · CC0 1.0*