# NTSB Incident DEN03IA147
> **Beech 1900D** · 2003-08-24 · Denver, CO, USA · NONE
## Event
- **NTSB number:** DEN03IA147
- **Event ID:** 20030826X01395
- **Type:** Incident
- **Date:** 2003-08-24
- **Location:** Denver, CO, USA
- **Coordinates:** 39.858612, -104.666946
## Injuries
- **Highest injury:** NONE
- **Fatal:** 0
- **Serious:** 0
- **Minor:** 0
- **Uninjured:** 16
- **Total aboard:** 16
## Aircraft
- **Make:** Beech
- **Model:** 1900D
- **Registration:** N192GL
- **FAR Part:** 121
- **Engines:** 2
- **Damage:** MINR
## Conditions
- **Light:** DUSK
- **Weather:** VMC
## Probable cause

the first officer's improper preflight preparation in failing to ensure the cabin airstair door was fully locked and secure.  Factors relating to the incident were the cabin airstair door handle not being fully secure and the forward cabin door warning light not illuminating until the airplane was in flight.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=DEN03IA147) · AI Analytics · CC0 1.0*