# NTSB Accident DEN91FA056
> **CESSNA 421C** · 1991-03-29 · CORTEZ, CO, USA · FATL
## Event
- **NTSB number:** DEN91FA056
- **Event ID:** 20001212X16587
- **Type:** Accident
- **Date:** 1991-03-29
- **Location:** CORTEZ, CO, USA
- **Coordinates:** 37.350418, -108.569572
## Injuries
- **Highest injury:** FATL
- **Fatal:** 5
- **Serious:** 0
- **Minor:** 0
- **Uninjured:** 0
- **Total aboard:** 5
## Aircraft
- **Make:** CESSNA
- **Model:** 421C
- **Registration:** N3851C
- **FAR Part:** 091
- **Engines:** 2
- **Damage:** DEST
## Conditions
- **Light:** DAYL
- **Weather:** IMC
## Probable cause

THE PILOT'S IMPROPER IFR PROCEDURES.  FACTORS WERE:  THE EXISTING WEATHER CONDITIONS AND THE PILOT'S FAILURE TO OBTAIN A PREFLIGHT BRIEFING.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=DEN91FA056) · AI Analytics · CC0 1.0*