# NTSB Accident DEN91FA072
> **BEECH C23** · 1991-05-18 · BOULDER, CO, USA · SERS
## Event
- **NTSB number:** DEN91FA072
- **Event ID:** 20001212X16977
- **Type:** Accident
- **Date:** 1991-05-18
- **Location:** BOULDER, CO, USA
- **Coordinates:** 40.020809, -105.249855
## Injuries
- **Highest injury:** SERS
- **Fatal:** 0
- **Serious:** 2
- **Minor:** 1
- **Uninjured:** 0
- **Total aboard:** 3
## Aircraft
- **Make:** BEECH
- **Model:** C23
- **Registration:** N6AL
- **FAR Part:** 091
- **Engines:** 1
- **Damage:** SUBS
## Conditions
- **Light:** DAYL
- **Weather:** VMC
## Probable cause

INADVERTENT STALL/MUSH DUE TO THE PASSENGERS'S DELAY IN RELINQUISHING AIRCRAFT CONTROL, AND INADEQUATE SUPERVISION OF THE FLIGHT BY THE PILOT IN COMMAND.  FACTORS WERE:  MIXTURE NOT LEANED, AND A HIGH DENSITY ALTITUDE TAKEOFF WITH A SLIGHT QUARTERING TAILWIND.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=DEN91FA072) · AI Analytics · CC0 1.0*