# NTSB Accident DEN91LA137
> **RAVEN RALLEY RX7** · 1991-09-21 · ENGLEWOOD, CO, USA · NONE
## Event
- **NTSB number:** DEN91LA137
- **Event ID:** 20001212X18092
- **Type:** Accident
- **Date:** 1991-09-21
- **Location:** ENGLEWOOD, CO, USA
- **Coordinates:** 39.540466, -104.959022
## Injuries
- **Highest injury:** NONE
- **Fatal:** 0
- **Serious:** 0
- **Minor:** 0
- **Uninjured:** 2
- **Total aboard:** 2
## Aircraft
- **Make:** RAVEN
- **Model:** RALLEY RX7
- **Registration:** N4036Y
- **FAR Part:** 091
- **Engines:** 0
- **Damage:** SUBS
## Conditions
- **Light:** DAYL
- **Weather:** VMC
## Probable cause

A HARD LANDING AND INADVERTENT DEPLOYMENT OF THE BALLOON HEATER. A FACTOR WAS: INADVERTENT ENTANGLEMENT OF A LOAD CABLE WITH THE HEATER ACTIVATION DEVICE.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=DEN91LA137) · AI Analytics · CC0 1.0*