# NTSB Incident DEN92IA074
> **EMBRAER EMB-120 RT** · 1992-07-21 · DENVER, CO, USA · NONE
## Event
- **NTSB number:** DEN92IA074
- **Event ID:** 20001211X15130
- **Type:** Incident
- **Date:** 1992-07-21
- **Location:** DENVER, CO, USA
- **Coordinates:** 39.760925, -104.920112
## Injuries
- **Highest injury:** NONE
- **Fatal:** 0
- **Serious:** 0
- **Minor:** 0
- **Uninjured:** 26
- **Total aboard:** 26
## Aircraft
- **Make:** EMBRAER
- **Model:** EMB-120 RT
- **Registration:** N221YV
- **FAR Part:** 135
- **Engines:** 2
- **Damage:** —
## Conditions
- **Light:** DAYL
- **Weather:** VMC
## Probable cause

OPEN AIR GROUND CIRCUIT BREAKERS THAT ALLOWED THE PROPELLERS TO OVERSPEED. A FACTOR WAS:  CLEAR AIR TURBULENCE.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=DEN92IA074) · AI Analytics · CC0 1.0*