# NTSB Accident CHI91DEP03
> **AIR COMMAND 503** · 1991-01-15 · TOMAHAWK, WI, USA · FATL
## Event
- **NTSB number:** CHI91DEP03
- **Event ID:** 20001212X16270
- **Type:** Accident
- **Date:** 1991-01-15
- **Location:** TOMAHAWK, WI, USA
- **Coordinates:** 45.470035, -89.719459
## Injuries
- **Highest injury:** FATL
- **Fatal:** 1
- **Serious:** 0
- **Minor:** 0
- **Uninjured:** 0
- **Total aboard:** 1
## Aircraft
- **Make:** AIR COMMAND
- **Model:** 503
- **Registration:** UNREG
- **FAR Part:** 091
- **Engines:** 1
- **Damage:** DEST
## Conditions
- **Light:** DAYL
- **Weather:** VMC
## Probable cause

THE PILOT-IN-COMMAND'S ABRUPT MOVEMENT OF THE FLIGHT CONTROLS WHICH RESULTED IN LOSS OF ROTOR RPM AND EVENTUAL DEPARTURE FROM CONTROLLED FLIGHT. A FACTOR CONTRIBUTING WAS ICE ACCUMULATION ON THE PILOT'S FACE RESULTING IN PILOT INCAPACITATION (VISUAL DEFICIENTY).

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=CHI91DEP03) · AI Analytics · CC0 1.0*