NTSB Identification: MKC82IA169
14 CFR Part 91: General Aviation
Incident occurred Tuesday, September 07, 1982 in ST. LOUIS, MO
Probable Cause Approval Date: 09/07/1983
Aircraft: CESSNA 421C, registration: N6868D
Injuries: 3 Uninjured.

NTSB investigators used data provided by various sources and may not have traveled in support of this investigation to prepare this aircraft incident report.

PILOT REPORTED, THE FLIGHT ENCOUNTERED ICING CONDITIONS NEAR ST. LOUIS AND THE PROPELLER DE-ICE SYSTEM WAS ACTIVATED. WHEN DE-ICE SYSTEM WAS TURNED ON, FLAMES SHOT OUT FROM THE LOWER RIGHT CORNER OF THE PILOT'S INSTUMENT PANEL WHERE THE DE-ICE AMMETER IS LOCATED. THE PILOT TURNED OFF THE PROPELLER DE-ICE SWITCH AND THE FLAMES STOPPED. THE AIRCRAFT LANDED WITHOUT FURTHER INCIDENT. EXAMINATION OF THE PROPELLER DE-ICE AMMETER REVEALED THAT IT WAS SHORTED TO THE INSTUMENT PANEL. THE AMMETER HAD BEEN MOVED TO THIS LOCATION ON THE INSTRUMENT PANEL PRIOR TO THE FLIGHT.

The National Transportation Safety Board determines the probable cause(s) of this incident to be:

ANTI-ICE/DEICE SYSTEM,PROPELLER..SHORTED

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