NTSB Identification: SEA86LA024.
The docket is stored on NTSB microfiche number 29352.
Accident occurred Saturday, November 16, 1985 in IDAHO FALLS, ID
Aircraft: CESSNA 421C, registration: N124RS
Injuries: 5 Uninjured.

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

DURING INITIAL APCH INFLIGHT ICING WAS ENCOUNTERED. THE WINDSCREEN FAILED TO HEAT DUE TO AN INOPERATIVE INVERTER. A SMALL AREA ON THE RIGHT BOTTOM PORTION OF THE WINDSCREEN DE-ICED DUE TO DEFROST HEAT. THE PLT ELECTED TO LAND USING THE SMALL CLEAR AREA OF THE WINDSCREEN FOR OUTSIDE REFERENCE. A HARD LANDING RESULTED FROM A LOSS OF DEPTH PERCEPTION.

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

WEATHER EVALUATION..DISREGARDED..PILOT IN COMMAND

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

ANTI-ICE/DEICE SYSTEM,WINDSHIELD..INOPERATIVE

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

VISUAL/AURAL PERCEPTION..PILOT IN COMMAND


Contributing Factors

WINDOW,FLIGHT COMPARTMENT WINDOW/WINDSHIELD..ICE

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