NTSB Identification: SEA86LA031.
The docket is stored on NTSB microfiche number 29659.
Nonscheduled 14 CFR
Accident occurred Friday, December 27, 1985 in SPOKANE, WA
Aircraft: CESSNA 402B, registration: N4624N
Injuries: 2 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.
THE PLT REPORTED ENCOUNTERING ICING CONDITIONS DURING HIS APCH TO SPOKANE. UPON ARRIVAL, THE ACFT REMAINED AT SPOKANE FOR 30-40 MINUTES DURING WHICH FREEZING DRIZZLE AND BELOW FREEZING TEMPS EXISTED PRIOR TO AND DURING THE DEPARTURE. THE PLT DID NOT UTILIZE THE MANUALLY OPERATED ALTERNATE AIR SYSTEM ABOARD THE ACFT AND AS A RESULT, COLD, MOIST AIR WAS ENTRAINED INTO THE SUBFREEZING FILTER CHAMBERS. THE GRADUAL BLOCKAGE OF AIR FROM ICE IN THE FILTERS RESULTED IN A LOSS OF PWR ON BOTH ENGS. WITH SUFFICIENT PWR AVAILABLE THE PLT CHOSE TO EXECUTE AN INTENTIONAL FORCED LANDING. THE ACFT STRUCK AN ARPT PERIMETER FENCE DURING THE LANDING AND GROUND SLIDE.
The National Transportation Safety Board determines the probable cause(s) of this accident to be:INDUCTION AIR CONTROL/SYSTEM..BLOCKED(PARTIAL)
The National Transportation Safety Board determines the probable cause(s) of this accident to be:POWERPLANT CONTROLS..IMPROPER USE OF..PILOT IN COMMAND
The National Transportation Safety Board determines the probable cause(s) of this accident to be:WEATHER CONDITION..ICING CONDITIONS
WEATHER CONDITION..DARK NIGHT
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