NTSB Identification: SEA85LA194.
The docket is stored on NTSB microfiche number 28145.
Accident occurred Saturday, August 10, 1985 in POCATELLO, ID
Aircraft: CESSNA 150F, registration: N8339G
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.

UPON ARRIVAL IN THE VICINITY OF HIS DESTINATION THE PLT COMMENCED A REDUCED PWR DESCENT WHILE IN CONDITIONS WHICH WERE CONDUCIVE TO CARBURETOR ICEING. DURING THE DESCENT THE PLT APPLIED CARBURETOR HEAT WITH A RESULTANT DROP IN RPM AND, APPREHENSIVE OF THIS CONDITION, RETURNED THE CARBURETOR HEAT TO 'OFF'. A TOTAL PWR LOSS FOLLOWED SHORTLY THEREAFTER. THE PLT THEN MANEUVERED THE ACFT TO A FORCED LANDING IN AN AGRICULTURAL FLD UNDER CONDITIONS OF DARKNESS. DURING THE APCH THE ACFT STRUCK A FENCE POST AND CAME TO REST INVERTED. THE PLT SUBSEQUENTLY REPORTED THAT HE BELIEVED THAT CARBURETOR HEAT WAS ONLY NECESSARY DURING COLD WEATHER OPERATIONS.

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

FUEL SYSTEM,CARBURETOR..ICE

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

CARBURETOR HEAT..NOT UNDERSTOOD..PILOT IN COMMAND


Contributing Factors

OBJECT..FENCE


Contributing Factors

TERRAIN CONDITION..ROUGH/UNEVEN


Contributing Factors

LIGHT CONDITION..DARK NIGHT


Contributing Factors

QUALIFICATION..FLIGHT INSTRUCTOR(ON GROUND)

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