NTSB Identification: DEN85LA076.
The docket is stored on NTSB microfiche number 27967.
Accident occurred Monday, February 11, 1985 in THOMPSON FALLS, MT
Aircraft: PIPER PA-18, registration: N3777P
Injuries: 3 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 ACFT NOSED OVER DURING A FORCED LNDG ON TERRAIN COVERED BY 20 INCHES OF SNOW. THE FLT WAS ON DEER SURVEY FLT THE PLT TOLD OF IMPROPER USE OF THE CARB HEAT CONTROL DURING A PERIOD OF'PERFECT' ICING CONDITIONS. THE PLTS REDUCTION OF POWER DURING MANEUVERING ALSO CONTRIBUTED TO THE BUILD UP OF ICE IN THE CARBURETOR. THE PLT WROTE IN HIS STATEMENT UNDER PREVENTATIVE RECOMMENDATIONS THAT HE SHOULD HAVE BEEN MORE AWARE OF GETTING BEHIND THE 'HEAT CURVE' OF THE ENG.

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

CARBURETOR HEAT..IMPROPER USE OF..PILOT IN COMMAND

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

PROCEDURES/DIRECTIVES..NOT FOLLOWED..PILOT IN COMMAND

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

PERFORMANCE DATA..NOT UNDERSTOOD..PILOT IN COMMAND


Contributing Factors

TERRAIN CONDITION..SNOW COVERED


Contributing Factors

WEATHER CONDITION..CARBURETOR ICING CONDITIONS

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