NTSB Identification: CHI85LA260.
The docket is stored on NTSB microfiche number 28069.
Accident occurred Wednesday, June 19, 1985 in ROSEAU, MN
Aircraft: STINSON 108-1, registration: N9070K
Injuries: 1 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 INTENTIONALLY GROUND LOOPED THE ACFT DURING A FORCED LANDING TO AVOID OBSTACLES FOLLOWING A LOSS OF POWER EN ROUTE. APRX 1 1/2 HRS INTO THE FLT THE PLT NOTICED AN ENGINE ROUGHNESS FOLLOWED BY AN INCREASE IN OIL TEMP WHICH RETURNED TO NORMAL SHORTLY THEREAFTER. ABOUT 1 HR LATER, A 25 RPM DECREASE AND ENGINE ROUGHNESS WAS EXPERIENCED. A CONTINUED DECREASE IN RPM WAS EXPERIENCED THROUGHOUT THE NEXT 1/2 HR AND THE PLT LEANED THE MIXTURE AND TURNED THE CARB HEAT ON AND OFF IN AN ATTEMPT TO REGAIN POWER. A TOTAL LOSS OF POWER WAS THEN EXPERIENCED AND THE FORCED LANDING WAS INITIATED. AN ICING PROBABILITY CHART INDICATES THE EXISTING TEMP (70 DEGS F) AND THE DEW POINT (55 DEGS F) WHERE CONDUCIVE TO CARB ICE. NO MECHANICAL FAILURE/MALFUNCTION WAS FOUND.

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

IN-FLIGHT PLANNING/DECISION..IMPROPER..PILOT IN COMMAND


Contributing Factors

WEATHER CONDITION..CARBURETOR ICING CONDITIONS


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