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NTSB Report
June 20, 1985 · Stinson 108-1 · N9070K
Roseau, MN
Overview
Report Status
Preliminary report
Event Type
Accident
Date
June 20, 1985
Injury Outcomes
No injuries (1 uninjured)
Location
Roseau, MN
Aircraft
Stinson 108-1
Tail Number
N9070K
Injuries
None
Aircraft Damage
Substantial
NTSB Number
CHI85LA260
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.
Full Narrative
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.
Flight
Event TypeAccident
Event Time20:15 CDT
Nearest Airport0nm N
Runway0
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftStinson 108-1
Tail NumberN9070K
Aircraft CategoryAir
DamageSubstantial
Operating RulePart 91
Engines1
Engine TypeReciprocating
Engine DetailsFranklin · 150 · Reciprocating · 150
Seats4
People & Injuries
Injury SummaryNo injuries (1 uninjured)
Fatal0
Serious0
Minor0
Uninjured1
Total1
Crew 1Age 52 · Third Class
Conditions
ConditionsVMC
LightDaylight
WindCalm
Visibility10 sm
CeilingNone
Temperature / Dew Point70 F / 55
Altimeter0
Observation Time20:15
Weather SourcePILO