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NTSB Report
October 8, 1991 · Cessna 150M · N704CW
Marion, WI
Overview
Report Status
Probable Cause
Event Type
Accident
Date
October 8, 1991
Injury Outcomes
No injuries (1 uninjured)
Location
Marion, WI
Aircraft
Cessna 150M
Tail Number
N704CW
Operator
James H Jahnke
Injuries
None
Aircraft Damage
Substantial
NTSB Number
CHI92LA003
THE STUDENT PILOT WAS FLYING A SINGLE ENGINE AIRPLANE ON A SOLO CROSS COUNTRY FLIGHT WHEN THE ENGINE BEGAN TO RUN ROUGH. THE ENGINE LOST APPROXIMATELY 25 PERCENT OF THE ORIGINAL POWER SETTING. THE AIRPLANE WOULD NOT MAINTAIN ALTITUDE AND WAS, ACCORDING TO THE PILOT, 'VIBRATING VERY BADLY.' THE PILOT CHOSE A FIELD WHICH HE BELIEVED SMOOTH AND LEVEL. UPON TOUCHDOWN THE AIRPLANE ROLLED DOWN HILL AND NOSED OVER AT THE BOTTOM OF THE HILL AFTER ITS NOSEGEAR COLLAPSED. INSPECTION OF THE ENGINE REVEALED FAILED INTAKE AND EXHAUST VALVES, AND A PISTON WITH HOLES IN ITS TOP. THE AIRPLANE WAS OPERATING UNDER AND AUTO GAS STC WHICH ALLOWED THE USE OF THAT FUEL AND ANY MIXTURE COMBINATION OF 100 LL AVIATION FUEL.
NTSB Probable Cause
THE FAILURE OF THE EXHAUST AND INTAKE VALVES. FACTORS CONTRIBUTING TO THE ACCIDENT WERE DOWNHILL TERRAIN AND A COLLAPSED NOSEGEAR.
Full Narrative
THE STUDENT PILOT WAS FLYING A SINGLE ENGINE AIRPLANE ON A SOLO CROSS COUNTRY FLIGHT WHEN THE ENGINE BEGAN TO RUN ROUGH. THE ENGINE LOST APPROXIMATELY 25 PERCENT OF THE ORIGINAL POWER SETTING. THE AIRPLANE WOULD NOT MAINTAIN ALTITUDE AND WAS, ACCORDING TO THE PILOT, 'VIBRATING VERY BADLY.' THE PILOT CHOSE A FIELD WHICH HE BELIEVED SMOOTH AND LEVEL. UPON TOUCHDOWN THE AIRPLANE ROLLED DOWN HILL AND NOSED OVER AT THE BOTTOM OF THE HILL AFTER ITS NOSEGEAR COLLAPSED. INSPECTION OF THE ENGINE REVEALED FAILED INTAKE AND EXHAUST VALVES, AND A PISTON WITH HOLES IN ITS TOP. THE AIRPLANE WAS OPERATING UNDER AND AUTO GAS STC WHICH ALLOWED THE USE OF THAT FUEL AND ANY MIXTURE COMBINATION OF 100 LL AVIATION FUEL.
Flight
Event TypeAccident
Event Time12:20 CDT
Nearest Airport0nm N
Runway0
Flight Plan FiledVFR
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftCessna 150M
Tail NumberN704CW
Aircraft CategoryAir
DamageSubstantial
OperatorJames H Jahnke
Operating RulePart 91
Engines1
Engine TypeReciprocating
Engine DetailsContinental · O-200 A · Reciprocating · 100
Seats2
People & Injuries
Injury SummaryNo injuries (1 uninjured)
Fatal0
Serious0
Minor0
Uninjured1
Total1
Crew 1Age 37 · Third Class
Conditions
ConditionsVMC
LightDaylight
Wind220° @ 13 kt
Visibility10 sm
CeilingBroken clouds 1700 ft
Temperature / Dew Point0 C / 0 C
Altimeter0
Observation Time18:50
Weather SourceWFAC