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NTSB Report
July 29, 1992 · Cessna P210N · N6503W
Mineral Point, WI
Overview
Report Status
Probable Cause
Event Type
Accident
Date
July 29, 1992
Injury Outcomes
2 injuries (2 fatalities)
Location
Mineral Point, WI
Aircraft
Cessna P210N
Tail Number
N6503W
Operator
Jeanal Enterprises
Injuries
Fatal
Aircraft Damage
Substantial
NTSB Number
CHI92FA215
THE PILOT REPORTED A LOSS OF ENGINE POWER AND DECLARED AN EMERGENCY. ATC ISSUED VECTORS TO THE NEAREST AIRPORT, WHICH WAS ABOUT TEN MILES AWAY. THE PILOT THEN ADVISED ATC HE LOST THE PROPELLER. ABOUT 3 MINUTES AFTER THE EMERGENCY WAS DECLARED, THE PILOT REPORTED 'I HAVE THE FIELD....DON'T THINK I'M GOING TO MAKE IT.' THE AIRPLANE IMPACTED TERRAIN ABOUT 1.5 MILES EAST OF THE AIRPORT. POST-ACCIDENT INVESTIGATION REVEALED THE CRANKSHAFT WAS SEPARATED IN TWO LOCATIONS AND THE NO. 2 MAIN BEARING HAD SHIFTED IN THE JOURNAL. METALLURGICAL EXAMINATION REVEALED ONE FRACTURE WAS DETERMINED TO BE DUE TO OVERSTRESS AND EXCESSIVE TORSIONAL LOADS. THE OTHER FRACTURE '...CONTAINED A WELL DEFINED CRACK ARREST PATTERN INDICATIVE OF A HIGH CYCLE FATIGUE CRACK. EXAMINATION OF THE CRANKCASE HALVES REVEALED EVIDENCE OF FRETTING AT THE MATING SURFACES.
NTSB Probable Cause
THE PILOT'S INADVERTENT STALL AND DESCENT INTO TERRAIN DURING A FORCED LANDING. RELATED FACTORS ARE THE MANUFACTURER'S UNDERTORQUED CRANKCASE HALVES AND INADEQUATE SURVEILLANCE, THE PILOT'S DELAY IN SETTING UP THE PROPER DESCENT RATE, AND THE ALTERED AIRCRAFT PERFORMANCE WITH THE SEPARATED PROPELLER ASSEMBLY.
Full Narrative
THE PILOT REPORTED A LOSS OF ENGINE POWER AND DECLARED AN EMERGENCY. ATC ISSUED VECTORS TO THE NEAREST AIRPORT, WHICH WAS ABOUT TEN MILES AWAY. THE PILOT THEN ADVISED ATC HE LOST THE PROPELLER. ABOUT 3 MINUTES AFTER THE EMERGENCY WAS DECLARED, THE PILOT REPORTED 'I HAVE THE FIELD....DON'T THINK I'M GOING TO MAKE IT.' THE AIRPLANE IMPACTED TERRAIN ABOUT 1.5 MILES EAST OF THE AIRPORT. POST-ACCIDENT INVESTIGATION REVEALED THE CRANKSHAFT WAS SEPARATED IN TWO LOCATIONS AND THE NO. 2 MAIN BEARING HAD SHIFTED IN THE JOURNAL. METALLURGICAL EXAMINATION REVEALED ONE FRACTURE WAS DETERMINED TO BE DUE TO OVERSTRESS AND EXCESSIVE TORSIONAL LOADS. THE OTHER FRACTURE '...CONTAINED A WELL DEFINED CRACK ARREST PATTERN INDICATIVE OF A HIGH CYCLE FATIGUE CRACK. EXAMINATION OF THE CRANKCASE HALVES REVEALED EVIDENCE OF FRETTING AT THE MATING SURFACES.
Flight
Event TypeAccident
Event Time14:33 CDT
Nearest AirportIowa County (1nm E)
Runway0
Flight Plan FiledIFR
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftCessna P210N
Tail NumberN6503W
Aircraft CategoryAir
DamageSubstantial
OperatorJeanal Enterprises
Operating RulePart 91
Engines1
Engine TypeReciprocating
Engine DetailsContinental · TSIO-520-AF · Reciprocating · 310
Seats6
People & Injuries
Injury Summary2 injuries (2 fatalities)
Fatal2
Serious0
Minor0
Uninjured0
Total2
Crew 1Age 49 · Third Class
Conditions
ConditionsVMC
LightDaylight
Wind350° @ 6 kt
Visibility10 sm
CeilingOvercast 25000 ft
Temperature / Dew Point55
Altimeter30.00 inHg
Observation Time19:55
Weather SourceWFAC