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Status Accident investigation report completed and information captured
Date Wednesday 29 July 1992
Time 15:33 LT
Type Silhouette image of generic P210 model; specific model in this crash may look slightly different    
Cessna P210N
Operator Jeanal Enterprises, Inc.
Registration N6503W
MSN P21000789
Year of manufature
Engines Continental TSIO-520-AF
Crew Fatalities: / Occupants:
Passengers Fatalities: / Occupants:
Total occupants Fatalities: 2 / Occupants: 2
Aircraft damage Substantial
Location Mineral Point, WI   United States of America
Phase Unknown
Nature Private
Departure Airport Des Moines, IA (KDSM)
Destination Airport Oshkosh, WI (KOSH)
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.

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.

sources

NTSB CHI92FA215

ACCIDENT INVESTIGATION

Final report

Investigating agency: NTSB

Report nr: CHI92FA215

Duration: 12 months

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Revision History

Date/time Contributor Updates
24-Oct-2008 10:30 ASN archive Added
21-Dec-2016 19:23 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]
10-Apr-2024 19:14 ASN Update Bot Updated [Time, Operator, Other fatalities, Phase, Departure airport, Destination airport, Source, Narrative, Category, Accident report]

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