On July 29, 1992, a Cessna P210N (registration N6503W) operated by Jeanal Enterprises, Inc. was involved in an aviation accident near Mineral Point, WI. Investigators recorded the probable cause as: 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… This summary draws on records from the U.S. National Transportation Safety Board (NTSB) historical archive.
A pilot declared an emergency after losing engine power. Despite ATC vectors to a nearby airport, the aircraft impacted terrain about 1.5 miles east. Post-accident examination found a separated crankshaft and fatigue cracking.
Incident Summary
The pilot reported a loss of engine power and declared an emergency. Air traffic control issued vectors to the nearest airport, approximately ten miles from the aircraft's location. The pilot then advised ATC that the propeller had been lost. About three minutes after the emergency declaration, the pilot stated: "I have the field....Don't think I'm going to make it." The airplane subsequently impacted terrain about 1.5 miles east of the airport.
Investigation Findings
Post-accident investigation revealed that the crankshaft had separated in two locations and the No. 2 main bearing had shifted within its journal. Metallurgical examination determined that one fracture was due to overstress and excessive torsional loads. The other fracture was described as containing a well-defined crack arrest pattern indicative of a high-cycle fatigue crack. Examination of the crankcase halves showed evidence of fretting at the mating surfaces.
What happened in the 29 Jul 1992 Cessna P210N accident near Mineral Point, WI?
A pilot declared an emergency after losing engine power. Despite ATC vectors to a nearby airport, the aircraft impacted terrain about 1.5 miles east. Post-accident examination found a separated crankshaft and fatigue cracking.
What aircraft was involved and where did it happen?
The accident on 29 Jul 1992 involved a Cessna P210N, registration N6503W, operated by Jeanal Enterprises, Inc., at Mineral Point, WI.
What was the probable cause of the accident?
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.
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