ASN Wikibase Occurrence # 39678
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| Date: | Wednesday 29 July 1992 |
| Time: | 15:33 LT |
| Type: |  Cessna P210N |
| Owner/operator: | Jeanal Enterprises, Inc. |
| Registration: | N6503W |
| MSN: | P21000789 |
| Total airframe hrs: | 1465 hours |
| Engine model: | CONTINENTAL TSIO-520-AF |
| Fatalities: | Fatalities: 2 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Mineral Point, WI -
 United States of America
|
| Phase: | Unknown |
| Nature: | Private |
| Departure airport: | Des Moines, IA (KDSM) |
| Oshkosh, WI (KOSH) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
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.
Accident investigation:
 |
|
Sources:
NTSB CHI92FA215
Location
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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