ASN Wikibase Occurrence # 363746
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| Date: | Tuesday 21 April 1992 |
| Time: | 19:45 LT |
| Type: |  Beechcraft B36TC |
| Owner/operator: | Private |
| Registration: | N7252X |
| MSN: | EA-450 |
| Year of manufacture: | 1985 |
| Total airframe hrs: | 1248 hours |
| Engine model: | CONTINENTAL TSIO-520-UB |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Mona, UT -
 United States of America
|
| Phase: | En route |
| Nature: | Private |
| Departure airport: | Mt Carmel, UT |
| Salt Lake City, UT (KSLC) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
DURING A CROSS COUNTRY FLIGHT, THE PILOT REPORTED THAT THE ENGINE LOST POWER WHILE IN CRUISE FLIGHT. THE PILOT DECLARED AN EMERGENCY AND INITIATED A FORCED LANDING TO AN OPEN FIELD. DURING THE LANDING ROLL, THE AIRPLANE COLLIDED WITH A DITCH. DURING AN ENGINE EXAMINATION, IT WAS FOUND THAT THE CRANKSHAFT WAS BROKEN BETWEEN THE NUMBER TWO MAIN JOURNAL, EXTENDING TO THE NUMBER TWO MAIN JOURNAL CHEEK AND NUMBER TWO CONNECTING ROD JOURNAL. A METALLURGICAL EXAMINATION REVEALED AN OCCLUDED MATERIAL WHICH APPEARED TO BE OXIDES OR OTHER NON METALLIC INCLUSIONS PRODUCED DURING THE MANUFACTURE OF THE METAL PRIOR TO FORGING. THE METALLURGICAL REPORT STATED,'THESE OXIDES MOST LIKELY PROVIDED STRESS RISERS WHICH CONCENTRATED STRESSES IN THE CRANKSHAFT TO DEVELOP CRACKS UNDER CYCLIC LOADING.' THE CRACKS PROPAGATED UNTIL FAILURE OCCURRED.
Probable Cause: A FATIGUE FAILURE TO THE CRANKSHAFT AND A MANUFACTURING MATERIAL DEFECT.
Accident investigation:
 |
|
Sources:
NTSB SEA92LA082
History of this aircraft
Other occurrences involving this aircraft
| 15 January 2004 | N7252X | Private | 1 | Willow Park, TX | |
w/o |
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 18-Mar-2024 20:35 | ASN Update Bot | Added |
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