ASN Wikibase Occurrence # 355370
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| Date: | Monday 18 August 1997 |
| Time: | 13:00 LT |
| Type: |  Cessna TU206G |
| Owner/operator: | Private |
| Registration: | N6620Z |
| MSN: | U20606347 |
| Total airframe hrs: | 2138 hours |
| Engine model: | Continental TSIO-520M |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Edwall, WA -
 United States of America
|
| Phase: | En route |
| Nature: | Private |
| Departure airport: | Spokane, WA (KSFF) |
| Moses Lake, WA (MWH | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The private pilot stated that during climb, about 10 minutes after takeoff, he felt a strong vibration in the engine, followed by an abrupt engine stoppage a few seconds later. During the subsequent forced landing onto rolling terrain that was surrounded by obstructions, the airplane struck a fence post, hit a ditch, and flipped over. An examination of the engine revealed that the crankshaft had fractured. The fracture was the result of fatigue cracking that initiated at the surface of the aft radius of the no. 2 main bearing journal. Heavy rubbing damage in the aft radius indicated that the bearing shifted aft and scored the radius resulting in fatigue initiation at the surface. A visual inspection of the crankcase mating surfaces revealed fretting, indicating that there was relative motion between the two crankcase halves. No evidence of heat distress or lack of lubrication was found. The engine, a Continental TSIO-520, had received a 'top' overhaul about 45 operating hours before the accident.
Probable Cause: A fatigue failure of the engine crankshaft. Factors contributing to the accident were the rolling terrain, and the fence.
Accident investigation:
 |
|
Sources:
NTSB SEA97LA193
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 12-Mar-2024 11:17 | ASN Update Bot | Added |
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