ASN Wikibase Occurrence # 364679
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| Date: | Sunday 18 August 1991 |
| Time: | 21:30 LT |
| Type: |  Cessna U206F |
| Owner/operator: | Evergreen Helicopters |
| Registration: | N35831 |
| MSN: | U20602744 |
| Year of manufacture: | 1975 |
| Total airframe hrs: | 3116 hours |
| Engine model: | CONTINENTAL IO-520-F |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Nimrod, OR -
 United States of America
|
| Phase: | En route |
| Nature: | Private |
| Departure airport: | Crescent Lake, OR (5S2 |
| Mcminnville, OR | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
WHILE IN CRUISE FLIGHT THE ENGINE BEGAN RUNNING ROUGH AND ULTIMATELY SEIZED. THE PILOT EXECUTED A FORCED LANDING DURING DARK NIGHT CONDITIONS ONTO ROUGH AND UNEVEN TERRAIN WITHIN A LOGGING CLEARCUT AREA. DURING THE ROLLOUT THE NOSE GEAR WAS SHEARED OFF AND THE AIRCRAFT NOSED OVER TO AN INVERTED POSITION RESULTING IN SUBSTANTIAL DAMAGE. SUBSEQUENT DISASSEMBLY OF THE ENGINE REVEALED A FATIGUE CRACK WHICH GENERATED INTO A FRACTURE OF THE CRANKSHAFT. THE CRACK WAS OBSERVED TO EMANATE FROM THE OIL TUBE PASSAGE HOLE IN THE NUMBER FOUR SHORT CHEEK OF THE CRANKSHAFT.
Probable Cause: THE FRACTURED CRANKSHAFT RESULTING IN ENGINE SEIZURE FOLLOWED BY A FORCED LANDING ON ROUGH AND UNEVEN TERRAIN RESULTING IN SEPARATION OF THE NOSE GEAR.
Accident investigation:
 |
|
Sources:
NTSB SEA91LA212
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 19-Mar-2024 17:38 | ASN Update Bot | Added |
Corrections or additions? ... Edit this accident description
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