ASN Wikibase Occurrence # 354291
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| Date: | Friday 19 June 1998 |
| Time: | 20:25 LT |
| Type: |  Cessna 207 |
| Owner/operator: | Inland Aviation Services Inc. |
| Registration: | N1673U |
| MSN: | 20700273 |
| Year of manufacture: | 1974 |
| Total airframe hrs: | 11877 hours |
| Engine model: | Continental IO-520-F |
| Fatalities: | Fatalities: 0 / Occupants: 4 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Holy Cross, AK -
 United States of America
|
| Phase: | En route |
| Nature: | Unknown |
| Departure airport: | Grayling, AK (KGX) |
| Bethel, AK (BET) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The pilot and three passengers, departed on an air taxi flight over remote terrain. While in cruise flight about 2,200 feet, the engine oil pressure began to drop, and the engine oil temperature began to rise. The pilot decided to divert to the nearest airport. The engine quit running, and the pilot selected an emergency landing area on a sand bar along a river that contained several willow trees. During the landing, the airplane received damage to the wings and fuselage. The engine had accrued 1,491 hours since an overhaul. During that time, seven engine cylinder changes were performed by company maintenance personnel. An examination of the engine revealed the crankshaft was broken along the aft, lower edge of the number two cheek journal, at the forward radius of the number two main bearing journal. The fracture line was straight and flat, through the full dimension of the number two cheek journal, and was oriented perpendicular to the longitudinal axis of the crankshaft. The number two main bearing was broken and flattened. The number two main bearing saddle was flattened and distorted. The left and right engine case halves mating surface exhibited galling/fretting at the number two main journal bolt holes.
Probable Cause: The improper installation/undertorquing of the engine crankcase bolts by company maintenance personnel, and a subsequent fracture of the engine crankshaft. A factor in the accident was unsuitable terrain for a forced landing.
Accident investigation:
 |
|
Sources:
NTSB ANC98LA078
History of this aircraft
Other occurrences involving this aircraft
| 29 November 2011 | N1673U | Inland Aviation | 1 | 2 miles SW of Chuathbaluk Airport (PACH), Chuathbaluk, AK | |
sub |
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 11-Mar-2024 12:46 | ASN Update Bot | Added |
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