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| Date: | Saturday 18 November 1995 |
| Time: | 14:30 LT |
| Type: |  Cessna 207 |
| Owner/operator: | Mark Air Express |
| Registration: | N70076 |
| MSN: | 20700547 |
| Total airframe hrs: | 12220 hours |
| Engine model: | Continental IO-520-F |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Other fatalities: | 0 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Aniak, AK -
 United States of America
|
| Phase: | En route |
| Nature: | Ferry/positioning |
| Departure airport: | Bethel, AK (BET) |
| Anchorage, AK (ANC | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
During cruise flight, the pilot noted a loss in engine RPM and oil pressure at the same time. He performed an emergency landing on a frozen lake. During the landing roll, the right wingtip struck a spruce tree, and the airplane was substantially damaged. During an examination, the accessory section of the engine did not rotate, when the propeller was turned by hand. A teardown of the engine revealed that the crankshaft was fractured at the number 3 short cheek, between the number 2 rod bearing and the number 2 main bearing. The engine contained numerous fragments from the number 2 main bearing. The number 2 bearing saddle was severely worn and deformed. Other bearing saddles exhibited scoring. A metallurgical examination of the crankshaft revealed a fatigue failure at the aft radius of the number 2 main bearing journal adjacent to heavy rubbing marks from the number 2 main bearing.
Probable Cause: fatigue failure of the engine crankshaft at the number 2 main bearing journal, where rubbing contact had occurred with the number 2 main bearing. A factor relating to the accident was: the lack of suitable terrain for an emergency landing.
Accident investigation:
 |
|
Sources:
NTSB ANC96LA017
History of this aircraft
Other occurrences involving this aircraft
| 15 October 1984 | N70076 | Wings Of Alaska | 0 | Juneau, AK | |
sub |
| 12 December 1988 | N70076 | Dick Nelson | 0 | Napaskiak, AK | |
sub |
| 15 January 1992 | N70076 | Markair Express | 0 | Port Moller, AK | |
min |
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 14-Mar-2024 09:05 | ASN Update Bot | Added |
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