ASN Wikibase Occurrence # 133569
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| Date: | Sunday 24 August 1997 |
| Time: | 17:00 LT |
| Type: |  Cessna 170 |
| Owner/operator: | Fremont, Margrette H. |
| Registration: | N3964V |
| MSN: | 18283 |
| Total airframe hrs: | 3150 hours |
| Engine model: | Continental C145-2 |
| Fatalities: | Fatalities: 0 / Occupants: 3 |
| Aircraft damage: | Destroyed |
| Category: | Accident |
| Location: | Elk City, ID -
 United States of America
|
| Phase: | En route |
| Nature: | Private |
| Departure airport: | Helena, MT (KHLN) |
| Kent, WA (S36) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
While in cruise over mountainous terrain, the pilot noticed a drop in oil pressure followed immediately by engine seizure. The pilot initiated a force landing into rugged terrain and the airplane was destroyed. Exam of the engine revealed that the no. 6 connecting rod had separated due to lack of lubrication and bearing seizure. No evidence of leaking oil was found on the underside of the airplane. The pilot stated that she checked the oil level prior to the flight and that it was adequate. The oil was last changed about one month prior to the accident. According to a maintenance log entry and the accident tachometer time, the airplane had flown about 23 hours since the oil change. The pilot stated that the airplane could not have been flown for more than about 8 hours since the inspection. The rubber seal around the no. 6 push rod tube was found detached after it was salvaged, but it could not be determined if this was a preimpact condition. The published useable oil quantity for the engine is 5.6 qts. in a 5-degree nose down attitude. Conclusive evidence for the loss of engine oil could not be determined.
Probable Cause: Oil starvation of the engine due to undetermined reasons, which led to the failure and separation of a main bearing and a connecting rod. A factor contributing to the accident was the lack of suitable terrain for a successful forced landing.
Accident investigation:
 |
|
Sources:
NTSB SEA97LA195
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 21-Dec-2016 19:26 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 08-Apr-2024 13:14 | ASN Update Bot | Updated [Time, Operator, Other fatalities, Phase, Departure airport, Destination airport, Source, Narrative, Category, Accident report] |
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