ASN Wikibase Occurrence # 233317
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| Date: | Thursday 27 February 2020 |
| Time: | 15:00 LT |
| Type: |  Cessna 170A |
| Owner/operator: | |
| Registration: | N5478C |
| MSN: | 19512 |
| Year of manufacture: | 1950 |
| Engine model: | Continental O-300 |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Baker City, Baker County, OR -
 United States of America
|
| Phase: | |
| Nature: | Private |
| Departure airport: | Baker Airport, OR (BKE/KBKE) |
| Baker Airport, OR (BKE/KBKE) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The pilot reported that during a local flight, the engine started to knock and vibrate, and the oil pressure indication was low. He initiated a precautionary landing to an open field, and during the landing rollout, the airplane impacted a small ditch, which resulted in substantial damage to the left wing.
A postaccident examination of the engine revealed that the No. 2 connecting rod was separated from the crankshaft. The No. 2 connecting rod journal exhibited thermal distress and mechanical damage. The remaining connecting rod journals and the crankshaft main bearings also exhibited thermal discoloration consistent with oil starvation. When the engine was rotated, no oil flow was observed through the crank journals and lifters. The oil filter screen was covered in dark thick oil and metallic debris and was collapsed.
It is likely that the contaminated oil filter screen collapsed under pressure from the oil pump, which prevented the normal flow of oil through the engine; this resulted in the oil starvation of the No. 2 connecting rod bearing and subsequent separation of the connecting rod from the crankshaft.
Probable Cause: The failure of the No. 2 connecting rod bearing as a result of oil starvation due to a contaminated oil filter screen.
Accident investigation:
 |
|
Sources:
NTSB WPR20LA097
FAA register: https://registry.faa.gov/aircraftinquiry/NNum_Results.aspx?NNumbertxt=5478C
History of this aircraft
Other occurrences involving this aircraft
| 15 August 1983 | N5478C | Private | 0 | Ramona, CA | |
sub |
Location
Media:
Plane loses engine, lands in field next to highway in Baker County https://t.co/QNMy9XnC49
— nde (@5472_nde) February 28, 2020
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 28-Feb-2020 16:18 | Geno | Added |
| 28-Feb-2020 18:04 | RobertMB | Updated [Time, Cn, Nature, Source, Narrative] |
| 29-Feb-2020 22:36 | Iceman 29 | Updated [Embed code] |
| 22-May-2021 14:49 | Anon. | Updated [Embed code] |
| 20-Jun-2021 05:52 | aaronwk | Updated [Time, Phase, Departure airport, Destination airport, Source, Narrative] |
| 24-Jun-2022 17:57 | ASN Update Bot | Updated [Time, Operator, Other fatalities, Source, Narrative, Category, Accident report] |
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