ASN Wikibase Occurrence # 162879
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| Date: | Friday 27 December 2013 |
| Time: | 10:55 |
| Type: |  Stinson 108-1 |
| Owner/operator: | Private |
| Registration: | N8848K |
| MSN: | 108-1848 |
| Year of manufacture: | 1947 |
| Total airframe hrs: | 2280 hours |
| Engine model: | Franklin 6A4-150-B3 |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Near Lockeford, CA -
 United States of America
|
| Phase: | En route |
| Nature: | Private |
| Departure airport: | Lodi, CA (O20) |
| Modesto, CA (MOD) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The pilot reported that, shortly after takeoff, the engine began to sputter and that it eventually lost all power. The pilot was unable to return to the airport and initiated a forced landing to an open field. During the landing, the airplane struck a berm, nosed over, and then came to rest inverted.
A postaccident examination of the engine revealed that the crankshaft and camshaft had broken adjacent to the accessory section. A metallurgical examination of the crankshaft fracture surfaces revealed a thumbnail-shaped pattern consistent with fatigue that had initiated at the crankshaft surface near the edge of the No. 2 connecting rod journal. It is possible that the fatigue initiated due to the No. 2 connecting rod bearing shifting during operation. The camshaft fracture features were consistent with overstress. Maintenance records indicated that the last annual inspection was completed about 9 months before the accident and that, at that time, the engine had accumulated about 250 hours since major overhaul.
Probable Cause: The fatigue failure of the crankshaft, which resulted in a total loss of engine power and subsequent forced landing.
Accident investigation:
 |
|
Sources:
NTSB
FAA register: http://registry.faa.gov/aircraftinquiry/NNum_Results.aspx?NNumbertxt=8848K
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 27-Dec-2013 22:59 | Geno | Added |
| 09-Jan-2014 23:17 | Geno | Updated [Time, Location, Departure airport, Source, Damage, Narrative, Plane category] |
| 21-Dec-2016 19:28 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 29-Nov-2017 09:28 | ASN Update Bot | Updated [Other fatalities, Departure airport, Destination airport, Source, Narrative] |
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