Accident Stinson 108-1 N8848K, 27 Dec 2013
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ASN Wikibase Occurrence # 162879
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Type:Silhouette image of generic S108 model; specific model in this crash may look slightly different    
Stinson 108-1
Registration: N8848K
MSN: 108-1848
Fatalities:Fatalities: 0 / Occupants: 2
Aircraft damage: Substantial
Location:Near Lockeford, CA -   United States of America
Phase: En route
Departure airport:Lodi, CA (O20)
Destination airport: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.


FAA register:

Accident investigation:
Investigating agency: NTSB
Status: Investigation completed
Download report: Final report

Revision history:

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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