ASN Wikibase Occurrence # 162879
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Narrative: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.
|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|
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: http://registry.faa.gov/aircraftinquiry/NNum_Results.aspx?NNumbertxt=8848K
| || |
|Investigating agency: ||NTSB |
|Status: ||Investigation completed|
|Download report: || Final report|
||Updated [Time, Location, Departure airport, Source, Damage, Narrative, Plane category]|
||ASN Update Bot
||Updated [Time, Damage, Category, Investigating agency]|
||ASN Update Bot
||Updated [Other fatalities, Departure airport, Destination airport, Source, Narrative]|
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