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ASN Wikibase Occurrence # 170689
Last updated: 4 October 2020
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Type:Silhouette image of generic SONX model; specific model in this crash may look slightly different
Sonex Aircraft Sonex
Registration: N244HB
C/n / msn: 24
Fatalities:Fatalities: 1 / Occupants: 2
Aircraft damage: Substantial
Location:Macoupin County, SE of Plainview, Hillyard, IL -   United States of America
Phase: Landing
Departure airport:Taylorville, IL
Destination airport:St. Charles, MO
Investigating agency: NTSB
The private pilot and a sport pilot-rated passenger were conducting a personal cross-country flight in the experimental amateur-built airplane, which was powered by an uncertified automotive engine. The airplane was in cruise flight when it experienced a total loss of engine power. The pilot(s) attempted a forced landing on a field, during which the airplane nosed over. The wreckage path through the field was about 200 ft long, which was consistent with excessive energy/speed upon touchdown.
A review of maintenance logbook entries revealed that the engine had been assembled by the owner and that the camshaft and crankshaft had been removed when work was performed on the engine about 3 years before the accident. Postaccident examination of the engine indicated that the crankshaft had fractured due to a fatigue crack that had initiated at a fillet radius at the forward end of the No. 2 main bearing journal where the journal transitioned to the forward cheek. The cause of the fatigue crack could not be determined.
Probable Cause: The loss of engine power during cruise flight due to a fatigue fracture of the crankshaft, which resulted in a forced landing on unsuitable terrain.



Revision history:

27-Oct-2014 07:26 gerard57 Added
27-Oct-2014 22:57 Geno Updated [Time, Aircraft type, Registration, Cn, Location, Phase, Departure airport, Destination airport, Source, Narrative]
27-Oct-2014 23:03 Geno Updated [Source, Narrative]
21-Dec-2016 19:28 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]
30-Nov-2017 19:29 ASN Update Bot Updated [Other fatalities, Departure airport, Destination airport, Source, Narrative]

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