Accident Aeronca 7AC N83233, Thursday 9 August 1984

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Date:	Thursday 9 August 1984
Time:	10:00 LT
Type:	Aeronca 7AC
Owner/operator:	D. Twiss,l. Carter,r. Mcelroy
Registration:	N83233
MSN:	7AC-1897
Year of manufacture:	1946
Engine model:	Continental C-65-8
Fatalities:	Fatalities: 0 / Occupants: 1
Other fatalities:	0
Aircraft damage:	Substantial
Category:	Accident
Location:	Prineville, OR - United States of America
Phase:	Manoeuvring (airshow, firefighting, ag.ops.)
Nature:	Private
Departure airport:	Prineville, OR (S39)
Destination airport:
Investigating agency:	NTSB
Confidence Rating:	Accident investigation report completed and information captured

Narrative:
WHILE MANEUVERING PLT HEARD A LOUD CHATTER COMING FROM THE ENGINE ACCOMPANIED BY A LOSS OF POWER. PLT REDUCED REMAINING POWER AND INITIATED A FORCED LANDING IN A ROUGH BARLEY FIELD. POST ACCIDENT INVESTIGATION REVEALED THE CRANKSHAFT BROKE NEAR THE NUMBER TWO CRANKTHROW. FURTHER INVESTIGATION REVEALED THE JOURNAL WAS IMPROPERLY GROUND.

Probable Cause:

Accident investigation: