Serious incident Piper PA-28R-200 N4999S, Friday 30 March 1984

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Date:	Friday 30 March 1984
Time:	16:45 LT
Type:	Piper PA-28R-200
Owner/operator:	Carolina Flying Service
Registration:	N4999S
MSN:	28R-35724
Year of manufacture:	1970
Engine model:	Lycoming IO-360-C1C
Fatalities:	Fatalities: 0 / Occupants: 3
Other fatalities:	0
Aircraft damage:	Minor
Category:	Serious incident
Location:	Clayton, NC - United States of America
Phase:	En route
Nature:	Unknown
Departure airport:	Mt. Olive, NC (W40)
Destination airport:	Raleigh, NC (KRDU)
Investigating agency:	NTSB
Confidence Rating:	Accident investigation report completed and information captured

Narrative:
DURING FLT, THE PLT & A PASSENGER NOTED A LOSS OF ENG POWER ACCOMPANIED BY A METALLIC SOUND. SUBSEQUENTLY, A WHEELS-UP FORCED LANDING WAS MADE IN A PLOWED FIELD. AN ENG TEARDOWN REVEALED THAT THE CRANKSHAFT, P/N 54297-1, HAD FAILED FROM FATIGUE. A METALLURGICAL EXAM REVEALED THAT THE FATIGUE CRACK ORIGINATED AT A MACHINE GROOVE NORMALLY ASSOCIATED WITH OVERHAUL OF THE CRANKSHAFT. THE CRANKSHAFT HAD 130 FLT HRS SINCE IT HAD BEEN RECONDITIONED BY AN FAA APPROVED REPAIR STATION.

Probable Cause:

Accident investigation: