NTSB Identification: NYC00LA061.
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Accident occurred Saturday, December 25, 1999 in FLORENCE, NJ
Probable Cause Approval Date: 08/13/2001
Aircraft: Zielke RV-4, registration: N8ZZ
Injuries: 1 Minor.
NTSB investigators may not have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.
About 30 minutes after takeoff, the pilot felt a 'buzz,' which lasted approximately 2 seconds. The airplane then shook violently, so the pilot retarded the throttle to reduce the shaking. He then turned the magnetos off, one at a time, and reapplied power, but the shaking returned with each power application. Carburetor heat was also applied, with no effect. The pilot then tried to add enough power to maintain altitude, but still found that its application resulted in violent shaking. Power was again reduced to keep the airplane controllable. The pilot attempted to guide the airplane to a nearby airport, but could not hold altitude, and headed for a plowed field. He tried to align the airplane with the furrows, but was unable to due to the approach angle. Upon touchdown, the landing gear collapsed, and the wing spars were damaged. During post-flight examination, part of one of the wooden propeller blades was found to be missing. There was no evidence of a bird strike. The propeller had been bolted onto the hub with the correct torque's, and the cowling had been found securely fastened to the airframe. The engine was also examined, with no significant anomalies noted, and there was no indication of airframe flutter.
The National Transportation Safety Board determines the probable cause(s) of this accident to be: Failure of one of the propeller blades. A factor was the necessity land across, rather than in alignment with, the furrowed terrain due to the nature of the emergency. Full narrative available
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