NTSB Identification: NYC92LA163.
The docket is stored on NTSB microfiche number 47504.
Accident occurred Wednesday, August 12, 1992 in PORTSMOUTH, OH
Probable Cause Approval Date: 09/14/1993
Aircraft: PIPER J-3, registration: N87945
Injuries: 2 Uninjured.

NTSB investigators may not have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.

THE PILOT SAID, 'WE WERE AT 2500 FEET MEAN SEA LEVEL. ALL OF A SUDDEN WE STARTED EXPERIENCING A VERY VIOLENT VIBRATION....IT WAS VIBRATING SO BADLY I WAS AFRAID IT WAS GOING TO SHAKE THE ENGINE OFF THE AIRPLANE....I SHUT THE ENGINE OFF.' HE MADE A FORCED LANDING IN A FIELD WITH HIGH VEGITATION. THE FAA REPORT SAID, '...THE ENGINE VIBRATION WAS DUE TO WOOD PROPELLER DELAMINATION OVER ONE BLADE LEADING EDGE AND TIP. TRACES OF RUST WERE FOUND ON THE WOOD WHERE THE METAL INLAY WAS ATTACHED WITH STEEL SCREWS TO THE WOOD.' THE PROPELLER MANUFACTURER CONFIRMED THAT STEEL SCREWS ARE USED TO SECURE THE LEADING EDGE TO THE WOOD BLADE.

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

THE FAILURE OF THE PROPELLER LEADING EDGE AS THE RESULT OF CORROSION AND THE SUBSEQUENT FORCED LANDING ON UNSUITABLE TERRAIN.

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