CHILTON, TX, USA
N4866
GRUMMAN G-164A
DURING THE 1ST SWATH RUN THE PROP SEPARATED FROM THE ENG. A FORCED LANDING WAS MADE IN A PLOWED FIELD SHEARING ONE MAIN LANDING GEAR. THE ACFT THEN WENT THROUGH A BARBED WIRE FENCE. THE #4 CYLINDER WAS REMOVED TO INSPECT THE VIBRATION DAMPER PINS IN ACCORDANCE WITH AD 82-23-04. THE TRAILING PIN ON THE REAR VIBRATION DAMPER EVIDENCED CONSIDERABLE WEAR. THE WEAR HAD PROGRESSED TO THE POINT THAT THE DAMPER HAD BEEN DISPLACED FROM ITS NORMAL POSITION TO A POINT CAUSING INTERFERENCE WITH THE SKIRTS OF THE #2 & #3 PISTONS. THIS WEAR, IN ADDITION WITH MINOR WEAR TO THE LEADING PIN, CAUSED VIBRATION & SUBSEQUENT PROP SEPARATION. TWO DAYS AFTER THE ACCIDENT, AD 83-15-06 WAS ISSUED GROUNDING ALL ACFT WITH THE PROP-ENG COMBINATION THAT WAS INSTALLED ON THIS ACFT.
Source: NTSB Aviation Accident Database
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