MONROE, WI, USA
N5818F
PIPER PA-32-300
WHILE CRUISING AT 4,000 FT MSL THE ENG QUIT. DURING A FORCED LANDING ON ROLLING FARM TERRAIN BOTH MAIN LANDING GEAR SEPARATED. THE ACFT THEN SLID THROUGH A BARBED WIRE FENCE & CAUGHT FIRE. METALLURGICAL EXAMINATION REVEALED A FATIGUE FAILURE OF THE IDLE SET SCREW THAT CONTROLS THE DIAPHRAM SETTING IN THE BENDIX FUEL INJECTION (P/N 2424273-10). THE STEMOF THE SCREW FAILED AS A RESULT OF REVERSED BENDING STRESSES CAUSED BY SIDE TO SIDE FORCES. THIS TYPE OF FAILURE COULD NOT BE EXPLAINED AS THE PRINCIPAL FORCE APPLIED TO THE ADJUSTMENT SCREW WOULD PRIMARILY BE IN A TWISTING MOTION RATHER THAN A SIDE TO SIDE APPLIED FORCE.
Source: NTSB Aviation Accident Database
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