ATLANTIC CITY, NJ, USA
N159MC
FAIRCHILD SW3
THE AIRPLANE TOUCHED DOWN ON RUNWAY 31. UPON TOUCHDOWN, THE RIGHT MAIN LANDING GEAR COLLAPSED AND THE AIRPLANE VEERED OFF THE RIGHT SIDE OF THE RUNWAY. THE AIRPLANE HAD RECENTLY UNDERGONE A MODIFICATION TO INCREASE ITS GROSS OPERATING WEIGHT FROM 14,500 TO 16,000 POUNDS. IT WAS FOUND THAT BOTH ACTUATOR POSITIONING CAMS HAD BEEN GROUND DOWN AT THE DOWN LOCK LOBES. REMOVAL OF MATERIAL FROM THE CAMS IS NOT AUTHORIZED ON THIS AIRPLANE. BOTH RIGHT MAIN LANDING GEAR DOWN LOCK ROLLER BEARING OUTER RACES HAD FAILED. THE FAA FOUND ONE BEARING IN PIECES ON THE RUNWAY, AND THE OTHER WAS NOT RECOVERED.
A FAILURE OF THE DOWN LOCK ROLLER BEARINGS OF THE RIGHT MAIN LANDING GEAR, AS THE RESULT OF AN IMPROPER MODIFICATION.
Source: NTSB Aviation Accident Database
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