NTSB Identification: NYC91LA248.
The docket is stored on NTSB microfiche number 46268.
Accident occurred Saturday, September 28, 1991 in ATLANTIC CITY, NJ
Probable Cause Approval Date: 04/27/1993
Aircraft: FAIRCHILD SW3, registration: N159MC
Injuries: 3 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 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.

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

A FAILURE OF THE DOWN LOCK ROLLER BEARINGS OF THE RIGHT MAIN LANDING GEAR, AS THE RESULT OF AN IMPROPER MODIFICATION.

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