What was found
RIGHT LANDING GEAR FAILED TO EXTEND TO THE DOWN AND LOCKED POSITION. AFTER ATTEMPTS TO SECURE/ACTUATE TO SAFE DOWNLOCK POSITION FAILED, A SUCCESSFUL GEAR UP BELLY LANDING WAS MADE. PROPELLER AND BELLY SKIN DAMAGE RESULTED, NO INJURY TO FLIGHT CREW. INSPECTION REVEALED THE RT LANDING GEAR PIVOT ASSY HAD CRACKED IN THE SPLINE AREA NEXT TO THE INNER BEARING RACE RESULTING IN FAILURE OF THE RT GEAR TO ACTUATE TO THE DOWNLOCK POSITION. 981 HRS SINCE PART INSPECTED PER CESSNA SB SEB90-1.