What was found
AIRCRAFT ARRIVED WITH DISCREPANCY, 'RIGHT MAIN LANDING GEAR FORWARD DOORS DO NOT CLOSE ALL THE TIME'. PERFORMED RETRACTION TESTS, FOUND UPLOCK BOOK ASSY, P/N 159LM10124-1, STRIKING PISTON/AXLE ASSY CASTING, P/N 173527, IN RETRACTED POSITION NOT COMPLETING CYCLE OF LANDING GEAR, THUS, NOT ALLOWING FORWARD DOORS TO CYCLE CLOSED. DISASSEMBLED UPLOCK ASSY, REMOVED UNAPPROVED SHIMS, INSPECTED, AND REASSEMBLED IAW MM. THE LANDING GEAR WILL NOW COMPLETE ITS CYCLE, BUT THE HOOK ASSY IS STIFF CHAFING THE CASTING ASSY ON INBD SIDE OF CASTING, CLEARANCES REMAIN INADEQUATE. SUBMITTER SUGGESTED REALIGNMENT OF THE REAR ATTACHMENT OF THE UPLOCK SUPPORT BEAM WOULD BE REQUIRED TO ELIMINATE DISCREPANCY.