What was found
ON FIRST APPROACH TO LAND, RED TRIANGLE ON FWD NOSE WHEEL ECAM APPREARED. WE WENT AROUND ON SECOND APPROACH, GEAR DOOR WHRE NOT DOWN AND LOCKED AND WE DID FEEL AS WELL LOCKED AND WE DID FEEL AS WELLS ON THIRD APPROACH GEAR WAS DOWN AND-FOUND MISSING SCREW ON TARGET 19GA. INSTALLED NEW SCREW AND ADJUSTED TARGET 19GA TO ALLOWABLE TARGET CLEARENCE IAW AMM 32-31-73 AND TSM 32-31-00-810-896-A .BITE TEST OF LGCIU 1 AND 2 OK. A/C OK TO RETURN TO SVC.