What was found
INSPECTION TYPE-N/A, UPON LOWERING LANDING GEAR HANDLE ON APPROACH, A VERY LOUD VIOLENT NOISE WAS HEARD FROM WHAT SEEMED LIKE THE AREA OF THE NOSE GEAR. THE RT AND NOSE GEAR INDICATED DOWN AND LOCKED, THERE WAS NO GREEN GEAR DOWN LIGHT FOR THE LEFT GEAR. AT THE SAME TIME HYD SYS PRESS INDICATED ZERO AND THE HYD QTY WAS MOVING QUICKLY TOWARDS EMERGENCY HYD PUMPS SELECT BYPASS. ACCOMPLISHED LOSS OF ALL HYD CHECKLIST, LANDED SAFELY.