What was found
LEFT HYD SYS PRESS FOLLOWED BY L HYD QTY WHEN LANDING GEAR WAS EXTENDED ON FINAL. EXECUTED GO AROUND TO RUN QRH AND CAME BACK AND LANDED UNEVENTFUL. EMERGENCY DECLARED. UPON INSPECTION FOUND NLG STEARING PRESSURE SIDE FLEX LINE, IPC 32-34-51-15 ITEM 317, TO BE RUPURED AT LOWER FITTING. PER ABOVE REF. TABLE 201 CONDITION 1. REQUIRES L/H ENGINE DRIVEN HYD. PUMP AND FILTERS REPLACED. REPLACED FLEX LINE WITH FLEX HOSE P/N 24060608-360 FROM UNIVERSAL HYDRAULIC HOSE REPAIR SET. LEAK CHECKS NORMAL. AMM: 29-11-05-4-1 REMOVED AND REPLACED #1 ENGINE DRIVEN PUMP IAW AMM 29-11-05-4-1. RAN ENGINE IAW JRH ALL PARAMETERS NORMAL. OP'S AND LEAK CHECKS GOOD.