What was found
(CAN) DURING ILS APPROACH, CAPT CALLED FOR LANDING GEAR TO BE LOWERED 'NR 2 HYD PRESSCAUTION LIGHT CAME ON FOLLOWED BY LANDING GEAR UNSAFE LIGHTS. APPROACH DISCONTI NUED, A/C ORBITED UNDER RADAR CONTROL TO EAST OF AIRFIELD. EMERGENCY CHECK LISTCONSULTED. NR 2 HYD. FAILURE DRILL CARRIED OUT AND LANDING GEAR LOWERED USINGSTANDBY SYSTEM. PAN PAN DECLARED. NR 2 HYD QUANTITY FELL TO ZERO (EXPECTED). PASS ENGERS KEPT INFORMED THROUGH OUT EVENT. A/C LANDED WITHOUT FURTHER INCIDENT. INVESTIGATION FOUND THAT THE CAUSE WAS THE NLG DRAG STRUT ACTUATOR FLEXI PIPE FRACTURING P/NO DSC252B4-0124 AND THE PTU PRESSURE PIPE P/N 829400010-159 AND SUBSEQUENTLY FAILING, POSSIBLY DUE TO LOAD AND THE INFREQUENT USE OF THE PX PIPE.