What was found
ON APPROACH EXTENDING MLG & FLAPS TO 20, LT HYD QTY EICAS & COMPLETE LOSS OF LT SYS HYD FLUID. MAINTAINED CONFIGURATION & COMPLETED LT HYD QTY QRH PROCEDURE PRIOR TO LANDING. EMERGENCY DECLARED AMM 12-12-01, AMM 29-11-17-4 , FOUND FLEX LINE CONNECTED TO SWIVEL FITTING OF LT MLG DOWNLOCK ACTUATOR RUPTURED. R & R RUPTURED LINE, INSPECTED LT EDP CASE DRAIN AND PRESSURE FILTERS & DPI'S WITH NO DEFECTS FOUND. INSTALLED NEW FILTERS. SERVICED LT HYD SYS TO FULL, RAN LT ENGINE & CYCLED ALL FLT CONTROLS SEVERAL TIMES. HYD QTY DROPPED TO 0.82. RESERVICED LT HYD SYS TO FULL CYCLED ALL FLT CONTROLS AGAIN SEVERAL TIMES & HYD QTY REMAINED FULL. FILTERS & FLEX LINE LEAK CHKD NORMAL. REF WRI:71-01/6799 FOR ENGINE RUN.