What was found
INBOUND, THE YELLOW HYD SYS WAS LOST AT 9000 FEET. THE CAPTAIN DECLARED AN EMER & LANDED ON RUNWAY 36C. THE ACFT WAS TOWED TO THE GATE AS THE LOSS OF THE YELLOW SYS RESULTS IN THE LOSS OF NOSE WHEEL STEERING. FOUND A DAMAGED PACKING FOR THE UNION ATTACHING THE TEE FITTING TO THE TOP OF THE MAIN HYD PRESS MANIFOLD IN THE WW AREA. THE DAMAGED PACKING WAS REPLACED & A SATISFACTORY LEAK & OPERATIONAL CHECK WAS ACCOMPLISHED IAW AMM 29-13-14-400.