What was found
SHIP 381 MILD HYDRAULIC SMELL IN COCKPIT AFTER LANDING. ALSO IN CABIN. CORRECTIVE ACTION: DIRTY SOCK SMELL PRESENT WHEN APU BLEED IS SELECTED. WHEN ENGINES SUPPLY BLEED SMELL GOES AWAY. INSPECTED NBR 1 AND 2 ENGINES FOR EXTERNAL LEAKS, NONE NOTED. APU INLET PLENUM SHOWS SLIGHT OIL CONTAMINATION. ALL OIL LEVELS NORMAL ON ARRIVAL . INSPECTED DUCTING FORWARD OF EACH LT AND RT PACK OZONE CONVERTERS WITH UV LIGHT, DUCTS AND CONVERTERS CLEAN. PERFORMED A330 TSM TASK 05-50-00. DECISION TABLE LEADS TO APU AS SOURCE OF CONTAMINATION. PERFORMED DECONTAMINATION OF ECS SYSTEM. DIRTY SOCK SMELL DISAPPEARED 2-3 MIN INTO DECONTAMINATION AND DID NOT RETURN USING ENGINE BLEED. REMOVED AND REPLACED ALL RECIRCULATION FILTERS PER A330 AMM 21-21. AFTER FILTER CHANGES RAN PACKS WITH GROUND AIR AND THEN BOTH ENGINES. NO SMELL NOTED. (9330624)