What was found
SEA - DURING DESCENT OUT OF 13,000 FEET ON FLIGHT 393, CREW REPORTED SMELLING AN OILY ODOR AND FUMES IRRITATING TO THE EYES IN THE COCKPIT, APPEARED TO BE COMING FROM THE LEFT AIR CONDITIONING PACK. FOUND THE LEFT COOLING TURBINE LEAKING OIL. REPLACED THE LEFT COOLING TURBINE, BOTH WATER SEPARATOR COALESCERS AND THE RECIRCULATION FAN FILTER. OPERATED BOTH AIR CONDITIONING PACKS WITH ENGINES AND APU FOR PNEUMATIC SUPPLY, NO ODOR OR FUMES NOTED. (M)