What was found
DESCENDING THROUGH 12000 FEET APU OSS AT FLIGHT IDLE , FA'S SMELLED THE DIRTY SOCK ODOR AND NOTICIED IT IN COCKPIT. IT SEEMS TO OCCUR MOSTLY WHEN POWER GOES TO IDLE . WHEN REDUCED POWER TO IDLE GOT STRONGEST BLAST OF ODOR. FINDINGS FOR OIL ODOR IN CABIN ARE AS FOLLOWS (1)-ENGINE OIL CONSUMPTION FOR LAST 7 DAYS ENG 1-2.2 QTS ENG 2-3.1 QTS (2)-ENGINE GEAR BOX DRAIN ENG 1-2.5 QTS ENG 2- 2.5 QTS (3)-ENGINE BOROSCOPE FOUND COKING ON THE NR 1 ENG AT 2.5 STAGE. AS PER POWERPLANT ENGINEERING, TECH SUPPORT AND IAE REP, RECOMMENDED FOR ENGINE WASH, PACK BURN AND THEN PACK OZONE FILTER CHANGES. THE NR 2 ENGINE FOUND WITH NO ABNORMAL FINDINGS.