What was found
DURING NR 1 ENG START, ODOR OF BURNT OIL FILLED THE COCKPIT. STRONG ODOR LASTED APPROX 90 SECONDS. ON DESCENT FOR LANDING, WHEN POWER REDUCED ODOR OF DIRTY SOCK OR MOLDY CHEESE BECAME STRONG IN COCKPIT. IAW MOCC COMPLIED WITH MTSI 21-50 1351. INSPECTED APU BLEED DUCT FOR EVIDENCE OF OIL CONTAMINATION, NO EVIDENCE FOUND. IAW AMM 36-16-02 PERFORMED MD 11 ODOR AIR CONDITIONING PACK & DISTRIBUTION DUCT CLEANING TASK IAW AMM 21-53-00. R & R COALESCE BAGS AS PART OF THE ABOVE PROCEDURE IAW AMM 21-54-05. OPERATIONS CHECKED NORMAL DURING ENG RUNS.