What was found
DIRTY SOCK SMELL - BEGAN ON TAKEOFF ROLL, LASTED ABOUT 5 MINUTES THEN DISSIPATED UNTIL FINAL APPROACH AND TAXI-IN. WHEN THE DIRTY SOCK ODOR WAS NOTICEABLE AGAIN. COMPLETED A220 WORK CARD 0550-2001 PER A220 NO GO ODI PREVENTION PROGRAM ATA 2172 - SMOKE/FUMES IN CABIN. RAN APU AND ENGINES, NO FINDINGS. REMOVED AND REPLACED BOTH RECIRC FILTERS PER A200 AMP 21-22. MCC NOTIFIED. BOTH FILTERS EXTREMELY DIRTY. (LP# 4371217, 4371220)