What was found
AIRCRAFT WAS GROUNDED: ON DESCENT BELOW 10,000 FT, STRONG SMELL/ODOR FROM EITHER THE PACKS OR ENGINES THROUGHOUT THE LANDING. SMELL SEEMS TO BE ONLY IN THE FLIGHT DECK. ACCOMPLISHED SMOKE, ODOR, FUMES JOB CARD 26L00021001.FOUND AVIONICS DEMISTER FILTER EXTREMELY DIRTY. REMOVED AND REPLACED AVIONICS DEMISTER FILTER IAW AMM 21-26-43 P/B 0401.