What was found
ON SHORT FINAL WHEN THE ENGINE THRUST WENT FROM IDLE TO APPROACH THRUST, VERY STRONG FUMES IN THE COCKPIT CROSS BLEED WAS SHUT WITH PACK 1 AND BLEED ONE SELECTED OFF SOLVED THE PROBLEM AND ODOR DIMINISHED. FUMES SMELLED LIKE MUSTY DRY. ISOLATED SMELL COMING FROM PACK NR 1 IAW TSM 05-50-00. PACK 1 FUME EVENT ( PACKS WITH MOD 31283/MP P7125 (FWC H2-F1 STND) AND WITH MOD 30626/MP K6443 (ENHANCED ECS) - FAULT CAUTIONS ASSOCIATED WITH OPERATIVE SIDE NOT DISPLAYED )