What was found
FLT # 1471 LGA-FLL." DESCENDING THROUGH 10000 WE HAD A STRONG METALIC ACRID ODOR THAT PERSISTED HEAVILY UNTIL 6000 THEN ABATED SLIGHTLY BUT RETURNED HEAVILY THOUGHOUT THE CABIN UNTIL LANDING ALL CREW MEMBERS IFC PILOTS SMELLED IT STILL TASTE IT UPON LANDING.;COMPLIED WITH INFO NOTICE 2017-T015 STEPS 1 & 2. IDENTIFIED ODOR COMING FROM APU. ECS DECON LVL B ACCOMPLISHED. PER AMM 21-00-0-615-803. A/C IS OK FOR SVC. CABIN AIR QUALITY CHK GOOD."