What was found
DURING DESCENT THROUGH 15000€™ CREW NOTICED BURNING SMELL AND STRONG ODOR, DONNED OXYGEN MASKS, CABIN ATMOSPHERE WARM AND HUMID, TURNED RIGHT PACK OFF AND CONDITIONS ABATED IMMEDIATELY. SMELL DISSAPATED AT APPROX 5000' NO SMOKE STARTED CONDITION INSPECTION FOR FUMES IN THE COCKPIT PER AMM TASK 05-51-56-202-001. PERFORMED OPERATIONAL TEST OF THE AIR RECIRCULATION SYSTEM PER AMM 21-25-00/501. RAN PACKS, COULD NOT RECREATE ISSUE.