What was found
ON DESCENT AFTER ADDING POWER FROM IDLE A BURNING SMELL LIKE BURNING POPCORN / RUBBER WAS NOTICED IN THE COCKPIT. AFTER LANDING GOING FROM IDLE TO REVERSE THE SMELL RETURNED AND WAS ALSO NOTICED IN FIRST CLASS BUT NOT IN THE MAIN CABIN. INSPECTED ENG INLETS FOR OIL. NO OIL FOUND. OIL CONSUMPTION WITHIN LIMITS. RAN APU PNEUMATICS AND PACKS. NO SMELLS NOTED. IFE SYSTEM ON AND NO SMELLS OR STATUS MSG. OPERATED GALLEY EQUIPMENT, NO SMELLS NOTED.