As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON APPROACH HAD A BURNING SMELL IN COCKPIT. SMELLED LIKE VINYL OR PLASTIC HOT SMELL. POSSIBLY ASSOCIATED WITH USE OF AIRFOIL ANTI-ICE. COULD NOT DUPLICATE DISCREPANCY. PRESSURIZED AIRCRAFT USING BOTH AIR CONDITIONING PACKS, RAN APU AND BOTH ENGINES. INSPECTED FWD ELECT COMP AND AFT EQUIPMENT COMP, NO DEFECTS NOTED.