What was found
ATB. AVIONICS SMOKE APPEARED ON ECAM ALSO SMOKE WAS PRESENT ON COCKPIT AND CABIN RETURNED TO SKBO OVER WEIGHT LANIND WAS PERFORMED (69700 KG APROX) // STRONG CHEMICAL OR BURN ODOR IS FELT IN THE COCKPIT MAKING SLIGHTCREW UNCONSERTABLE // CORRECTIVE ACTIONS: NOV 21. AMM71-00-00-710-003-B AUTOMATIC START WAS ACCOMPLISHED AND IN ACCORDANCE WITH AMM 21-26-43-600-016-A STEP 4A DEMISTER FILTER WAS REPLACED AND INSPECTED BLOWER ,EXTRAC FANS AND PEDESTAL INSTRUMENT AMM 71-00-00-710-003-B AUTOMATIC START WAS ACCOMPLISHED AND NOT DUPLICATED FAULT / NOV 22. THIS REPORT IS DEFERRED TO DMI WO 1882722 N724AV-CNMCC-2018-AV5348. IN ACCORDANCE WITH AMM 25-18-00-040-802-A DEACTIVATION OF THE ADDITIONAL COCPIT ELECTRICAL SUPPLY SYSTEM WAS PERFORMED. STATIC INVERTER (3NA) WAS REMOVED AND INACCORDANCE WITH TSM 05-50-00-810-831-A IDENTIFICATION OF THE CAUSE OF CABIN ODOR OR SMOKE WAS PERFORMED.