What was found
STRONG SMELL OF BURNT PLASTIC IN THE FLIGHT DECK. THE SMELL WAS OVERWHELMING WHEN THE RECIRCULATION FAN WAS TURNED ON. TROUBLESHOT TO RECIRC FAN 1. STRONG SMELL OF BURNT PLASTIC IN THE FLIGHT DECK. SMELL OVERWHELMING WHEN THE RECIRCULATION FAN TURNED ON (FLIGHT 5238) TROUBLESHOT PER FIM 21-20-00. FOUND NO ABNORMAL SMELLS EXCEPT FOR WHEN RECIRC FAN 1 WAS ON. DEFERRED RECIRC FAN 1 PER MEL 21-24-1A. MX ACTIONS COMPLIED WITH. PLACARDS INSTALLED. PERFORMED FIM 21-20-00-810-801-A INTERROGATED CMC, FOR RECIRC SYS FAULTS ON STATUST ECS PAGE, LOOKED FOR FAULTS FOR RECIRC SYSTEM, MX MESSAGES RELATED TO RECIRC FAN/RELAYS, FOUND NO FAULTS.EXAMINED PAX CABIN FOR ABNORMAL SMELLS COMING FROM CEILING LIGHTS, SIDEWALL LIGHTS, READING LIGHTS, ACFT IN SEAT POWER OUTLETS, NO ELECTRICAL SMELLS FOUND, EXAMINED FWD & AFT LAVS, FOUND NO ABNORMAL SMELLS. EXAMINED FWD ENTRANCE AREAS, AFT ENTRANCE AREAS, NO ABNORMAL SMELLS FOUND EXAMINED WINDSHIELD HEATER SYSTEMS, FBW BACKUP BATTERY, COCKPIT LIGHTING NO ABNORMAL SMELLS NOTED BY MX.CHECKED FOR SMELLS DURING APU START AND STOPS AND FOUND NO ABNORMAL SMELLSCOMP WASH WAS NOT ACCOMPLISHED, EXAMINED CONNECTION OF GPU AND