What was found
NR 1 CTC DEVELOPED LOUD SQUEALING NOISE WITH METALLIC SMELL FROM AIR DUCTS INTO COCKPIT. REPLACED NR 1 CTC IAW DC8 MM 21-10-1, OPS CHECKED GOOD.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
NR 1 CTC DEVELOPED LOUD SQUEALING NOISE WITH METALLIC SMELL FROM AIR DUCTS INTO COCKPIT. REPLACED NR 1 CTC IAW DC8 MM 21-10-1, OPS CHECKED GOOD.