What was found
AFTER 3 HOURS AT CRUISE, NR 3 CTC BEGAN TO SURGE FROM 10,000 RPM TO 35,000 RPM, ACCOMPANIED BY A BURNING ODOR FROM THE AIR CONDITIONING SYSTEM. SHUTDOWN NR 3 CTC, COMPRESSOR NR 3 OVERHEAT LIGHT DID NOT COME ON. VERIFIED NR 3 CTC BAD, DEFERRED IAW DC-8 MEL 21-1 DI 816 348, PLACARDED.