What was found
BNA - FLT 4048 - CREW REPORTED AFTER TAKEOFF AND AT ABOUT 11,000 FT, HEARD LOUD NOISE AND RECEIVED A NR 1 DUCT LEAK LIGHT AND CARGO SMOKE WARNING. AIRCRAFT RETURNED TO FIELD WITHOUT FURTHER INCIDENT. MAINTENANCE INSPECTED THE AIRCARFT AND FOUND A BLEED DUCT UNDER THE CARGO FLOOR HAD SEPARATED AT THE UNION. MAINTENANCE REMOVED AND REPLACED A CLAMP AT THE DUCT UNION IAW EMB-145 MM 36-11-09, OPERATIONAL AND LEAK CHECKS WERE SATISFACTORY. AIRCRAFT RELEASED FOR SERVICE. (M)