What was found
CLIMBING THROUGH 16,000 FT OUT OF BOS, EN ROUTE TO DCA, THE NR 1 ENGINE EXPERIENCED A LOUD BANG. THE AIRCRAFT STARTED TRACKING TO THE LT. CREW DETERMINED NO THRUST WAS BEING PRODUCED FROM THE NR 1 ENGINE, SO THEY FOLLOWED CHECKLIST AND SHUTDOWN THE NR 1 ENGINE. AN EMERGENCY WAS DECLARED AND THE FLIGHT DIVERTED TO PVD WHERE IT LANDED WITHOUT INCIDENT. MAINTENANCE DETERMINED THE NR 1 ENGINE SUSTAINED A HOT SECTION FAILURE AS METAL WAS FOUND IN THE TAILPIPE. REMOVED AND REPLACED THE NR 1 ENGINE ASSEMBLY PER JOB CARD J371-00-01. OPS CHECK AND LEAK CHECK GOOD. (M)