What was found
DURING CRUISE FROM KIAD TO KCEU, CREW NOTED A LOUD BANG FROM THE ENG AREA. THE CREW DIVERTED TO KCLT & ATC DECLARED AN EMER, LANDING UNEVENTFUL. TECHS VISUALLY INSPECTED THE ENG FOR DEFECTS & COMPLIED WITH A BORO INSP IAW EMM 72-00-00 & FOUND IN LIMITS. INSPECTED AIR INLET SCREEN FOR DAMAGE & NONE NOTED, IAW EMM 72-20-00. INSPECTED COMPRESSOR & COMPRESSOR STATOR FOR DAMAGE IAW EMM 72-30-05 & FOUND IN LIMITS. ACCOMP ENG RUN IAW AMM 12-B-71-00-00-00A-903A-A TESTS 1, 7, 19, & 20, PERFORMANCE CHKD GOOD. NO LEAKS OR DEFECTS NOTED, NO FURTHER RECOMMENDATIONS FROM TECHNICAL SUPPORT. ACFT RELEASED FOR SERVICE. MANUFACTURER SUGGESTS THAT POTENTIALLY ICING BUILDUP ON THE INLET SCREEN CAUSED THE NOISE.