5B engine equipped with a CFM acoustic upgrade package has begun full-scale testing in preparation for flight tests later this year. The engine is scheduled for certification in early 2003, and the upgrade will be available to customers beginning later that year.
CFM56 engines are produced by CFM International (CFM), a 50/50 joint company between Snecma Moteurs (Safran Group) of France and General Electric of the United States.
Noise and emissions have become key factors in aircraft fleet planning and operations. All CFM-powered A320 family aircraft meet current FAR Stage III noise requirements with significant margin. These engines also meet the CAEP 5 recommendations, which take effect January 1, 2006, with the exception of the CFM56-5B engine for the higher-gross-weight A321. CFM and Airbus have defined an acoustic package to ensure this aircraft/engine combination will operate well within proposed limits.
The upgrade will reduce the engine's cumulative noise signature to at least 10 EPNdB (effective perceived noise in decibels) below Stage III levels. The technology being developed includes: three-dimensional aerodynamic outlet guide vanes; a core chevron nozzle; and improved reverser and inlet linings on the nacelle. Airbus will begin conducting flight tests in November 2002. The final configuration and availability of the upgrade package, as well as the new production configuration, will be determined based on the results of the flight test program.