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The General Electric CFM56-2 engine is called the "granddaddy" of the CFM line of engines. The GE CFM56-2 was the first high-bypass engine and has served as the foundation for the rest of the CFM engines. Its rugged, efficient design has made the CFM-56 engine a very popular engine. The thrust of the CFM56-2 ranges from 22,000 to 24,000 lb. The CFM56-2 first flew on re-engined Boeing 707 in 1982 and was later chosen to re-engine KC-135 tankers for the USAir Force.
The CFM56-3 was designed for Boeing 737 second-generation: 300, 400 and 500 airframe. It is based upon theCFM56 -2 engine. Thrust ranges from 18,500 to 23,500 lb. and is the airframe's only engine. This very reliable turbofan engine is in service all over the world-nearly with almost 4,500 in service. This combination of engine/airframe combo began revenue service in 1984 and has become one of the best-selling ever. Upgrade kits are available for the CFM56-3, extending life and reducing maintenance.
The CFM56-5B is the engine selected for the Airbus A320 family, it is used on almost 60 percent of the A318, A319, A320 and A321 aircraft that are sold. One of the primary factors behind the CFM56-5B's broad-based market acceptance has been its simple, rugged architecture, which gives it the highest reliability, durability, and repairability in its class. In addition, CFM continually invests in technology enhancements that make the engines even better. More than 4,000 CFM56-5B engines are in service and have accumulated 50 million flight hours. According to GE all CFM56-5B engines delivered since Sept. 2007 are built in the Tech Insertion configuration. This "Tech Insertion" upgrade provides operators with a 1 percent improvement in fuel consumption over the life of the product compared to the base CFM56-5B engine, also leading to lower C02 emissions. Tech Insertion engines also feature a better combustor that emits one quarter less NOx. As a re CFM-56 3B2, CFM56-3B2, CFM56-3 B2, CFM56 3-B2, CFM56 3B-2sult, the current CFM56-5B meets the CAEP/6 standards.
The CFM56-7B is the chosen engine for the Boeing Next-Generation Single-aisle airliner: 737-600, 737-700, 737-800, 737-900. The thrust ranges from 18,500 to 27,300 lbs. Almost 7,000 CFM56-7B engines are in service as part of the most popular engine/aircraft team in commercial aviation. The -7, with its swept fan and advanced compressor is among the most modern, efficient and reliable turbofans ever. More than 180 customers fly CFM56-7B-powered 737s and, since entering service in the mid-90s, they have accumulated more than 100 Million flight hours. All CFM56-7B engines delivered beginning in mid 2007 will be compliant with future CAEP/6 environmental requirements. The CFM56-7B also powers the Boeing/GE BBJ (Boeing Business Jet) and 737 military variants including transports special mission aircraft.