An exposed jet engine at a trade show. The rear of the polished metal fan case is visible on the left. The outer casing of the compressor section, covered in fuel lines and electrical wires is to the right of the fan case. The right of the image shows the back of the engine, the exhaust area of the turbine section.
Rear view of a CFM56-5
Type Turbofan
National origin France/United States
Manufacturer CFM International
First run June 1974
Major applications Airbus A320 family
Airbus A340-200/-300
Boeing 737 Classic / Next Gen
Boeing KC-135R Stratotanker
McDonnell Douglas DC-8-70
Number built 32,645 (June 2018)[1]
Unit cost US$10 million (list price)[2]
Developed from General Electric F101
Developed into CFM International LEAP
General Electric Affinity

The CFM International CFM56 (U.S. military designation F108) series is a French-American family of high-bypass turbofan aircraft engines made by CFM International (CFMI), with a thrust range of 18,500 to 34,000 lbf (82 to 150 kN). CFMI is a 50–50 joint-owned company of Safran Aircraft Engines (formerly known as Snecma) of France, and GE Aviation (GE) of the United States. Both companies are responsible for producing components and each has its own final assembly line. GE produces the high-pressure compressor, combustor, and high-pressure turbine, Safran manufactures the fan, gearbox, exhaust and the low-pressure turbine, and some components are made by Avio of Italy and Honeywell from the US. The engines are assembled by GE in Evendale, Ohio, and by Safran in Villaroche, France. The completed engines are marketed by CFMI. Despite initial export restrictions, it is the most common turbofan aircraft engine in the world, in four major variants.

The CFM56 first ran in 1974.[3] By April 1979, the joint venture had not received a single order in five years and was two weeks away from being dissolved.[4] The program was saved when Delta Air Lines, United Airlines, and Flying Tigers chose the CFM56 to re-engine their DC-8s and shortly thereafter it was chosen to re-engine the Boeing KC-135 Stratotanker fleet of the U.S. Air Force – still its biggest customer.[4] The first engines entered service in 1982.[5] Several fan blade failure incidents were experienced during the CFM56's early service, including one failure that was a cause of the Kegworth air disaster, and some engine variants experienced problems caused by flight through rain and hail. Both these issues were resolved with engine modifications.