This company arose from an agreement between Snecma and General Electric to develop, manufacture and market the CFM-56 engines in several different versions.

-It is a two shaft turbofan delivering 30,000 lbf. of thrust at 0.8 Mach.

-For this engine Snecma contributed with the M-56 and GE with the GE-13 (F-101 core) and from these two engines arose the present CFM-56.

-The first test flight was made around 1974 in the USA and in 1977 with a European Caravelle.

-Since then there have been repowered many DC-8, KC-135 R and F, Airbus A-320 and Boeing 737-300, etc.

-They have built countless CFM56 versions, which finally had Airbus for its A-319, -320, -321, -340 and Boeing for their 737-300 -400 and -500 as main customers.

"CFM-56"

-The versions vary according to their application from 20,000 lbf to over 30,000 lbf.

"CFM-56 section"

-Lately this consortium presented the CFM-88, with a multi step compressor and it was totally derived from the M-88 military engine that uses the core and the rest from the CFM-56. The CFM-88 remained as a project.

-The evolution of the main CFM engines, through the "Dash -number" may be following.

-It is an important engine of flexible design that adapts to the needs of various airline aircraft.

-The family is composed of the CFM56 engines and covers powers between 18,500 and 34,000 pounds of thrust. They are from GE and Snecma. See.

-Wel known is the CFM56-2 with about 23,000 lbf (plus or minus a thousand pounds) mounted on the KC-135, E-3, E-6 or DC8 Super 70.

"CFM-56-2"

"CFM56-3"

“CFM56-5A"

"CFM56-5C"

"CFM56-5B"

-The CFM56-3 turbofans that deliver 18,500 to 23,500 lbf are fitted on the Boeings 737-300/400/500.

-The CFM56-5A with 22000 to 26500 lbf are installed on the Airbus A319 abd A-320.

-The CFM56-5C engines that deliver 31,200 to 34,000 lbf are fitted on the Airbus A340-200 and 300.

-The CFM56-5B with 22,000 to 33,000 lbf has been installed on Airbus A318, A319, A320 y A321.

-The CFM56-7B from 18,500 to 27,300 lbf. for the Boeing 737-600/700/800/900 y BBJ.

-Now the same engines are shown in longitudinal diagrams.

-CFMI, CFM International, is a recognized alliance for mainly commercial aviation engines ranging from CFM56-1 to CFM56-7 that have power outputs from 85 to about 120 kN.

"CFM56-2"

-CFM is exactly 50% GE and 50% Snecma owned.

-The CFM56-2, from 98 to 107 kN, in its different variants -A, -B, -C,  were mounted on the KC135R, FR, DC8 Super 70.

"CFM56-3"

-The CFM56-3B1 on the Boeings B737-300 and 500. These turbofans have a power output from 82 to 105 kN of thrust and like all of them, they have double body and double flow.

"CFM56-5A"

-The CFM56-5As already appear in the new Airbus A319 and A320. They have between 98 and 118 kN of thrust.

-The -5B1, B2 and B3 variants are mounted on the A321. The -5B4 on the A320s and the -5B5 , B6 y B7 on the A319s.

-From the 5Bs they would build the -7.

-And the CFM56-5C2, C3 and C4 are installed on the Airbus A340.

"CFM56-7"

-The first CFM56-7 were fitted on the B-737 600, 700 and 800 series, as well as on the B737NG.

From appendix 6: The LEAP engine (initially known as LEAP-X) is an evolution from the already veteran CFM-56.

-The Leap engine is scheduled to enter service by 2015.(Modified info in appendix 10). It offers lower consumption and less emissions in important quantification like approximately 16% and 50% respectively.

"CFM Leap section"

-From appendix 9: SAFRAN (Snecma) also gathers GE in the CFM-56 engine design. The latest product of optimized consumption and noise have been optimized LEAP.

-These engines have the same architecture as the previous CFM but with the mentioned improvements. There are three types in the family:

-1A with 24500 to 32900 lbf. of thrust.
-1B with 23000 to 28000 lbf. of thrust
-1C with 27980 to 30000 lbf. of thrust.

"LEAP"

-LEAP stands for "Leading Edge Aviation Propulsion".

-We also could see it as a technological leap forward.

From appendix 10: A CFM press release from April 14th 2016 informs that the first two LEAP 1A engines have been delivered to Airbus. The LEAP engine has been tested with two Airbus A320neos.

The LEAP-1A flew for the first time on the Airbus A320neo on May 19, 2015. A second A320neo was added to the test program in September of 2015, and in February 2016, the LEAP engine was the first to power the new A321neo. 

At the time of editing (July 2016) the company had over 10,500 orders and commitments for LEAP engines.