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Research into the next generation of commercial jet engines, high-bypass ratio turbofans in the "10-ton" (20,000 lbf; 89 kN) thrust class, began in the late 1960s. Snecma (now Safran), who had mostly built military engines previously, was the first company to seek entrance into the market by searching for a partner with commercial experience to design and build an engine in this class.
Named CFM International, this company under French law, with capital of 400,000 francs, created in equal shares by Snecma and General Electric, was responsible for managing the program and marketing the engines. CFM's first CEO, Jean Sollier, chaired a ten-member board of directors, five from GE and five from Snecma, including two vice ...
The engine performance deteriorates with use as parts wear, meaning the engine has to use more fuel to get the required thrust. A new engine starts with a reserve of performance which is gradually eroded. The reserve is known as its temperature margin and is seen by a pilot as the EGT margin. For a new CFM International CFM56-3 the margin is 53 ...
Its joint venture with France's Safran, CFM International, produces the CFM56 (used on the legacy Airbus A320 family and the Boeing 737), and the LEAP engine (used on the Boeing 737 MAX and the ...
For jet engines, air flight speed is an important factor too. Air flight speed counteracts the jet's exhaust speed. ... CFM CFM56-2B1: turbofan: C-135, RC-135: 0.36 ...
In terms of volume, the most impactful commercial aero engine produced by Safran Aircraft Engines is the CFM International CFM56 turbofan powerplant. This engine is both developed and manufactured via a 50-50 joint venture company, CFM International, which Safran jointly owns with the American industrial conglomerate General Electric (GE).
As an example the CFM International CFM56-5A engine active clearance control uses HPC air for the HPTACC and fan bypass air for the LPTACC.Clearance control is managed by the engine FADEC which consists of an electronic control unit (ECU), an hydromechanical unit (HMU) and HP and LP ACC valves.
Refitted with CFM56 turbofans, the Super 70s were certified in 1982. The DC-8-71, DC-8-72, and DC-8-73 were straightforward conversions of the -61, -62 and -63 primarily involving the replacement of the JT3D engines with the more fuel-efficient CFM International CFM56-2, a high bypass turbofan, which