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7. CFM56 High-Bypass Turbofan
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Combining great dependability with outstanding efficiency, the CFM56 marks a turning point in commercial engine development. Its high-bypass ratio design greatly lowered noise levels and fuel consumption while yet preserving remarkable thrust capacity. While the engine's sophisticated materials and manufacturing procedures set new benchmarks for longevity, its modular architecture helped maintenance and upgrades to be easier. Comprising tens of thousands of units in use, the CFM56 has evolved into among the most successful commercial aviation engines ever built.