Air Cycle Machines (ACMs) are turbomachinery units central to aircraft Environmental Control Systems (ECS), comprising a turbine, compressor, and fan on a common shaft to expand bleed air and provide conditioned, cooled airflow for cabin pressurisation. The category covers bootstrap and three-wheel ACM configurations, associated bearings, seals, and the high-speed rotating assemblies manufactured to tight aerodynamic and dimensional tolerances.
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