cold air unit

A unit in the aircraft pressurization system that provides cold air. The air is made to drive a compressor by flowing through a turbine. The turbine extracts pressure and heat energy from the flow. The air emerges from the turbine in an expanded form (i.e., at a lower temperature). Various types of cold air units in use are turbo compressor, the brake turbine, and the turbofan.

Aviation dictionary. 2014.

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