Turbine engine air used for air-conditioning and pressurization is generally called?

The term used to refer to turbine engine air that is utilized for air-conditioning and pressurization is "bleed air." This air is extracted from the engine's compressor section and is essential in various aircraft systems, including environmental control systems and cabin pressurization.

Bleed air is typically tapped from either the high or low-pressure stages of the engine, depending on the specific requirements of the aircraft systems. It provides the necessary pressure and flow to condition the cabin environment, ensuring passenger comfort, as well as maintaining safe operating conditions within the aircraft.

In contrast, the other terms listed do not accurately describe this function. Exhaust air refers to the air expended from the engine, which is not used for pressurization or conditioning. Supply air generally pertains to the air delivered to a system from an external source rather than from the engine itself. Bypass air could imply air that bypasses certain systems but does not specifically relate to the extraction of air for conditioning purposes. Thus, "bleed air" is the correct terminology for the process of utilizing air from the engine for these essential cabin functions.