Cooling air control valve (CAC valve) function?

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Multiple Choice

Cooling air control valve (CAC valve) function?

Explanation:
The main concept is that the cooling air control valve regulates how much ram air flows across the heat exchanger in the environmental control system. By opening more, it increases the amount of air passing over the heat exchanger, removing more heat from the conditioned/bleed air and yielding cooler cabin air. Closing it reduces cooling. This keeps cabin temperature near the desired setting, using feedback from the ECS controls and sensors. It does not vent the cabin to the atmosphere (that’s done by the outflow/vent system), nor does it regulate engine fuel or operate the cargo door.

The main concept is that the cooling air control valve regulates how much ram air flows across the heat exchanger in the environmental control system. By opening more, it increases the amount of air passing over the heat exchanger, removing more heat from the conditioned/bleed air and yielding cooler cabin air. Closing it reduces cooling. This keeps cabin temperature near the desired setting, using feedback from the ECS controls and sensors. It does not vent the cabin to the atmosphere (that’s done by the outflow/vent system), nor does it regulate engine fuel or operate the cargo door.

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