What controls the operation of the cabin pressure regulator?

The cabin pressure regulator primarily functions based on cabin altitude, which is the internal pressure level maintained within the aircraft cabin. As the aircraft ascends or descends, the cabin altitude changes, and the pressure regulator adjusts the cabin pressure accordingly to ensure that it remains at a safe and comfortable level for passengers and crew. This system monitors the difference between the external atmospheric pressure and the desired cabin pressure, allowing it to efficiently manage the airflow and overall cabin pressure.

While temperature regulations, air density, and altitude settings all play a role in the overall performance and efficiency of the cabin atmosphere control system, it is the cabin altitude that directly influences the operation of the pressure regulator. This is because the cabin altitude dictates the amount of pressurization needed to maintain a stable environment, making it the fundamental control parameter for the regulator's operation.