What component controls the position of the outflow valve?

The component that controls the position of the outflow valve is the pressurization controller. This device is responsible for maintaining the desired cabin pressure in an aircraft by managing how much air is released from the cabin. It utilizes information from various sensors, including cabin altitude, differential pressure, and other related parameters, to determine the need for venting air to maintain the appropriate pressure levels during different phases of flight.

The pressurization controller operates the outflow valve to either open or close based on the cabin pressure requirements and the altitude of the aircraft. This ensures that the passengers and crew experience a stable and safe environment throughout the flight. By coordinating the opening and closing of the outflow valve, the pressurization controller helps regulate the cabin altitude and maintain safety standards.

Other components mentioned, such as the cabin temperature controller and air pressure regulator, serve different functions, primarily focusing on climate control and air supply management rather than directly controlling the outflow valve position. The pneumatic actuator can be involved in moving the valve physically but is operated based on commands from the pressurization controller, which is the main component directing its actions.