A320 General Familiarization Practice Test 2025 – Your Complete Exam Prep

The outflow valve is the key component responsible for controlling cabin pressurization and the exhausting airflow within the A320. It regulates the cabin pressure by opening and closing to allow excess cabin air to be released when necessary, maintaining the desired pressure differential between the cabin and the outside environment.

By precisely controlling how much air exits the cabin, it ensures that the aircraft can maintain a safe and comfortable environment for passengers and crew throughout different flight phases, particularly during ascent and descent. The outflow valve works in conjunction with the pressurization system and is critical for preventing over-pressurization or under-pressurization of the cabin, which can lead to unsafe conditions.

Other options, like the relief valve, control pressure in case of an over-pressurization scenario, but they do not actively regulate cabin pressurization like the outflow valve does. The control and pressure valves typically pertain to other systems, such as fuel or hydraulic systems, rather than the primary mechanism of cabin pressurization and airflow management.