Which component controls cabin pressure?

The component that primarily controls cabin pressure is the pressurization system and outflow valve. The pressurization system is responsible for maintaining a comfortable and safe cabin environment at cruising altitudes, where atmospheric pressure is significantly lower than at sea level.

The outflow valve plays a crucial role within this system by regulating the amount of air that is allowed to escape from the cabin, thereby controlling the internal pressure levels. When the aircraft climbs to altitude, the pressurization system works to pump fresh air into the cabin while the outflow valve adjusts to maintain the desired pressure. If the cabin pressure needs to decrease, the outflow valve opens, allowing excess air to exit, and conversely, it closes to retain air when pressure needs to build up.

Other options, while related to cabin comfort or safety, do not directly control cabin pressure in the same way:

• The air conditioning unit manages temperature and airflow but does not regulate pressure.

• The cabin pressure sensor monitors the pressure but does not have the capability to control it.

• The emergency oxygen system is designed for supplemental oxygen supply in case of cabin depressurization rather than controlling the cabin pressure itself.

Thus, the pressurization system and outflow valve are integral to maintaining the appropriate