What occurs during cruise concerning cabin pressure?

During cruise, the cabin pressure is carefully controlled to ensure passenger comfort and safety. The correct answer highlights the role of the cabin pressurization system in maintaining an isobaric schedule, which means that the pressure in the cabin is kept consistent despite changes in altitude. This is crucial because, as an aircraft ascends, the outside atmospheric pressure drops significantly; without proper management, the cabin would potentially expose passengers to uncomfortable or even harmful conditions.

By maintaining an isobaric schedule, the cabin pressure is kept at a safe level, typically higher than the outside atmospheric pressure, which helps to avoid issues such as hypoxia and discomfort from rapid pressure changes. This consistent pressure allows for a smoother flight experience and ensures that the cabin environment remains stable for those on board.

In cruise, the pressurization system does not turn off, the pressure does not fluctuate significantly, and the cabin altitude does not continuously rise; rather, the system actively manages pressures to avoid these scenarios, looking to maintain a balance conducive to human physiology.