What is the role of the system during descent and landing concerning cabin pressurization?

The role of the system during descent and landing concerning cabin pressurization is crucial for ensuring passenger safety and comfort. Maintaining positive cabin pressure as the aircraft descends and prepares for landing is vital because it helps prevent physiological issues that could arise from rapid changes in air pressure. The system regulates the airflow and pressure levels to ensure they remain within safe limits.

When descending, the cabin pressure must be controlled and often decreased gradually to match the increasing ambient pressure outside. However, it is essential to keep the cabin pressure slightly higher than the outside air pressure during landing to prevent any abrupt pressure differential that could affect the structures of the aircraft or the comfort of those onboard. Thus, controlling cabin pressurization to achieve a positive landing pressure is a critical function of the system.

This management of pressure ensures that there is a smooth transition for passengers and crew as the aircraft approaches the ground, allowing for a safe landing without the complications of rapid decompression or discomfort related to pressure changes.