When is differential control used for cabin pressure?

Differential control is an essential aspect of cabin pressure management, primarily focused on maintaining safety and structural integrity during flight. It is utilized to prevent the maximum differential pressure from being exceeded. The maximum differential pressure refers to the difference between the pressure inside the cabin and the atmospheric pressure outside the aircraft.

As the aircraft climbs, external pressure decreases, and it is crucial to ensure that the pressure inside the cabin does not exceed safe limits. Differential control systems automatically adjust the outflow valve to regulate the cabin pressure, ensuring that it remains within predefined safety boundaries. This helps to avoid structural damage to the aircraft, which can occur if the differential pressure becomes too great.

While maintaining cabin temperature, humidity, and managing speed are important aspects of overall cabin comfort and flight operations, they are not directly related to differential pressure control. The primary focus of differential control is to maintain the safety margin around the maximum allowable pressure difference throughout all phases of flight.