What is the maximum cabin-atmosphere differential that the aircraft pressurization system will maintain?

The correct answer indicates that the maximum cabin-atmosphere differential that the aircraft pressurization system will maintain is 6.6 PSI. This value is significant as it reflects the design specifications and operational limits of the aircraft’s pressurization system, ensuring safety and comfort for passengers and crew during flight.

Maintaining a specific differential pressure is critical for preventing issues related to hypoxia at high altitudes, which can occur if the pressure differential is insufficient. The aircraft's systems are engineered to generate and maintain this pressure differential, which in turn supports the cabin environment by keeping it distinct from the external atmospheric conditions encountered during flight.

This specific value of 6.6 PSI represents a balance between structural integrity of the aircraft and operational performance, enabling the system to function effectively throughout various phases of flight.