Which pressurization system maintains a constant cabin pressure until a preset differential is achieved?

The pressurization system that maintains a constant cabin pressure until a preset differential is achieved is known as the isobaric-differential system. This system is designed to adjust the cabin pressure dynamically in response to changes in altitude while ensuring that the pressure remains stable until the specific differential pressure threshold is reached.

This mechanism is critical in aerospace environments, as it ensures passenger comfort and safety during altitude changes by avoiding rapid fluctuations in cabin pressure. Maintaining a stable cabin environment helps prevent physiological discomfort or complications that can arise from abrupt pressure changes.

In contrast, the constant cabin pressure system might not account for the slight variations in altitude, leading to different operational characteristics that do not specifically target the achievement of a preset differential. Similarly, dynamic cabin pressure and high altitude pressure options do not pertain directly to the establishment of a designated pressure differential while maintaining a stable cabin pressure.