What are the limitations regarding cabin pressurization during descent?

Maintaining the pressure differential above 0.5 psi during descent is crucial for the safety and comfort of passengers and crew on the CRJ 200. This requirement ensures that the cabin remains adequately pressurized even as the aircraft descends. An insufficient pressure differential could lead to discomfort for passengers, possible ear and sinus complications due to rapid changes in ambient pressure, or even loss of cabin pressure in extreme situations.

The need for a controlled pressure differential is grounded in the aircraft's design to adequately handle different phases of flight. While the CRJ 200 is equipped with systems to manage cabin pressure, it must adhere to specific operational limitations that ensure safety. Maintaining the pressure differential above 0.5 psi helps prevent negative physiological effects that can arise from rapid altitude changes and ensures the environmental control system functions correctly during descent.

The other choices relate to aspects that do not directly pertain to the mandatory operational limitations for cabin pressurization during descent in the CRJ 200, making the requirement to keep the pressure differential above 0.5 psi a critical aspect of flight safety management.