What is the maximum positive cabin pressure differential in the aircraft?

The maximum positive cabin pressure differential for the CRJ550 is indeed 8.7 psi. This value is critical because it defines the maximum difference between the pressure inside the cabin and the outside atmospheric pressure during flight. Such a differential is important for maintaining structural integrity of the aircraft while also ensuring the safety and comfort of passengers and crew.

Understanding the consequences of exceeding this pressure differential is key for safe operations. If the cabin pressure differential were to exceed the specified limit, it could lead to structural failure, resulting in potential safety hazards. The aircraft's pressurization system is designed to maintain cabin pressure within safe limits throughout the flight, and knowing the maximum allowable differential helps flight crews manage the system effectively.

Other options present values that are not accurate for this aircraft model, reinforcing the importance of familiarizing oneself with the specific aircraft systems and limitations.