What is the typical maximum differential cabin pressure allowed in aircraft?

The typical maximum differential cabin pressure allowed in commercial aircraft is approximately 8.4 psi. This value refers to the pressure difference between the cabin and the outside atmosphere and is critical for ensuring the safety and comfort of passengers at high altitudes.

Cabin pressure must be carefully managed to prevent issues such as hypoxia, which occurs when the body does not get enough oxygen, and to ensure that the aircraft structure can withstand the pressures exerted upon it. The 8.4 psi limit balances the need for passenger comfort—by providing a breathable environment—while maintaining structural integrity during flight operations. This pressure limit also aligns with regulatory standards established for commercial aviation, ensuring that all operational parameters are met for safe flying conditions.

The values in the other options may pertain to specific aircraft designs or operational conditions, but the figure of 8.4 psi is a widely accepted standard in the aviation industry for cabin pressure differentials.