What is the maximum negative differential pressure in the cabin?

The maximum negative differential pressure in the cabin for the CRJ 900 is set at -0.5 PSI. This limitation is critical for ensuring the structural integrity of the aircraft and the safety of its occupants.

Maintaining this specific pressure threshold helps prevent potential cabin depressurization issues during flight, which can arise if the cabin pressure falls below a certain level. Negative differential pressure refers to the difference between the atmospheric pressure outside the aircraft and the pressure inside the cabin. A limit of -0.5 PSI ensures that the cabin remains pressurized efficiently and that systems designed to manage cabin pressure can operate effectively without exceeding structural limits.

Understanding this limitation is essential for pilots and crew as part of their safety protocols and operational procedures, ensuring they know the environmental parameters that impact aircraft performance and passenger safety.