Aircraft cabin pressure systems are engineered to maintain stable interior environments that allow occupants to remain comfortable and physiologically protected as an aircraft transitions through varying flight phases. To sustain these controlled conditions, the systems rely on a coordinated sequence of pneumatic, mechanical, and electronic assemblies that respond to changing operating demands. In this blog, we will examine the core components that support cabin pressurization, outline notable manufacturers that supply these assemblies, and analyze failure conditions that procurement teams should consider when evaluating replacement options.