In which area on an airplane is a cap seal used?

A cap seal is used in areas on an airplane where pressurized and non-pressurized sections come into contact. Its primary function is to create a reliable barrier that prevents the leakage of pressurization. For instance, in an aircraft, there may be various compartments that are at different pressure levels, such as the pressurized cabin and the non-pressurized cargo hold. The cap seal ensures that the pressure in the cabin is maintained without escaping into the lower-pressure areas, which is vital for passenger safety and comfort.

The cap seal's design allows it to withstand the differential pressure while also accommodating any structural movements that may occur during flight, thus maintaining its integrity over time. Understanding the specific application and functionality of cap seals helps aerospace mechanics ensure that all pressurized systems remain secure and operate effectively.