What is the primary purpose of a fillet seal in aerospace applications?

The primary purpose of a fillet seal in aerospace applications is to form a waterproof barrier. This type of seal is critical in preventing the ingress of water and other contaminants into assemblies, which could compromise the integrity of the components and the overall system. By creating a continuous and smooth seal at the junction between two surfaces, a fillet seal effectively minimizes gaps and openings where liquids might otherwise penetrate.

In aerospace applications, maintaining a waterproof barrier is essential for ensuring the durability and reliability of structures that may be exposed to harsh environmental conditions, such as rain, snow, and high humidity. The ability to protect sensitive areas from moisture contributes significantly to the longevity and performance of aircraft and spacecraft components.