During assembly, what is the main purpose of applying sealant?

Applying sealant during assembly is primarily aimed at preventing corrosion. Sealants create a protective barrier that safeguards metal surfaces from exposure to moisture, chemicals, and other environmental factors that can lead to corrosion. In aerospace applications, where materials are exposed to harsh conditions, effective corrosion prevention is critical for ensuring the durability and integrity of components and systems.

While enhancing aesthetics, reducing noise, and improving airflow may have their own merits in different contexts, they are not the main objectives of sealant application in an aerospace setting. The primary focus remains on maintaining structural integrity and preventing degradation over time, which is crucial for the safety and longevity of aircraft components.