What is the primary purpose of a cap seal?

The primary purpose of a cap seal is to protect fasteners. In aerospace assembly, fasteners are critical components that secure different parts of an aircraft together. Cap seals are designed to cover these fasteners, preventing contaminants such as moisture, dirt, and debris from compromising their integrity. This protection helps maintain the fasteners' performance and longevity, ensuring the overall safety and structural integrity of the aircraft. By shielding fasteners, cap seals play a vital role in reducing the risk of corrosion and wear that could lead to failure during operation.