When should preservatives be used in a corrosion protection system?

Using preservatives whenever the protection system has failed is crucial for maintaining the integrity of the equipment and preventing further corrosion. When a protection system fails, it exposes the underlying material to harsher environmental conditions that can accelerate corrosion processes. Applying preservatives at this stage can re-establish a barrier against moisture, chemicals, and other corrosive agents, which is essential to safeguard the longevity and functionality of avionics equipment.

The need for timely intervention after a protection system failure ensures that any potential corrosion damage is minimized and that equipment performance is upheld. This practice is a fundamental aspect of corrosion control, aligning with industry standards aimed at extending the service life of avionics components.

In contrast, the other options suggest actions that may not be as effective for addressing corrosion risks specifically related to failures in the protection system itself. Regular inspections or applying preservatives before operations or after installation may not adequately address the immediate needs that arise from a system failure.