In which situations should preservatives always be used on avionic equipment?

Using preservatives on avionic equipment is particularly important prior to shipment and after exposure to elements because these situations present the highest risk for corrosion and damage. Preservatives serve as a protective barrier against moisture, contaminants, and other environmental factors that can cause corrosion during transit or while the equipment is temporarily exposed to harsh conditions.

When equipment is exposed to elements—such as rain, humidity, or extreme temperatures—without a protective layer, the likelihood of corrosion increases significantly. Additionally, equipment transported between locations may encounter varying climatic conditions that can further expose it to potential damage.

Applying preservatives in these situations ensures the longevity and reliability of avionic systems, safeguarding critical components in an environment that could otherwise be detrimental to their integrity and functionality.