Embodiments are directed to gearbox covers, mast caps, port plugs, and other coverings or lids that can be used to protect aircraft components against corrosion and contaminants. The protective coverings may be may be manufactured using three-dimensional printing or other additive manufacturing fabrication methods. The protective coverings are ultraviolet-light resistant, weather resistant, and impact resistant. The protective coverings may include a desiccant filter to reduce an aircraft component's exposure to water. The protective coverings may attach to the aircraft components using thumbscrews and may include an O-ring or gasket that creates an airtight and watertight seal.