FAA Powerplant Written Practice Test

Which of the following practices enhances the preservation of an engine during storage?

1. Using non-corrosive materials for packing

2. Regularly inspecting the engine

3. Replacing oil with a corrosion preventative mixture

4. Covering the engine with a tarp

The correct answer is: Replacing oil with a corrosion preventative mixture

Replacing oil with a corrosion preventative mixture is an essential practice for preserving an engine during storage. Engines are susceptible to moisture accumulation and contaminants that can lead to corrosion, particularly when they are not in use. By replacing the regular oil with a corrosion preventative oil mixture, the internal surfaces of the engine are better protected against oxidation and rust, which could occur during extended periods of inactivity. This specialized oil often contains additives designed to provide a protective barrier, significantly reducing the risk of corrosion and extending the lifespan of the engine when it is eventually put back into service. Other practices, while beneficial in various contexts, do not specifically target the prevention of corrosion as effectively as using a corrosion preventative oil. For instance, using non-corrosive materials for packing is important for physical protection during transport but does not address the internal environmental conditions of the engine. Regularly inspecting the engine is crucial for maintenance but does not actively preserve the engine during storage. Covering the engine with a tarp may provide some level of protection from external elements but does not mitigate internal corrosion risks associated with stagnant oil exposure.