FAA Powerplant Written Practice Test

What can be a consequence of engine parts being soaked in inappropriate cleaning solutions?

1. Part hardening

2. Surface contamination

3. Structural failure

4. Color change

The correct answer is: Surface contamination

When engine parts are soaked in inappropriate cleaning solutions, surface contamination can occur. This happens because certain cleaning agents may leave behind residues, such as chemicals or solvents, that can adhere to the surface of the components. This contamination can interfere with the normal function of the engine parts, especially in precision-engineered components where surface integrity is critical for proper operation. Surface contamination can lead to a variety of issues, including reduced lubrication properties, increased wear, and potential chemical reactions during engine operation that can degrade the material over time. It is crucial to use cleaning solutions specifically designed for aircraft engine components to avoid these adverse effects and ensure that the parts maintain their integrity and performance capabilities. Inappropriate cleaning solutions can also lead to other consequences, but surface contamination is a primary concern as it directly affects the function and safety of an engine. Other issues, while relevant, often stem from contamination as a root cause. Therefore, understanding the significance of using proper cleaning agents is vital for the maintenance of aircraft engines.