FAA Powerplant Written Practice Test

Which cleaning method is preferred for turbine engine components that are exposed to extreme temperatures?

1. Chlorinated solvents

2. Water-based solutions

3. Household detergents

4. Alcohol-based cleaners

The correct answer is: Chlorinated solvents

The preferred cleaning method for turbine engine components exposed to extreme temperatures is chlorinated solvents. These solvents are effective in removing oils, carbon deposits, and other contaminants without leaving residues that could potentially affect engine performance. Their strong solvent properties allow them to effectively dissolve a wide range of contaminants typically found on engine components, especially those that operate at high temperatures. Chlorinated solvents also have a high evaporation rate, which minimizes the risk of moisture-related issues after cleaning, a critical factor given that moisture can lead to corrosion or negatively impact the engine's functionality. Additionally, these solvents can withstand the high thermal environments of turbine engines without breaking down or losing effectiveness, making them particularly suitable for cleaning sensitive engine parts that endure extreme operating conditions. In contrast, water-based solutions may not be effective for oily or chemically resistant contaminants, household detergents can leave residues that could harm engine components, and alcohol-based cleaners, while useful for some applications, may not be as effective for the heavy deposits commonly found on turbine engines.