Certified Flight Instructor - Flight Instructor Airplane Practice Exam

What measure can be taken to prevent spark plug fouling?

1. Using a richer fuel mixture

2. Regularly performing maintenance checks

3. Operating at higher RPMs

4. Reducing engine temperature

The correct answer is: Regularly performing maintenance checks

Preventing spark plug fouling is critical for maintaining engine performance and reliability. Regularly performing maintenance checks is essential because it ensures that the engine components, including the spark plugs, are functioning properly and are in good condition. Routine checks allow for the identification and addressing of potential issues before they lead to fouling, such as oil leaks, improper mixture settings, or carbon buildup on the spark plugs. Regular maintenance can include cleaning or replacing spark plugs when necessary, checking the ignition system, and ensuring that the fuel system is functioning correctly. This proactive approach minimizes the chances of spark plug fouling by ensuring that the engine operates efficiently and within its designed parameters. While operating at higher RPMs may temporarily help burn off any accumulated deposits on the plugs, it is not a long-term solution and might lead to other issues if not managed correctly. Similarly, using a richer fuel mixture or reducing engine temperature can contribute to fouling rather than prevent it. Therefore, regular maintenance checks stand out as the most effective and comprehensive measure to prevent spark plug fouling.