FAA Powerplant Written Practice Test

What issue may arise for engines that are not flown regularly?

1. They may lose power

2. They may overheat

3. They may not achieve normal service life due to corrosion

4. They may require more maintenance

The correct answer is: They may not achieve normal service life due to corrosion

Engines that are not flown regularly can significantly suffer from corrosion, which is the primary issue that can arise. When an engine is not in regular use, moisture can accumulate within the engine components, leading to rust and corrosion, particularly in areas like the cylinder walls, bearings, and internal surfaces. This deterioration can adversely affect the engine's performance and reliability, ultimately leading to a reduction in its service life. Corrosion can also create additional wear and tear, leading to more severe damage that may not be easily observable until it is too late. Metal components that have corroded can become weakened, leading to potential failures during operation if the engine is brought back into service without appropriate inspection and maintenance. While power loss, overheating, and increased maintenance requirements could also potentially be concerns for infrequently used engines, corrosion stands out as the most critical factor that directly impacts the overall longevity and safe operation of the engine. Regular operation helps to keep engine internals lubricated and free from moisture, which is essential for preventing corrosion and extending service life.