FAA Powerplant Written Practice Test

How often should an engine be operated to maintain its active storage status?

1. Every week for at least 30 minutes

2. At least once every 30 days for no less than one hour

3. Bi-weekly for at least 45 minutes

4. Once a month for no less than 15 minutes

The correct answer is: At least once every 30 days for no less than one hour

Maintaining an engine's active storage status is crucial for preventing mechanical issues that can arise from stagnation. The requirement to operate the engine at least once every 30 days for no less than one hour ensures that all components are adequately lubricated and that any potential corrosion is minimized. This frequency helps in circulating the oil, which maintains the engine parts' health and prevents the build-up of moisture or sludge in the oil and fuel systems. Additionally, a minimum duration of one hour allows the engine to reach its normal operating temperature, ensuring proper thermal expansion of materials and enhancing the evaporation of any accumulated moisture. This operational routine helps in identifying any issues early on, as running the engine provides an opportunity to detect abnormal sounds, vibrations, or performance changes that might not be noticeable during long periods of inactivity. Other options suggest either shorter intervals or durations which may not sufficiently address the need for thorough lubrication and moisture prevention, potentially leading to engine deterioration over time. The selected guideline aligns with best practices for engine maintenance in aviation to ensure reliability and safety when the engine is called back into service.