FAA Powerplant Written Practice Test

An engine is considered to be in active storage after what condition is met?

1. At least one continuous hour of operation with oil temperature of at least 165°F within 30 days

2. Three hours of operation at varying temperatures

3. Monthly oil changes regardless of usage

4. A total storage time of less than 30 days

The correct answer is: At least one continuous hour of operation with oil temperature of at least 165°F within 30 days

An engine is considered to be in active storage after it has met the specific condition of at least one continuous hour of operation with an oil temperature of at least 165°F within the last 30 days. This temperature ensures that the engine oil has reached a sufficiently high temperature to allow for effective circulation, which helps to remove contaminants and moisture from the engine. Additionally, operating at this temperature helps to maintain the proper viscosity of the oil, which is essential for the engine's components to function effectively. Regular operation under these conditions is crucial in preventing the buildup of harmful substances that can occur when an engine sits unused for extended periods. By achieving this operational standard within the designated timeframe, the engine is considered actively maintained, which can contribute to better performance and longevity when it is eventually put back into regular service.