FAA Powerplant Written Practice Test

What must a pilot do during a pre-flight oil check on a dry sump engine?

1. Check oil temperature

2. Inspect oil hoses for leaks

3. Manually add oil to the tank

4. Turn the propeller to circulate oil

The correct answer is: Turn the propeller to circulate oil

During a pre-flight oil check on a dry sump engine, turning the propeller to circulate oil is essential. This action ensures that the oil system is functioning properly by allowing oil to flow through the engine and return to the oil tank. It helps in establishing accurate oil level readings, as oil may settle in various compartments. By circulating the oil, the pilot can confirm that it is properly distributed throughout the engine, which is crucial for effective lubrication and overall engine performance. It's important to note that checking oil temperature, inspecting oil hoses for leaks, and manually adding oil to the tank can be parts of routine maintenance but do not specifically address the need for oil circulation during the pre-flight procedure in a dry sump system. The dry sump design generally separates the oil tank from the engine, making oil circulation a critical step for confirming that all components are adequately lubricated before flight.