FAA Powerplant Written Practice Test

What type of oil system is utilized in turbine engines?

1. Wet or dry pump depending on design

2. Only a dry pump system

3. Only a wet pump system

4. A closed-loop system only

The correct answer is: Wet or dry pump depending on design

In turbine engines, the oil system can vary depending on the specific design and requirements of the engine. The correct answer reflects the flexibility in oil system designs used in turbine engines. Some turbine engines indeed utilize a wet oil sump system, where oil is stored in a reservoir within the engine casing, allowing gravity to aid in oil circulation. In contrast, others employ a dry sump oil system, which uses a separate oil tank and mechanical pumps to circulate oil through the engine, providing better lubrication and engine performance, especially under high-g load conditions. The ability to utilize either system allows for optimization based on factors such as engine size, expected performance, and operational environment. This versatility is essential because turbine engines often operate in varying operational conditions and requirements that can influence oil system performance. Understanding this distinction is crucial for maintenance and operation, as it affects oil delivery, cooling, and overall engine reliability.