FAA Powerplant Written Practice Test

What is the main function of a last chance oil filter?

1. To enhance oil flow to the engine

2. To prevent clogging of the oil spray nozzles

3. To filter fuel before it enters the engine

4. To cool the oil before circulation

The correct answer is: To prevent clogging of the oil spray nozzles

The last chance oil filter is primarily designed to prevent any contaminants from reaching critical engine components, particularly the oil spray nozzles. Its main function is essential for protecting these nozzles, which provide lubrication to vital engine parts, ensuring they operate smoothly and reducing the risk of wear or damage. By filtering out particles that may have bypassed earlier filtration stages, this filter plays a crucial role in maintaining oil cleanliness and, consequently, overall engine health. The option regarding enhancing oil flow is inaccurately focused on the role of the filter. While proper filtration can contribute to better oil performance, the primary purpose of the last chance oil filter is not to enhance flow but to ensure cleanliness. Filtering fuel before it enters the engine relates to fuel filtration rather than oil filtration. The last chance oil filter is solely concerned with oil contamination, not fuel. Cooling the oil before circulation is a function typically associated with oil coolers rather than oil filters. The last chance oil filter does not significantly alter the temperature of the oil but rather ensures that it is free from harmful debris prior to circulation through the engine.