FAA Powerplant Written Practice Test

What is the alternative name for the oil pressure bypass in an aircraft engine system?

1. Regulation valve

2. Filter bypass valve

3. Control valve

4. Pressure relief valve

The correct answer is: Filter bypass valve

The oil pressure bypass in an aircraft engine system is commonly referred to as the filter bypass valve. This valve is critical for maintaining oil flow within the engine, particularly in situations where the oil filter may become clogged or restricted. The filter bypass valve allows oil to bypass the filter, ensuring that the engine continues to receive adequate lubrication even when the filter is not functioning optimally. The presence of this valve is essential for preventing engine damage due to insufficient lubrication, as it enables a continuous oil supply directly to the engine components. Its operation is designed to activate when the differential pressure across the filter exceeds a certain threshold, indicating that the filter is dirty. In understanding the context of other options, while a regulation valve and a control valve are terms that may appear similar, they do not specifically refer to the function of bypassing oil in the event of filter clogging. The pressure relief valve, on the other hand, serves a different purpose by protecting the system from excessively high pressure rather than managing flow due to filter conditions. Thus, the appropriate terminology for the oil pressure bypass is indeed the filter bypass valve.