FAA AMT Airframe Test 2025 – 400 Free Practice Questions to Pass the Exam

Question: 1 / 1030

What must be done before adjusting the relief valve of a main hydraulic system that includes a pressure regulator?

Increase the system pressure

Decrease the system pressure

Eliminate the action of the unloading valve

Before adjusting the relief valve, it is important to eliminate the action of the unloading valve. This is because the unloading valve is designed to release excessive pressure from the system, and adjusting the relief valve with the unloading valve still active could result in inaccurate pressure readings and potentially damage the system. Options A and B are incorrect because adjusting the relief valve requires the system pressure to be stable, and increasing or decreasing it could affect the accuracy of the adjustment. Option D is also incorrect as there may be specific valves that need to remain closed during the adjustment process.

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Open all hydraulic valves

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