FAA AMT Airframe Test 2026 – 400 Free Practice Questions to Pass the Exam

The pressure regulator in a hydraulic system serves the purpose of maintaining the system operating pressure within a predetermined range and unloading the pump when necessary. This is crucial for the proper functioning of the hydraulic system as it ensures that the pressure doesn't exceed safe limits, preventing damage to system components and maintaining consistent operation. By unloading the pump when the pressure reaches the set limit, the pressure regulator helps in regulating the flow of hydraulic fluid and prevents over pressurization. This is why option A is the correct answer.

Options B, C, and D are incorrect:

- Option B is incorrect because the pressure regulator does not increase the hydraulic fluid pressure as needed but rather maintains it within a predetermined range.

- Option C is incorrect because the pressure regulator is not designed to decrease the system's operating temperature.

- Option D is incorrect because the pressure regulator's function is not to clean the hydraulic fluid but to regulate and maintain the system operating pressure.