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

Question: 1 / 1030

Three types of hydraulic fluids currently being used in civil aircraft are?

Mineral base, synthetic base, and vegetable base

Mineral base, vegetable base, and phosphate ester base

Phosphate ester base, silicone base, and mineral base are incorrect because they are not all currently being used in civil aircraft. Each of these hydraulic fluids may have been used in the past or may even be used in a specific type of aircraft, but only mineral base, vegetable base, and phosphate ester base are currently being used in civil aircraft.

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Phosphate ester base, silicone base, and mineral base

Vegetable base, silicone base, and synthetic base

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