Which statement about hydraulic fluids is accurate?

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Multiple Choice

Which statement about hydraulic fluids is accurate?

Explanation:
Hydraulic fluids are used broadly to power aircraft systems, from flight controls to landing gear and brakes. In practice, two fluid families dominate the field: mineral-oil based fluids and phosphate-ester based fluids. Because these two types account for the vast majority of hydraulic installations on aircraft, the statement that hydraulic fluids are the two most common hydraulic fluids is accurate. They are not rarely used, obsolete, or prohibited in aviation, which are reflected in the other options.

Hydraulic fluids are used broadly to power aircraft systems, from flight controls to landing gear and brakes. In practice, two fluid families dominate the field: mineral-oil based fluids and phosphate-ester based fluids. Because these two types account for the vast majority of hydraulic installations on aircraft, the statement that hydraulic fluids are the two most common hydraulic fluids is accurate. They are not rarely used, obsolete, or prohibited in aviation, which are reflected in the other options.

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