Aircraft Landing Gear Systems Practice Test

Skydrol is a common example of which type of hydraulic fluid?

Phosphate-ester-base synthetic Mineral-base Water-based Silicone-based

Correct Answer:

Phosphate-ester-base synthetic

Explanation:

Skydrol is a phosphate-ester-based synthetic hydraulic fluid. This type is chosen for aviation because it provides high fire resistance, a high flash point, and excellent stability across a wide temperature range, which is crucial in aircraft hydraulic systems where leaks near hot components could ignite if flammable fluids were used. Its synthetic phosphate-ester composition also offers good dielectric properties, helping to isolate electrical components in the system. Mineral-base, water-based, and silicone-based fluids do not offer the same combination of fire resistance and high-temperature stability needed for aircraft applications, making the phosphate-ester synthetic category the correct match for Skydrol.

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