Hydraulic Fluids


Hydraulic fluids are specially formulated liquids that are used to transmit power in hydraulic systems. In aviation, hydraulic fluids are used to operate various aircraft systems such as landing gear, brakes, flaps, and steering. They are designed to withstand high pressure, high temperature, and extreme conditions. Hydraulic fluids must have good lubricating properties, high thermal stability, low compressibility, and resistance to corrosion and wear. They also need to be compatible with the materials used in the hydraulic system. The most commonly used hydraulic fluids in aviation are mineral oil-based fluids, synthetic fluids, and phosphate ester-based fluids.


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