Hydraulic fluids for aerospace applications encompass phosphate-ester-based formulations such as Skydrol and Hyjet types, mineral-oil-based fluids, and synthetic hydrocarbon variants, all qualified to specifications including MIL-PRF-5606, MIL-PRF-83282, and DEF STAN 91-101, with fluid selection governed by flammability resistance, viscosity index, material compatibility, and operating temperature range across airframe and actuation systems.
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