Hydraulic systems are the muscles of an aircraft. Landing gear, flight controls, cargo doors, thrust reversers, brakes all rely on stable hydraulic power. If those systems are not tested and verified properly on the ground, every flight is taking an unnecessary risk. This is exactly where hydraulic test rigs also called hydraulic test stands or "mules" become critical Ground Support Equipment. They allow airlines, MROs, and defense operators to simulate real aircraft hydrauli
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