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  • Chapter 12: Hydraulic & Pneumatic Power Systems › Hydraulic Fluid

    liquid. Manufacturers of hydraulic devices usually specify the type of liquid best suited for use with their equipment in view of the working conditions, the service required, temperatures expected inside and outside the systems, pressures the liquid must withstand ... fluidity were the only qualities required, any liquid that is not too thick could be used in a hydraulic system. But a satisfactory liquid for a particular installation must possess a number of other properties. Some of the properties…

  • Chapter 10: Aircraft Systems › Pressure Instruments › Hydraulic Pressure

    developed by the hydraulic pump(s) is required for normal operation of hydraulic devices. Hydraulic pressure gauges are often located in the flight deck and at or near the hydraulic system servicing point on the airframe. Remotely located indicators used…

  • Chapter 12: Hydraulic & Pneumatic Power Systems › Types of Hydraulic Fluids

    required of desirable hydraulic liquids. Types of Hydraulic Fluids To assure proper system operation and to avoid damage to nonmetallic components of the hydraulic system, the correct fluid must be used. When adding fluid to a system, use the type ... aircraft manufacturer’s maintenance manual or on the instruction plate affixed to the reservoir or unit being serviced. The three principal categories of hydraulic fluids are: 1. Minerals. 2. Polyalphaolefins. 3. Phosphate esters. When servicing a hydraulic system, the technician…