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Which of these statements about an aeroplane`s hydraulic system is correct?

  • A

    The hydraulic reservoir contains a membrane and is pressurised by nitrogen on one side of this membrane.

  • B

    The pumps are always electrically driven because they need to deliver a high pressure of 3000 psi.

  • C

    A hydraulic leak in a return line does not affect the functioning of the hydraulic system.

  • D

    The filters, the pressure relief valve(s), the by-pass valve(s), and the fire shut-off valve are safety features installed in the system.

The security of the hydraulic system comprises:

  • A Hydraulic filter is installed in the pressure and return line to help removing foreign particles from the fluid and clean the oil on a continuous basis.
  • A Pressure Relief Valve (PRV) is a form of safety valve used to manage and restrict build up in a pressurised hydraulic system. In simple words, It limits the system pressure to a specific set level and if this set level is reached, the pressure relief valve responds and feeds the excess flow from the system back to the tank.
  • A Pressure bypass valve is essentially a back pressure regulator. They both control their inlet or upstream pressure and function by opening just enough to relieve excess pressure on their inlet port.
  • A Hydraulic shut-off Valve is usually installed at the engine firewall. In the event of an engine fire, the shut-off valve is closed to prevent possible ignition of the hydraulic fluid.

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