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An aircraft hydraulic system that has low-pressure fluid flow in the system when the system actuating mechanisms are idle is referred to as…

  • A
    a Closed Centre Hydraulic System.
  • B
    a Pressure Neutral Hydraulic System.
  • C
    an Open Centre Hydraulic System.
  • D
    a Positive Return Hydraulic System.

Refer the figure.

The description in the question refers to an Open Centre Hydraulic System, an example is in the annex. Open centre systems are usually used for systems which do not require a constant pressure to be maintained all the time like landing gears and flaps as these are powered for a short time only each flight.

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