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The function of a hydraulic fuse is to…

  • A

    prevent total system loss in the event of a hydraulic leak.

  • B

    switch to the secondary system in the event of a leak in the primary brake system.

  • C

    protect against contamination.

  • D

    allow by-passing of the hydraulic pump in the event of excessive pressure.

Refer to figure.
Commercial airplanes are dependent on their hydraulic systems, and usually have 2 or 3 separate systems. In these systems measures are taken fuse or block a hydraulic line if a leak occurs. Fuses are used for this purpose as these will shut off the flow if there is a sufficient pressure drop occurs across the fuse. So the function of a fuse as asked in this question is to prevent total system loss in the event of a hydraulic leak.

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