What device can provide pressure from the green hydraulic system to the yellow hydraulic system or vice versa?

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The device that can provide pressure from one hydraulic system to another, such as from the green hydraulic system to the yellow hydraulic system or vice versa, is the Power Transfer Unit (PTU). The PTU is crucial in ensuring that hydraulic power can be shared between systems, which is particularly important for redundancy and providing operational flexibility, especially during situations when one hydraulic system might be underutilized or inoperative.

The Power Transfer Unit functions by using hydraulic pressure from one system to drive a pump that delivers fluid to the other system. This capability allows the aircraft to maintain operational functionality across both hydraulic systems, ensuring that necessary components can continue to operate even if one system experiences a drop in pressure or failure.

While other devices play significant roles in hydraulic systems—such as the Hydraulic Control Unit, which manages system pressures and flows; the Pressure Regulator, which maintains specified pressure levels; and the Flow Control Valve, which directs hydraulic fluid to various components—none of these devices have the specific function of transferring pressure between the hydraulic systems like the PTU does.

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