In an aircraft’s hydraulic system, the Power Transfer Unit (PTU) is driven by…
Refer to figure.
In aviation, a Power Transfer Unit (PTU) is a device that transfers hydraulic power from one of an aircraft's hydraulic systems to another in the event that second system has failed or been turned off. It consists of two parts: a hydraulic motor and a hydraulic pump.
The hydraulic motor in one system is used to drive a hydraulic pump in the other system.
Transfer of power is mechanical => there is no fluid transfer between systems.
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