What is the function of the power transfer unit in the hydraulic system?

The function of the power transfer unit in a hydraulic system primarily involves switching hydraulic pressure between different systems as needed. This capability is crucial for managing the distribution of hydraulic power across various aircraft systems. When one system requires hydraulic pressure—such as during emergencies or when certain systems are inoperable—the power transfer unit facilitates the transfer of that pressure to ensure that essential functions can still operate effectively.

This component helps to maintain the efficiency and reliability of hydraulic systems by enabling seamless transitions between various hydraulic circuits. By allowing one system to share pressure with another, it enhances operational safety and functionality, particularly in critical situations.