From where does the PTU obtain its pressure?

The pressure for the Power Transfer Unit (PTU) is obtained from the right side hydraulic system. The PTU is designed to automatically transfer hydraulic power from one side of the aircraft's hydraulic system to the other, ensuring that enough pressure is available to maintain control during various flight conditions.

The choice of the right side hydraulic system is due to its role in providing redundancy and reliability in hydraulic operations. If the left side hydraulic system were to experience a failure or drop in pressure, the PTU activates to utilize the reserves from the right side to compensate, thus maintaining essential functions such as control surface movement and landing gear operation.

The central hydraulic system and battery power are not directly linked to the PTU's function since the PTU specifically taps into the right side hydraulic system for its pressure requirements. Understanding this interplay within aircraft hydraulic systems is crucial for ensuring operational safety and effectiveness.