Why does the A320 bark?

The source of certain Airbus planes' characteristic barking noise is a component known as the Power Transfer Unit (PTU). This is an element of the aircraft's hydraulic systems, and it facilitates the switching of power from one system to another in the event of a failure.



The "barking" sound heard on the Airbus A320 family (A318, A319, A320, A321) is caused by the Power Transfer Unit (PTU). This mechanical device is a critical part of the aircraft's hydraulic system, specifically designed to transfer power between the green and yellow hydraulic circuits. Because these circuits are typically powered by separate engine-driven pumps, the PTU kicks in if there is a pressure differential of 500 psi or more—such as when only one engine is running during a fuel-efficient "single-engine taxi." The unit consists of a hydraulic motor connected to a pump; it "barks" because it cycles on and off rapidly to maintain the required 3,000 psi of pressure. It is a completely normal safety feature that ensures hydraulic power is available for flight controls and brakes even if an engine or pump fails, and it usually stops once both engines are running and stabilized.

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