Where Does the “Barking” Sound We Hear On Airplanes Actually Come From?

Especially Airbus 320 This interesting event seen in type passenger planes causes the passengers to panic at times. This sound, which no other device or device makes on the plane, fortunately does not pose any danger.

“Dog barking sound” We can understand that the plane is in balance as soon as we hear it.

This sound It comes from the hydraulic system called PTU – Power Transfer Unit, that is, the power transfer unit.

This sound is usually heard with the push back tool from the aircraft park position. while being pushed back or after the engines are turned off on landing.

This sound we hear is actually an important detail for fuel economy.

When trying to provide hydraulic balance, the system is constantly as you take an on-off position We also hear this sound similar to barking.

This sound can sometimes be heard in the form of buzzing. The source of the buzzing sound is also the one responsible for the opening and closing of the cargo compartment doors. It’s the sound of a hydraulic pump.

So how does this whole system work?

There are three types of hydraulic systems in the Airbus A320. These, green blue and yellow is referred to as. The blue system works with only electrical power, while the green and yellow systems are powered by the motors.

In addition, the yellow hydraulic system, when the engine fails works with electricity. PTU’s mission starts right here. If the pump of the green hydraulic system powered by the left engine fails or the left engine stalls; The PTU can transfer pressure from the yellow hydraulics to the blue hydraulics, but also vice versa. However, it cannot replace the hydraulic fluid.

During these processes, the “barking” sound that we usually hear appears. There’s nothing to worry about, the situation is just it’s just the system!