Why does the PTU make noise?

It’s the PTU that makes the barking noise. It transfers hydraulic pressure from one of the systems to the other when there is a measurable pressure difference, 500 psi. between the two. The barking happens most frequently at the gate and taxi, where most aircraft will run only one engine to save fuel.

What is barking noise on plane?

These twin-engine models feature a device called the power transfer unit (PTU), which, in layman’s terms, helps to conserve fuel. It also is designed to power the hydraulic systems in the aircraft. As the PTU cycles on and off when pressure fluctuates, it generates a loud, recurrent sound like that of a dog barking.

What are the noises on an airplane?

The noises that are heard from the engines are the result of the shearing of air-masses. Simply, the high-speed air coming out of the engines is smashing into stationary air outside and it causes noise. The landing gear has similar noise emanating from them as the flaps, since they are both hydraulic powered.

What is the barking noise on an Airbus?

A: I suspect you are referring to the Airbus A320 family when the Power Transfer Unit (PTU) activates during taxi in. The PTU has been described as a “dog barking,” “a NASCAR tire lug gun” or “sawing.” The noise is the normal sound the PTU makes when it powers one of the hydraulic systems.

How does A320 PTU work?

The PTU is a reversible motor pump located between the green and yellow hydraulic systems. It enables the green system to pressurize the yellow system and vice versa. The PTU is automatically activated when the differential pressure between the green and yellow systems is greater than 500 PSI.

What is the barking noise on a plane?

PTU
These twin-engine models feature a device called the power transfer unit (PTU), which, in layman’s terms, helps to conserve fuel. It also is designed to power the hydraulic systems in the aircraft. As the PTU cycles on and off when pressure fluctuates, it generates a loud, recurrent sound like that of a dog barking.