Get a behind-the-scenes perspective as Airbus showcases its product line of modern jetliners with an impressive formation flight, which included the A320neo, A330-200, A350-900 and A380 aircraft. | World of Aviation

This barking noise heard on Airbus A320 and A330 aircraft is caused by a hydraulic pump called the Power Transfer Unit (PTU). It operates automatically when the hydraulic pressure drops below a certain level. The barking noise is not a sign of any engine problems and is not dangerous. It can be slightly irritating for passengers, but it is a normal part of the aircraft's operation. Next time you fly on some @airbus aircraft, you'll know what that sound is! #airbus #aviation #ptu #hydraulics #air