Technology | AI | Prompts on Instagram: "That strange barking sound you hear before takeoff on an Airbus A320 is not what most passengers think it is. Many assume the noise comes from the tail adjusting for takeoff, but it actually comes from the Power Transfer Unit hidden in the landing gear bay. The PTU automatically balances hydraulic pressure between systems during checks, creating the famous pulsing “barking dog” sound that echoes through the cabin. The horizontal stabilizer does move befor