Which hydraulic system is responsible for operating the cargo doors?

The cargo doors on the A320 are operated by the yellow hydraulic system. This system is designed to handle various functions that require significant hydraulic pressure, including the operation of the cargo doors. The yellow hydraulic system is typically used for secondary flight controls, landing gear, and cargo doors, among other systems. This design ensures that these critical functions can operate effectively, even with the aircraft in different flight configurations or states.

In contrast to the yellow system, the other systems—green and blue—serve different roles within the aircraft, such as wing and tail control surfaces or landing gear retraction. The red hydraulic system does not exist in the A320 hydraulic architecture; rather, the aircraft is equipped with just three hydraulic systems. This allocation prevents confusion in operational considerations as each system is dedicated to specific functions, thereby enhancing the reliability and performance of the aircraft's hydraulic needs.