Which systems are interconnected for fluid transfer during pressure loss?

The green and yellow systems of the A320 are interconnected for fluid transfer during a pressure loss event. This interconnection allows for redundancy and reliability in hydraulic operations. In the case of a failure or pressure drop in one of the systems, the other system can assist in maintaining necessary hydraulic pressure and functionality, which is essential for safe aircraft operation.

The green hydraulic system primarily operates the landing gear, brakes, and some flight control surfaces, while the yellow hydraulic system supports additional functions like the incidentally powered brakes and some flight control surfaces as well. By allowing the two systems to interact, the aircraft can preserve hydraulic function even in the event of a single system's failure. This design enhances operational safety by ensuring that critical systems remain functional under adverse conditions.

Other combinations of systems do not typically provide the same level of interconnection for fluid transfer. The blue system, for example, is primarily used for the operation of the spoiler and is not designed to transfer fluid in the way that the green and yellow systems do in response to pressure loss. Therefore, focusing specifically on the interconnectivity designed for pressure loss scenarios clarifies why the green and yellow systems are the correct answer.