What is the function of the AC power receptacle on the A320?

The function of the AC power receptacle on the A320 is primarily to support the aircraft's ground power requirements. When an aircraft is on the ground, the AC power receptacle allows for the connection of external power sources, which can provide electricity for various systems on the aircraft, including avionics and cabin systems, while the engines are not running. This enables ground crew, including those managing pushback procedures, to utilize electrical power for communication equipment.

Using external power helps preserve the aircraft's battery life and ensures that necessary systems are operational without needing to start the engines. While communication during pushback is vital, the AC power receptacle's role extends beyond just supporting communication—it facilitates the overall operation of electrical systems when on the ground. The other options mistakenly interpret the primary purpose of the AC power receptacle, highlighting its importance in the context of ground operations and systems management.