Which additional piece of aerospace ground equipment (AGE) is required during the operation of the polyalphaolefin (PAO)/air cooling cart?

The polyalphaolefin (PAO)/air cooling cart is designed as a self-contained system specifically for cooling purposes. Its operation does not necessitate additional external equipment, which simplifies its use in various aerospace applications. This self-contained nature means that it can efficiently provide cooling by utilizing its built-in components without relying on secondary generators, external power supplies, or backup cooling units. Since all necessary functionalities are integrated within the system, no additional aerospace ground equipment (AGE) is required to operate it effectively.

The other options imply the need for external support or backup systems that are not necessary for the PAO/air cooling cart, highlighting its efficiency and standalone capability in managing cooling needs.