Final answer:
To get avionics cooling in an air conditioner ground unit, press the 'cool' button or adjust the temperature control to a lower setting.
Step-by-step explanation:
To get avionics cooling in an air conditioner ground unit, you usually need to press the 'cool' button or adjust the temperature control to a lower setting. The air conditioner will then cool the air inside the unit, which in turn can help cool the avionics equipment.