Final answer:
Before connecting or disconnecting a PAO / air cooling cart in an aircraft, you must ensure it is grounded, to avoid any harmful static electricity buildup. This is a crucial safety practice in aviation.
Step-by-step explanation:
Before making or breaking a connection between a polyαolefin (PAO) / air cooling cart in the aircraft, the person must ensure ground connection or ground the cooling cart. This is to prevent buildup of static electricity which could cause damage to the equipment or spark a fire. This procedure is part of better safety practices in handling equipment particularly in the aviation industry where safety is a primary concern.
Learn more about Aircraft Safety