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Have you ever seen a large hose connected to the fuselage of an airplane while it's parked? That's not for charging; it's for an external air conditioning system. When the plane is stopped on the tarmac, the main engines are turned off to save fuel. However, the airplane cabin must still be cool. Therefore, an external cooling unit is used. These units are installed outside and pump cool air directly into the cabin. This system works similarly to a regular air conditioner but has a large capacity and is connected to the fuselage via flexible ducts. This ensures that the cabin temperature remains stable before takeoff without turning on the main engines.


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