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The main source of electrical power for the Boeing 727 is the three engine-driven generators. These generators are essential for providing the necessary electrical power during flight and are driven by the aircraft's engines. When the engines are operating, they generate electricity that supports various systems on the aircraft, including navigation, communication, lighting, and other critical systems needed for the safe operation of the flight.

Using engine-driven generators as the primary source of electrical power is a common design in commercial aircraft as it offers reliability and sufficient capacity to meet the demands of all onboard systems during different phases of flight. While the aircraft can indeed utilize a battery for starting systems and backup power, and ground power units are used while on the ground for maintenance or pre-flight preparation to power systems without relying on the engines, these sources do not serve as the main power source during normal operations in the air. Solar panels are not a consideration for the electrical system in the B727 or most conventional aircraft at this time.