The primary source of AC electrical power is the ________.

The primary source of AC electrical power onboard the CRJ550 is the engine driven Integrated Drive Generator (IDG). The IDG plays a crucial role in converting the mechanical energy produced by the aircraft's engines into electrical energy, efficiently supplying the aircraft's various electrical systems while the engines are running.

The IDG is designed to respond to varying loads and maintain a stable output of AC power, which is essential for the operation of onboard systems such as avionics, lighting, and environmental controls. Its integrated design, which includes both a generator and a constant-speed drive, allows for reliable performance across a range of operational conditions.

While battery power supplies the aircraft with DC electrical power, particularly during ground operations and emergency scenarios, they do not serve as the primary source for AC power during normal flight operations. The external power unit can provide AC power when the aircraft is on the ground, but it is not used as the primary source during flight. Similarly, solar panel systems, while effective in some applications, are not employed as a primary power source in the CRJ550.

Thus, the Integrated Drive Generator is the dominant source of AC electrical power, ensuring all necessary systems function correctly throughout the flight.