Which item is listed as being powered by the ADG?

• A. ADG bus
• B. HEFAS
• C. Flaps and slats at 1/2 speed
• D. Stab trim channel two

Answer: (A)

When power is lost and the airplane needs emergency electrical power, the aircraft uses an air-driven generator to feed a dedicated power path known as the ADG bus. This bus is designed specifically to carry emergency power to the most critical systems so you can continue safe flight and control. That’s why the item listed as being powered by the ADG is the ADG bus—it’s the direct destination for the emergency power produced by the generator.

The other items aren’t the targets for the ADG’s output. HEFAS isn’t a defined emergency electrical load fed by the ADG, and flap/slat movement at reduced speed and stab trim channel two are driven by other systems (primarily hydraulics or separate control buses) that aren’t the purpose of the ADG bus in an electrical emergency.