Which system is responsible for supplying the propulsion energy to the aircraft?

• A. Landing Gear System
• B. Fuel System
• C. Powerplant
• D. Electrical System

Answer: (C)

Propulsion energy comes from the powerplant, the part of the aircraft that houses the engines. The powerplant takes the chemical energy stored in fuel and converts it into mechanical energy to generate thrust. In other words, the engine burns fuel to produce the force that pushes the aircraft forward. The fuel system’s job is to store and deliver fuel to the powerplant, not to supply propulsion energy directly. The electrical system provides power for lights, avionics, and other systems, while the landing gear supports the aircraft on the ground. So the powerplant is the system responsible for supplying propulsion energy.