What does the powerplant in an aircraft include?

The powerplant of an aircraft refers specifically to the arrangement of the engines and the propulsion system. This includes both the engine(s) that generate thrust and any associated components, such as fuel systems, exhaust systems, and sometimes even the propellers or turbine systems (depending on the type of aircraft). The powerplant is crucial because it provides the necessary power to propel the aircraft through the air.

In contrast, the cockpit instruments are part of the flight deck that assist the pilot in navigation and control, not part of the powerplant. The wings are essential for lift and support during flight but do not contribute to propulsion. Similarly, the landing gear is crucial for takeoff, landing, and ground handling but is not involved in generating thrust or power. Thus, the only correct choice that accurately encompasses the elements involved in aircraft propulsion is the engines and propulsion system.