What is the primary function of engine throttles in an aircraft?

The primary function of engine throttles in an aircraft is to regulate thrust produced by the engine. Throttles are the controls that govern the amount of fuel and air mixture entering the engine, directly influencing the engine's power output and thrust. By adjusting the throttle settings, pilots can increase or decrease the thrust, allowing for various operational needs, such as climbing, cruising, or descending. This control is crucial for maintaining desired flight performance, responding to changing flight conditions, and ensuring the aircraft operates efficiently and safely.

While other aspects of flying, such as navigation, fuel management, and landing procedures, are essential for overall flight operations, they are not the primary function of engine throttles. Navigation is directed by other instruments and controls, fuel consumption is affected by the engine power settings but is not the direct control of the throttle itself, and landing procedures are influenced by multiple factors including speed and configuration rather than solely throttle adjustment.