What is the primary function of an aircraft engine?

The primary function of an aircraft engine is to provide thrust for propulsion. This involves converting fuel into mechanical energy, which in turn creates the thrust necessary to propel the aircraft forward through the air. The engines work based on principles of physics and aerodynamics, specifically by generating jet propulsion in jet engines or producing rotational energy in piston engines.

While other systems in an aircraft may perform functions such as generating electricity, heating the cabin, or assisting in navigation, these roles are secondary and rely on separate systems designed explicitly for those tasks. The central role of the engine remains focused on delivering the necessary force to overcome drag and achieve flight, making thrust generation the fundamental purpose of an aircraft engine.