What is typically excluded from the definition of "airframe" in aviation?

In aviation, the term "airframe" typically refers to the structural components of an aircraft that provide its shape and support for various components, including the wings, fuselage, and landing gear. However, when considering what is excluded from this definition, it is important to note that internal systems, such as avionics, control systems, and the engine, do not fall under the category of the airframe.

The airframe can be thought of as the shell that holds everything together, while the internal systems and the engine are critical for the aircraft's operation but are considered separate from its structural framework. Understanding this distinction is essential because it helps delineate the various parts of an aircraft and their functionalities, ensuring clarity when discussing maintenance, design, and operational aspects of aviation.