What is NOT a function of the engine cowling?

The correct answer is that securing the engine to the frame is not a function of the engine cowling. The primary purpose of the cowling is to enhance the aerodynamics of the aircraft, which includes functions like decreasing drag and directing airflow to the engine. Additionally, it plays a significant role in protecting the engine components from environmental factors and foreign objects, ensuring the engine operates smoothly and effectively.

The cowling is designed to allow airflow to reach the engine for cooling purposes while maintaining streamlined airflow around the aircraft to reduce air resistance. Although the cowling does contribute to the overall structure of the aircraft, its main role is not to secure the engine to the fuselage; this function is typically fulfilled by the engine mounts and other structural components of the aircraft's frame.