What defines a "clean configuration" in aviation?

A "clean configuration" in aviation refers to a situation where the aircraft is in a streamlined state, typically achieved when the landing gear and flaps are retracted. This setup minimizes drag, allowing for better aerodynamic efficiency and performance during flight.

When an aircraft is in a clean configuration, it can achieve a higher airspeed and improved fuel efficiency, which is essential for various phases of flight such as climbing and cruising. In contrast, configurations involving extended landing gear and flaps increase drag and are usually employed during landing or in low-speed maneuvers, which is why they don’t represent a clean configuration.

The term is particularly significant in the context of performance calculations, as flying in a clean configuration can allow for better stability and control while maximizing lift-to-drag ratios. Understanding clean configuration is crucial for pilots as it impacts the aircraft's performance and handling characteristics during different flight conditions.