Which of the following is NOT a function of Air Traffic Control?

Aircraft maintenance is outside the scope of Air Traffic Control (ATC) functions. ATC is primarily responsible for ensuring the safe and efficient movement of aircraft in the airspace and on the ground. This includes monitoring weather conditions to provide pilots with critical updates necessary for safe navigation, assigning flight paths to optimize air traffic flow, and coordinating takeoffs and landings to prevent collisions and ensure orderly traffic around airports. While ATC plays a vital role in flight safety, aircraft maintenance involves technical checks and repairs that are typically handled by maintenance crews and certified mechanics, making it a distinct area of aviation operations separate from air traffic management.