Which factor listed below is NOT a consideration for determining the level of ATC Facilities?

• A. Volume of air traffic
• B. Number of runways
• C. Type of navigation systems
• D. Surrounding terrain

Answer: (C)

The factor that is not a consideration for determining the level of ATC facilities is the type of navigation systems. While the navigation systems are certainly important for safe operations and may influence how air traffic is managed, they do not directly dictate the level of ATC facilities required at an airport.

Levels of ATC facilities are primarily influenced by operational needs such as the volume of air traffic—how many flights are arriving and departing—and the number of runways, which affects capacity and the ability to handle concurrent operations. Surrounding terrain also plays a significant role, as it can impact approaches, departures, and communication with aircraft.

By focusing on the traffic volume, runway availability, and terrain, air traffic control can assess the complexity of operations needed and calibrate the facilities accordingly. Navigation systems support these operations but do not determine the facility's foundational requirements.