Which system is primarily used by ATC for sequencing and separating aircraft?

• A. Satellite navigation
• B. Radar
• C. Ground-based surveillance
• D. Visual flight rules

Answer: (B)

The primary system used by Air Traffic Control (ATC) for sequencing and separating aircraft is radar. Radar provides real-time information about the location, speed, and altitude of aircraft within a controlled airspace. By utilizing radar, controllers can effectively monitor the movement of multiple aircraft, ensuring safe distances are maintained and allowing for efficient traffic flow. This capability is crucial for preventing potential collisions and managing the complex task of air traffic management.

Other systems like satellite navigation and ground-based surveillance serve important roles in aviation but do not primarily focus on real-time separation and sequencing in the same direct manner as radar does. Visual flight rules rely more on pilots' visibility and situational awareness, placing less emphasis on ATC intervention in the traffic sequencing process. Radar's ability to provide a comprehensive and immediate picture of air traffic is what makes it the most essential tool for ATC in managing and maintaining safety within the skies.