What does "transponder mode C" help air traffic control achieve?

• A. Air traffic management in low traffic areas.
• B. Enhanced situational awareness with altitude reporting.
• C. Accurate passenger counts during flights.
• D. Coordination with ground services.

Answer: (B)

Transponder mode C is an important tool in air traffic control because it provides enhanced situational awareness, specifically through altitude reporting. When an aircraft is equipped with this mode, it transmits both its identification and its altitude data to air traffic control. This information allows controllers to monitor the altitude of an aircraft in real-time, helping them ensure safe vertical separation between different aircraft flying in the same airspace.

With this altitude reporting, air traffic control can make more informed decisions about routing and spacing, particularly in busy air traffic environments where maintaining safe distances is critical. It significantly aids air traffic management by giving controllers a clear picture of where each aircraft is positioned, including how high it is flying. Thus, transponder mode C plays a vital role in maintaining safety and improving the efficiency of air traffic operations.