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What is the frequency for reporting aircraft positions at an airport when the tower is closed?

  1. Ground Control Frequency

  2. Traffic Control Frequency

  3. Common Traffic Advisory Frequency (CTAF)

  4. Aerial Advisory Frequency

The correct answer is: Common Traffic Advisory Frequency (CTAF)

The correct frequency for reporting aircraft positions at an airport when the tower is closed is the Common Traffic Advisory Frequency (CTAF). This frequency is specifically established to promote safety by allowing pilots to communicate their intentions to other pilots in the area, providing information about their positions and movements. When a control tower is not in operation, the CTAF enables pilots to share critical information, making it essential for maintaining situational awareness and avoiding potential conflicts in the airspace surrounding airports. The Ground Control Frequency is used for communication with ground control when the tower is operational, typically concerning taxiing on the ground rather than in-flight position reporting. The Traffic Control Frequency pertains to communication with air traffic control during managed operations, which is not applicable when a tower is closed. Lastly, the Aerial Advisory Frequency is not a standard designated frequency recognized in aviation for these purposes, further qualifying CTAF as the most appropriate choice for reporting positions at airports when the tower is not active.