What is the frequency used for transmitting advisories while operating to or from an airport without an operating tower?

The Common Traffic Advisory Frequency (CTAF) is specifically designated for use at airports without an operating control tower. It serves as a communication channel that allows pilots to broadcast their intentions and receive information about other aircraft in the vicinity. This frequency helps enhance situational awareness for all pilots operating in the airport's vicinity, thereby promoting safety during takeoffs, landings, and other flight operations.

CTAF is vital for managing traffic and ensuring that pilots can communicate their positions, intentions, and any potential hazards. Pilots use this frequency to announce their arrival, departure, and maneuver intentions, allowing everyone in the area to be informed and to coordinate accordingly. The standardization of this frequency across non-towered airports helps ensure consistent communication practices among pilots, regardless of their flight experience or the region in which they are operating.

While the other options refer to frequencies used in aviation, they do not fulfill the specific function of transmitting advisories at non-towered airports. Therefore, the Common Traffic Advisory Frequency is the most appropriate choice for this context.