How are communication frequencies listed on IAP Charts?

Communication frequencies on Instrument Approach Procedure (IAP) charts are listed in the order they are used during the approach and landing sequence. This organization helps pilots follow the necessary steps in a logical manner as they progress through the approach procedure. Each frequency corresponds to a specific phase of flight, such as initial contact with an air traffic controller, and is presented in a sequence that reflects the typical flow of operations.

This approach ensures that pilots can easily find and switch to the appropriate frequencies at the right times, enhancing safety and efficiency during an approach. By having the frequencies arranged based on their usage rather than alphabetical, numerical, or regional criteria, IAP charts facilitate a smoother transition from enroute navigation to landing, maintaining situational awareness for the pilot.