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Aviation Communications Frequencies Overview

An overview of aviation communications frequencies. In General Aviation, the VHF band used is between 118,000 and 136,975MHz, amplitude modulated (AM).

Facility Purpose Frequency
MULTICOM Air to air communication at airports without air-ground communication facilities (Class G airspace). The communications are made over the FAA's Common Traffic Advisory Frequency (CTAF). 122.9 MHz
Airport UNICOM To provide airport information. Note that this is a non government communication facility (Class E airspace). The communications are made over the FAA's Common Traffic Advisory Frequency (CTAF). *)
Often used:
FAA Flight Service Station (FSS) Provides information and services to pilots. *)
Airport Traffic Control (Tower) Coordinate operations on the runways and in Class B, C and D airspace. *)
Clearance Delivery Position Responsible for transmitting departure clearances to IFR flights. Frequency broadcast by ATIS.
Ground Control Position in Tower Responsible for controlling aircraft taxiing to and from the runways. *)
Often used:
Rader or Nonrader Approach Control Position Provides approach IFR control services *)
Rader Departure Control Position Provides departure IFR control services *)
FAA Air Route Traffic Control Center (ARTCC)
Note that an ARTCC is an ACC (Area Control Center) in ICAO terminology.
To maintain separation between IFR flights, and between IFR and known VFR flights. *)
Emergency call (MayDay, MayDay, MayDay, ..) States that you are in serious trouble and need help immediately. 121.5 MHz

*) = Look up in Airport/Facility directory, under city name. Or, use Aeronautical charts, in the airport data block. Note that the A/FD is published on the Internet by the FAA AVN

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