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The United States has 22 Air Route Traffic Control Centers (ARTCC). [1] They are operated by and are part of the Federal Aviation Administration of the U.S. Department of Transportation . An ARTCC controls aircraft flying in a specified region of airspace, known as a flight information region (FIR), typically during the en route portion of flight.
Military aircraft also use a dedicated UHF-AM band from 225.0 to 399.95 MHz for air-to-air and air-to-ground, including air traffic control communication. This band has a designated emergency and guard channel of 243.0 MHz. [2] [8] Radio aeronautical navigation aids use other frequencies.
Common traffic advisory frequency (CTAF) is the name given to the VHF radio frequency used for air-to-air communication at United States, and Australian non-towered airports. Many towered airports close their towers overnight, keeping the airport open for cargo operations and other activity.
Area control centers (ACCs) control IFR air traffic in their flight information region (FIR). The current list of FIRs and ACCs is maintained by the International Civil Aviation Organization (ICAO). The following is the alphabetic list of all ACCs and their FIRs as of October 2011:
Area control centers (ACCs) control IFR air traffic in their flight information region (FIR). The current list of FIRs and ACCs is maintained by the International Civil Aviation Organization (ICAO). [4] Note that the cited ICAO source gives the shapefile coordinates for each FIR, and also its page source gives a list of current ACCs in text form.
The system is designed to accommodate air traffic growth and the introduction of new automation functions which will improve the safety and efficiency of the US National Airspace System (NAS). [ 5 ] Airport Surveillance Radar is beginning to be supplemented by ADS-B Automatic dependent surveillance-broadcast in the US and other parts of the world.
In U.S. and Canadian aviation, MULTICOM is a frequency allocation used as a Common Traffic Advisory Frequency by aircraft near airports where no air traffic control is available. Frequency allocations vary from region to region. Despite the use of uppercase letters, MULTICOM is not an abbreviation or acronym. In the United States, there is one ...
In the United States, radio frequencies made available by the Federal Communications Commission for use as UNICOM are: [8] Airports with an Air Traffic Control tower or FSS (Alaska only) on the airport. [8] 122.950 MHz; Airports without an Air Traffic Control tower or FSS on the airport. [8] 122.700 MHz; 122.725 MHz; 122.800 MHz; 122.975 MHz ...