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There are also CTAF(R) landing strips which require the aircraft intending to enter the area of operation to be fitted with a radio. The most common CTAF frequency is 126.7 MHz [1] at non-towered aerodromes, except for when two CTAF airports are near each other. Aerodromes using CTAF outside tower hours typically nominate a frequency that is ...
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. The purpose of control is to promote the safe, orderly, and expeditious flow of air traffic [ 2 ] and prevent collisions.
A center's communication frequencies (typically in the very high frequency aviation bands, using amplitude modulation (AM) 118 MHz to 137 MHz, for overland control) are published in aeronautical charts and manuals, and are also announced to a pilot by the previous controller during a hand-off. Most VHF radio assignments also have a UHF (225 to ...
Airband or aircraft band is the name for a group of frequencies in the VHF radio spectrum allocated to radio communication in civil aviation, sometimes also referred to as VHF, or phonetically as "Victor".
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 MULTICOM frequency: 122.9 MHz. (See AIM table 4-1-2 or AIM table 4-1-1) At uncontrolled airports without a UNICOM, pilots are to self-announce on the MULTICOM frequency.
Before 1 October 2002 it was known as the Global High Frequency System (GHFS). HFGCS stations tend to operate in the aviation bands clustered around 5, 6, 8 and 11/12 MHz, although other frequencies are in use. The primary HFGCS voice frequencies are 4724.0 kHz, 8992.0 kHz, 11175.0 kHz, and 15016.0 kHz.
This information is displayed on the radar screen beside the aircraft's icon for use by the air traffic controller. The transponder code is assigned to the aircraft by the air traffic controller before takeoff. Controllers use the term "squawk" when they are assigning a transponder code, e.g., "Squawk 7421".
A map showing the borders of the United States' flight information regions as well as that of Canada and other neighboring nations. Old Federal Aviation Administration airspace map of ARTCCs in the United States overlaid with what states they cover Flight Information Regions (FIR) of France FIR and jurisdictional airspace in Japan FIR and jurisdictional airspace in South Korea