^ a b c Transport Canada (April 2010).In Canada, the radio frequencies assigned for UNICOM are: Īirports without an Air Traffic Control tower or FSS on the airport. In the United States, radio frequencies made available by the Federal Communications Commission for use as UNICOM are: Īirports with an Air Traffic Control tower or FSS (Alaska only) on the airport. The actual frequency used at any particular airport can be found on the relevant sectional, terminal area chart or in airport directories, such as the Canada Flight Supplement. Many UNICOM stations are operated by a fixed-base operator (FBO), and it may be possible to request services such as fuel trucks, taxi service from the airport, outgoing phone calls, and others. When a part-time UNICOM station is located on the same airport as a part-time control tower, the same frequency will be used by both ground stations to avoid confusion. During these times, pilots self-announce their position and/or intentions over the CTAF frequency, which is often the same as the UNICOM frequency. In some cases, the ground station is not staffed, and attempts to communicate will, of course, receive no acknowledgement. Pilots who join the frequency later can request field advisories, which may include "weather information, wind direction, the recommended runway" and any previously reported traffic. Under this protocol, aircraft may call a non-government ground station to make announcements of their intentions. Some airfields always offer UNICOM service while others revert to UNICOM procedures only during hours when the control tower is closed. UNICOM stations typically use a single communications frequency. UNICOM is employed at airports with a low volume of general aviation traffic and where no control tower is active. The equivalent European/ICAO service is known as (aerodrome) flight information service, abbreviated as AFIS or FIS. It is also known as an aeronautical advisory station. A UNICOM ( universal communications) station is an air-ground communication facility operated by a non- air traffic control private agency to provide advisory service at uncontrolled aerodromes and airports and to provide various non-flight services, such as requesting a taxi, even at towered airports.
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