Airport terminal control facilities and radio communications associated with the airport shall be shown. When the call sign
is not the same as the airport name the call sign will be shown. Frequencies shall normally be shown in descending order
with the primary frequency listed first. Frequencies will be listed, together with sectorization indicated by outbound radials,
and hours of operation. Communications will be listed in sequence as follows:
Single Frequency Approach (SFA), Common Traffic Advisory Frequency (CTAF), Automatic Terminal Information Service (ATIS)
and Aeronautical Advisory Stations (UNICOM) or (AUNICOM) along with their frequency is shown, where available, on the
line following the heading ‘‘COMMUNICATIONS.’’ When the CTAF and UNICOM frequencies are the same, the frequency will
be shown as CTAF/UNICOM 122.8.
The FSS telephone nationwide is toll free 1–800–WX–BRIEF (1–800–992–7433). When the FSS is located on the field it will
be indicated as ‘‘on arpt’’. Frequencies available at the FSS will follow in descending order. Remote Communications
Outlet (RCO) providing service to the airport followed by the frequency and FSS RADIO name will be shown when available.
FSS’s provide information on airport conditions, radio aids and other facilities, and process flight plans. Airport Advisory
Service (AAS) is provided on the CTAF by FSS’s for select non-tower airports or airports where the tower is not in operation.
(See AIM, Para 4–1–9 Traffic Advisory Practices at Airports Without Operating Control Towers or AC 90–42C.)
Aviation weather briefing service is provided by FSS specialists. Flight and weather briefing services are also available by
calling the telephone numbers listed.
Remote Communications Outlet (RCO)—An unmanned air/ground communications facility that is remotely controlled and
provides UHF or VHF communications capability to extend the service range of an FSS.
Civil Communications Frequencies-Civil communications frequencies used in the FSS air/ground system are operated on
122.0, 122.2, 123.6; emergency 121.5; plus receive-only on 122.1.
a. 122.0 is assigned as the Enroute Flight Advisory Service frequency at selected FSS RADIO outlets.
b. 122.2 is assigned as a common enroute frequency.
c. 123.6 is assigned as the airport advisory frequency at select non-tower locations. At airports with a tower, FSS may
provide airport advisories on the tower frequency when tower is closed.
d. 122.1 is the primary receive-only frequency at VOR’s.
e. Some FSS’s are assigned 50 kHz frequencies in the 122–126 MHz band (eg. 122.45). Pilots using the FSS A/G
system should refer to this directory or appropriate charts to determine frequencies available at the FSS or remoted
facility through which they wish to communicate.
Emergency frequency 121.5 and 243.0 are available at all Flight Service Stations, most Towers, Approach Control and RADAR
facilities.
Frequencies published followed by the letter ‘‘T’’ or ‘‘R’’, indicate that the facility will only transmit or receive respectively on
that frequency. All radio aids to navigation (NAVAID) frequencies are transmit only.
