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is available on some facilities. Hazardous Inflight
Weather Advisory Service (HIWAS) broadcast
capability is available on selected VOR sites
throughout the conterminous U.S. and does not
provide two-way voice communication. The availability
of two-way voice communication and HIWAS
is indicated in the A/FD and aeronautical charts.
3.1.5.2Unless otherwise noted on the chart, all radio
navigation aids operate continuously except during
shutdowns for maintenance. Hours of operation of
facilities not operating continuously are annotated on
charts and in the Airport/Facility Directory.
3.2Mobile Service
3.2.1The aeronautical stations (Airport Traffic
Control Towers, Air Route Traffic Control Centers,
and Flight Service Stations) maintain a continuous
watch on their assigned frequencies during the
published hours of service unless otherwise notified.
An aircraft should normally communicate with the
air−ground control radio station which exercises
control in the area in which it is flying. Aircraft
shouldmaintain continuous watch on the appropriate
frequency of the control station and should not
abandon watch, except in an emergency, without
informing the control radio station.
3.2.2Flight Service Stations (FSSs) are allocated
frequencies for different functions. For Airport
Advisory Service, the pilot should contact the FSS on
123.6 MHz. Individually assigned FSS frequencies
are listed in Airport/Facility Directory under the FSS
entry. If you are in doubt as to what frequency to use
to contact an FSS, transmit on 122.1 MHz and advise
the FSS of the frequency on which you are receiving.
3.3Fixed Service
3.3.1Messages to be transmitted over the Aeronautical
Fixed Service are accepted only if they satisfy the
requirements of:
3.3.1.1ICAO Annex 10, Vol. II, Chapter 3,
paragraph3.3.
3.3.1.2Are prepared in the form specified in
Annex10.
3.3.1.3The text of an individual message does not
exceed 200 groups.
3.3.2General aircraft operating messages, Class B
traffic, including reservation messages pertaining to
flights scheduled to depart within 72 hours, shall not
be acceptable for transmission over U.S. government
operated telecommunications circuits except in those
AIP
United States of America
GEN 3.4−5
15 MAR 07
Federal Aviation Administration Nineteenth Edition
cases where it has been determined by the U.S. that
adequate non−government facilities are not available.
3.4Broadcast Service
3.4.1The following meteorological broadcasts are
available for the use of aircraft in flight:
3.4.1.1LF Transcribed Weather Broadcast (TWEB).
3.4.1.2Sub−Area Meteorological Broadcast
(Volmet).
3.4.1.3VHF RTF Meteorological Broadcasts.
3.4.2Full details of broadcast service are given in
GEN 3.5, Meteorological Services.
3.4.3All broadcast services to aircraft are provided
in the English language only.
4. Aeronautical Fixed Services
4.1General
4.1.1All U.S. ATC facilities have the ability to
communicate with all other ATS facilities via either
telephone or other domestic telecommunications
systems. Circuit diagrams depicting these connections
are not available for this publication due to the
number of ATS facilities available in the U.S.
4.2The Domestic Telecommunications Network
4.2.1The U.S. Domestic telecommunications
network is an automated system operating through
the National Airspace Data Interchange Network
(NADIN) in Atlanta, GA, and Salt Lake City, NV. All
Flight Service Stations (FSS) and Air Route Traffic
Control Centers (ARTCC) connect through the
NATCOM. All FSS and ARTCC facilities have both
transmit and receive capabilities.
4.2.2Airport Air Traffic Control Towers (ATCT)
and Approach Control (A/C) Facilities do not connect
with this system. Messages originating from or
destined to these facilities are relayed through the
associated FSS. Associated FSSs for these facilities
are listed in the Airport/Facility Directory.
4.2.3Airport administrative offices, airport managers
or airport administrative officials do not normally
connect with the domestic telecommunications
network. Urgent messages destined to these facilities
must be forwarded to the associated FSS for relay or
the message must be sent through commercial
telegraphic systems.
4.3The International Message Network
(Aeronautical Fixed Telecommunications
Network−AFTN)
4.3.1AFTN messages originating from outside the
U.S. domestic telecommunications system must be
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