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control centers, pilot reports, as well as their own
observations.
c. FAA FISDL (VHF) Service. The FAA's
FISDL (VHF datalink) system is a VHF Data Link
(VDL) Mode 2 implementation that provides pilots
and flight crews of properly equipped aircraft with a
cockpit display of certain aviation weather and flight
operational information. This information may be
displayed in both textual and graphical formats. The
system is operated under a service agreement with the
FAA, using broadcast data link on VHF aeronautical
spectrum on two 25 KHz spaced frequencies
(136.450 and 136.475 MHz). The FAA FISDL
(VHF) service is designed to provide coverage
throughout the continental U.S. from 5,000 feet AGL
to 17,500 feet MSL, except in areas where this is not
feasible due to mountainous terrain. Aircraft
operating near transmitter sites may receive useable
FISDL signals at altitudes lower than 5,000 feet
AGL, including on the surface in some locations,
depending on transmitter/aircraft line of sight
geometry. Aircraft operating above 17,500 feet MSL
may also receive useable FISDL signals under certain
circumstances.
1. FAA FISDL (VHF) service provides, free of
charge, the following basic text products:
(a) Aviation Routine Weather Reports
(METARs).
(b) Aviation Selected Special Weather
Reports (SPECIs).
(c) Terminal Area Forecasts (TAFs), and their
amendments.
(d) Significant Meteorological Information
(SIGMETs).
(e) Convective SIGMETs.
(f) Airman's Meteorological Information
(AIRMETs).
(g) Pilot Reports (both urgent and routine)
(PIREPs); and,
(h) Severe Weather Forecast Alerts and
Warnings (AWWs/WW) issued by the NOAA Storm
Prediction Center (SPC).
2. The format and coding of these text products
are described in Advisory Circular AC-00-45,
Aviation Weather Services, and paragraph 7-1-30,
Key to Aerodrome Forecast (TAF) and Aviation
Routine Weather Report (METAR).
2/14/08 AIM
Meteorology 7-1-23
3. Additional products, called “Value-Added
Products,” are also available from the vendor on a
paid subscription basis. Details concerning the
content, format, symbology and cost of these
products may be obtained from the vendor.
d. FAA's Flight Information Service-Broadcast
(FIS-B) Service. FIS-B is a ground broadcast
service provided through the FAA's Universal Access
Transceiver (UAT) “ADS-B Broadcast Services”
network. The UAT network is an ADS-B data link
that operates on 978 MHz. The FAA FIS-B system
provides pilots and flight crews of properly equipped
aircraft with a cockpit display of certain aviation
weather and flight operational information. The
FAA's FIS-B service is being introduced in certain
regional implementations within the NAS (e.g., in
Alaska and in other areas of implementation).
1. FAA's UAT FIS-B provides the initial
products listed below with additional products
planned for future implementation. FIS-B reception
is line of sight and can be expected within 200 NM
(nominal range) of each ground transmitting site. The
following services are provided free of charge.
(a) Text: Aviation Routine Weather Reports
(METARs).
(b) Text: Special Aviation Reports
(SPECIs).
(c) Text: Terminal Area Forecasts (TAFs),
and their amendments.
(d) Graphic: NEXRAD precipitation maps.
2. The format and coding of the above text
weather-related products are described in Advisory
Circular AC-00-45, Aviation Weather Services, and
paragraph 7-1-30, Key to Aerodrome Forecast
(TAF) and Aviation Routine Weather Report
(METAR).
3. Details concerning the content, format, and
symbology of the various data link products provided
may be obtained from the specific avionics
manufacturer.
e. Non-FAA FISDL Systems. Several commercial
vendors also provide customers with FIS data
over both the aeronautical spectrum and on other
frequencies using a variety of data link protocols. In
some cases, the vendors provide only the communications
system that carries customer messages,
such as the Aircraft Communications Addressing and
Reporting System (ACARS) used by many air carrier
and other operators.
1. Operators using non-FAA FIS data for
inflight weather and other operational information
should ensure that the products used conform to
FAA/NWS standards. Specifically, aviation weather
and NAS status information should meet the
following criteria:
(a) The products should be either FAA/NWS
“accepted” aviation weather reports or products, or
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