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Area Forecasts (TAFs), graphical weather products
such as radar composite or mosaic images, may be
provided to the cockpit. Two−way FISDL services
permit the pilot to make specific weather and
operational information requests for cockpit display.
2. FISDL services are available from the
following types of service providers.
(a) FIS providers operating under contract
with the FAA using VHF aeronautical spectrum
whose products are reviewed and accepted by the
FAA before being included in their transmission
service.
(b) FIS providers operating under private
contract using aeronautical spectrum.
(c) FIS providers operating under private
contract using other than aeronautical spectrum,
including Internet data providers.
3. FISDL is a method of disseminating
aeronautical weather and operational data that
augments pilot voice communication with Flight
Service Stations (FSS), other Air Traffic Control
(ATC) facilities, or Airline Operation Control
Centers (AOCC). FISDL does not replace pilot and
controller/flight service specialist or aircraft dispatcher
voice communication for weather or
operational information interpretation. However,
FISDL can provide background information that can
abbreviate and improve the usefulness of such
communication. FISDL enhances pilot situational
awareness and improves safety.
b. Operational Use of FISDL. Whether an FAA
or non−FAA FISDL system is being utilized, several
factors must be considered:
1. Before using FISDL for inflight operations,
pilots and other flight crewmembers should become
completely familiar with the operation of the FISDL
system to be used, including its system architecture,
airborne system components, modes of operation,
indications of various system failures, service
volume, and other limitations of the particular
system. Users should also be familiar with the
content, format, and application of the services and
products available from the FISDL provider(s).
Sources of this information include manufacturers’
manuals, training programs, and reference guides.
2. FISDL should not serve as the sole source of
aeronautical weather and operational information.
Air Traffic Control, Flight Service Station (FSS),
and, when applicable, AOCC VHF/HF voice
communication is the basic method of disseminating
aeronautical weather, special use airspace, NOTAMs,
and other operational information to aircraft inflight.
FISDL augments ATC/FSS/AOCC services and, in
some cases, offers the advantage of graphical data. By
using FISDL for orientation, the value of any
information received from conventional voice
sources may be enhanced. FISDL may alert the pilot
to specific areas of concern, which will more
accurately focus requests made to FSS or AOCC for
inflight briefings or queries made to ATC.
3. The aeronautical environment is constantly
changing; often these changes occur quickly, and
without warning. Critical decisions should be based
on the most current and appropriate data available.
When differences exist between FISDL and
information obtained by voice communication with
ATC, FSS, and/or AOCC, pilots are cautioned to use
the most recent data from the most authoritative
source.
4. FISDL products (e.g., ground−based radar
precipitation maps) are not appropriate for use in
tactical avoidance of severe weather conditions, such
as negotiating a path through a weather hazard area.
FISDL supports strategic weather decision−making,
such as route selection to avoid a weather hazard area
in its entirety. The misuse of information beyond its
applicability may place the pilot and aircraft in
jeopardy. In addition, FISDL should never be used in
lieu of an individual preflight weather and flight
planning briefing.
AIM 2/17/05
7−1−20 Meteorology
c. FAA’s VHF FISDL. The FAA’s VHF FISDL
system provides flightcrews with a cockpit display of
certain aeronautical weather and flight operational
information. This information is displayed in both
textual and graphical formats. Under a service
agreement with the FAA, the FISDL Service Provider
broadcasts FAA FISDL messages using VHF Data
Link. Two 25−kilohertz (KHz)−spaced frequencies
are assigned for FAA FISDL between 136.450 and
136.475 MHz, inclusive. The FAA FISDL provides
coverage throughout the continental United States
from 5,000 feet above ground level (AGL) to
17,500 feet mean sea level (MSL), except in those
areas where this is unfeasible because of mountainous
　
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