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n) supplementary information on recent weather of operational
significance and, where necessary, wind shear;
o) trend forecast, when available; and
p) notice of current SIGMET messages.
4.3.4 Voice-automatic terminal information
service (Voice-ATIS) broadcasts
4.3.4.1 Voice-automatic terminal information service
(Voice-ATIS) broadcasts shall be provided at aerodromes
where there is a requirement to reduce the communication load
on the ATS VHF air-ground communication channels. When
provided, they shall comprise:
* These elements are replaced by the term “CAVOK”, whenever the
conditions as specified in the PANS-ATM (Doc 4444), Chapte r11
prevail.
† As determined on the basis of regional air navigation agreements.
Annex 11 — Air Traffic Services Chapter 4
1/11/01 4-4
a) one broadcast serving arriving aircraft; or
b) one broadcast serving departing aircraft; or
c) one broadcast serving both arriving and departing
aircraft; or
d) two broadcasts serving arriving and departing aircraft
respectively at those aerodromes where the length of a
broadcast serving both arriving and departing aircraft
would be excessively long.
4.3.4.2 A discrete VHF frequency shall, whenever
practicable, be used for Voice-ATIS broadcasts. If a discrete
frequency is not available, the transmission may be made on
the voice channel(s) of the most appropriate terminal navigation
aid(s), preferably a VOR, provided the range and
readability are adequate and the identification of the navigation
aid is sequenced with the broadcast so that the latter is
not obliterated.
4.3.4.3 Voice-ATIS broadcasts shall not be transmitted
on the voice channel of an ILS.
4.3.4.4 Whenever Voice-ATIS is provided, the broadcast
shall be continuous and repetitive.
4.3.4.5 The information contained in the current broadcast
shall immediately be made known to the ATS unit(s)
concerned with the provision to aircraft of information relating
to approach, landing and take-off, whenever the message has
not been prepared by that (those) unit(s).
Note.— The requirements for the provision of ATIS that
applies to both Voice-ATIS and D-ATIS are contained in 4.3.6
below.
4.3.4.6 Recommendation.— Pending the development
and adoption of a more suitable form of speech for universal
use in aeronautical radiotelephony communications, Voice-
ATIS broadcasts provided at aerodromes designated for use by
international air services should be available in the English
language.
4.3.4.7 Recommendation.— Where Voice-ATIS broadcasts
are available in more than one language, a discrete
channel should be used for each language.
4.3.4.8 Recommendation.— The Voice-ATIS broadcast
message should, whenever practicable, not exceed 30 seconds,
care being taken that the readability of the ATIS message is
not impaired by the speed of the transmission or by the
identification signal of a navigation aid used for transmission
of ATIS. The ATIS broadcast message should take into
consideration human performance.
Note.— Guidance material on human performance can be
found in the Human Factors Training Manual (Doc 9683).
4.3.5 Data link-automatic terminal
information service (D-ATIS)
4.3.5.1 Where a D-ATIS supplements the existing
availability of Voice-ATIS, the information shall be identical
in both content and format to the applicable Voice-ATIS
broadcast.
4.3.5.1.1 Where real-time meteorological information is
included but the data remains within the parameters of the
significant change criteria, the content, for the purpose of
maintaining the same designator, shall be considered identical.
Note.— Significant change criteria are specified in Annex 3,
4.3.4.
4.3.5.2 Where a D-ATIS supplements the existing
availability of Voice-ATIS and the ATIS requires updating,
Voice-ATIS and D-ATIS shall be updated simultaneously.
Note.— Guidance material relating to D-ATIS is contained
in the Manual of Air Traffic Services Data Link Applications
(Doc 9694). The technical requirements for the D-ATIS
application are contained in Annex 10, Volume III, Part I,
Chapter 3.
4.3.6 Automatic terminal information
service (voice and/or data link)
4.3.6.1 Whenever Voice-ATIS and/or D-ATIS is provided:
a) the information communicated shall relate to a single
aerodrome;
b) the information communicated shall be updated
immediately a significant change occurs;
c) the preparation and dissemination of the ATIS message
shall be the responsibility of the air traffic services;
　
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