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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@) of the most appropriate terminal navigation
aid@), 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 immediatelv be made known to the ATS unit(s)
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 111, Part I,
Chapter 3.
4.3.6 Automatic terminal information
service (voice and/or data link)
. ,
concerned with the provision to aircraft of information relating 4.3.6.1 Whenever Voice-ATIS and/or D-ATIS is provided:
to approach, landing and take-off, whenever the message has
not been prepared by that (those) unit(s). a) the information communicated shall relate to a single
aerodrome;
Note.- The requirements for the provision of ATIS that
applies to both Voice-ATIS and D-ATIS are contained in 4.3.6 b) the information communicated shall be updated
below. immediately a significant change occurs;
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
identqcation signal of a navigation aid used for transmission
of ATIS. The ATlS broadcast message should take into
consideration human performance.
c) the preparation and dissemination of the ATIS message
shall be the responsibility of the air traffic services;
d) individual ATIS messages shall be identified by a
designator in the form of a letter of the ICAO spelling
alphabet. Designators assigned to consecutive ATIS
messages shall be in alphabetical order;
e) aircraft shall acknowledge receipt of the information
upon establishing communication with the ATS unit
providing approach control service or the aerodrome
control tower, as appropriate;
0 the appropriate ATS unit shall, when replying to the
message in e) above or, in the case of arriving aircraft,
at such other time as may be prescribed by the
appropriate ATS authority, provide the aircraft with the
current altimeter setting; and
Note.- Guidance material on human performance can be g) the meteorological information shall be extracted from
found in the Human Factors Training Manual (Doc 9683). the local meteorological routine or special report.
Chapter 4 Annex 11 - Air Traffic Services
Note.- In accordance with Annex 3, Sections 4.5 and 4.7,
the sulface wind direction and speed and runway visual range
(RVR) are to be averaged over 2 minutes and I minute,
respectively; and the wind information is to refer to conditions
along the runway for departing aircraft and' to conditions at
the touchdown zone for arriving aircraji. A template for the
local meteorological report, including the corresponding
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