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hour befom the commencement of their period of validity,
unless othenvise determined by regional air navigation
agreement.
2.1.3 Heading of bulletins
Meteorological bulletins containing operational meteorological
information to be transmitted via the aeronautical fixed service
facilities shall contain a heading consisting of:
a) an identifier of four letters and two figures;
b) the ICAO four-letter location indicator corresponding to
the geographical location of the meteorological office
originating or compiling the meteorological bulletin;
c) a date-time group; and
d) if required, a three-letter indicator.
Note I.- Detailed specifications on format and contents of
the heading are given in the WMO Manual on the Global Telecommunication
System, Volume I and are reproduced in the
Manual of Aeronautical Meteorological Practice (Doc 8896).
ANNEX 3 APP 10-1
Annex 3 - Meteorological Service for International Air Navigation Appendix 10
Note 2.- ICAO location indicators are listed in Location 3.1.2 The contents and format of air-reports transmitted
Indicators (Doc 7910). by aircraft shall be consistent with the provisions of Chapter 5
of this Annex and the Procedures for Air Navigation Services
- Air Traffic Management (PANS-ATM, Doc 4444),
2.1.4 Structure of bulletins Appendix 1.
Meteorological bulletins containing operational meteorological
information to be transmitted via the AFTN shall be encapsulated
in the text part of the AFTN message format.
3.2 Content and format of
meteorological bulletins
The substance of a meteorological bulletin transmitted via the
2.2 World area forecast system products aeronautical mobile service shall remain unchanged from that
contained in the bulletin as originated.
2.2.1 Telecommunications for the supply
of WAFS products
Recommendation.- The telecommunications facilities
used for the supply of world area forecast system products
should be the aeronautical fured service.
2.2.2 Quality requirements for charts
Recommendation.- Where world area forecast system
products are disseminated in chart form, the quality of the
charts ,received should be such as to permit reproduction in a
sujiciently legible form forflight planning and documentation.
Charts received should be legible over 95 per cent of their
area.
. . . 2.2.3 Quality requirements for transmissions
Recommendation.- Transmissions should be such m to
ensure that their interruption should not exceed 10 minutes
during any period of 6 hours. '
2.2.4 Heading of bulletins
containing WAFS products
Meteorological bulletins containing WAFS products in digital
form to be transmitted via aeronautical fixed service facilities
shall contain a heading as given in 2.1.3.
4. USE OF AERONAUTICAL
DATA LINK SERVICE - D-VOLMET
4.1 Detailed content of meteorological information
available for D-VOLMET
4.1.1 Recommendation.- The aerodromes for which
METAR, SPECI and TAF are to be available for uplink to aircraft
in jlight should be determined by regional air navigation
agreement.
4.1.2 Recommendation.- The flight information
regions for which SZGMET and AZRMET messages are to be
available for uplink to aircrafl in jlight should be determined
by regional air navigation agreement.
4.2 Criteria related to information to
be available for D-VOLMET
4.2.1 Recommendation.- The latest available METAR,
SPECI, TAR SZGMET and AIRMET should be used for uplink
to aircraft in flight.
4.2.2 Recommendation, TAF included in the DVOLMET
should be amended m necessary to ensure that a
forecast, when made available for uplink to aircraft in flight,
reflects the latest opinion of the meteorological ojice
concerned.
4.2.3 Recommendation.- (f no SZGMET message is
available for afTight information region, an indication of "NIL
3. USE OF AERONAUTICAL MOBILE SZGMET" should be included in the D-YOLMET.
SERVICE COMMUNICATIONS
4.3 Format of information to be
3.1 Content and format of available for D-VOLMET
meteorological messages
The content and format of reports, forecasts and SIGMET and
3.1.1 The contents and format of reports, forecasts and AIRMET information included in D-VOLMET shall be con-
SlGMET information transmitted to aircraft shall be consistcnt sistent with the provisions of Chapters 4, 6 and 7 of this
with the provisions of Chapters 4, 6 and 7 of this Annex. Annex.
2511 1104 APP 10-2
Appendix 10 Annex 3 - Meteorological Service for International Air Navigation
5. USE OF AERONAUTICAL BROADCASTING
SERVICE - VOLMET BROADCASTS
5.1 Detailed content of meteorological information
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