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Note 2.- When there is a need to supplement collision
hazard information provided in compliance with b), or in case
of temporary disruption of flight information service, traffic
informution broadcasts by aircraft may be applied in
designated airspaces. Guidance on traffic infomiion broadcasts
by aircraft and related operating procedures is contained
in Attachment C.
4.2.3 Recommendation.- ATS units should transmit, as
soon as practicable, special air-reports to other aircr@
concerned, to the associated meteorological oftice, and to
other ATS units concerned. Transmissions to aircraft shouM
be continued for a period to be determined by agreement
between the meteorological and air trafJic sewices authorities
concerned.
4.2.4 Flight information service provided to VFR flights
shall include, in addition to that outlined in 4.2.1, the provision
of available information conceming traffic and weather conditions
along the route of flight that are likely to make operation
under the visual flight rules impracticable.
4.3 Operational flight information
service broadcasts
4.3.1 Application
4.3.1.1 The meteorological information and operational
information conceming navigation aids and aerodromes
Annex 11 -Air Traffic Services Chapter 4
included in the flight information service shall, whenever
available, be provided in an operationally integrated form.
4.3.1.2 Recommendation.- Where integrated operational
jlight information messages are to be transmitted to
aircrafr, they should be transmitted with the content and,
where specified, in the sequence indicated, for the various
phases of flight.
4.3.1.3 Recommendation.- Operational flight information
service broadcasts, when provided, should consist of
messages containing integrated information regarding selected
operational and meteorological elements appropriate to the
various phases of flight. These broadcasts should be of three
major types, i.e. HF, VHF and ATIS.
4.3.2 HF operational flight information
service (OFIS) broadcasts
4.3.2.1 Recommendation.- HF operational jlight information
service (OFIS) broadcasts should be provided when it
has been determined by regional air navigation agreements
that a requirement exists.
4.3.2.2 Recommendation.- Whenever such broadcasts
are provided:
a) the information should be in accordance with 4.3.2.5, as
applicable, subject to regional air navigation agreements;
b) the aerodromes for which reports and forecasts are to
be included should be as determined by regional air
navigation agreements;
c) the time-sequencing of stations participating in the
broadcast should be as determined by regional air
navigation agreements;
d) the HF OFIS broadcast message should take into
consideration human performance. The broadcast message
should not exceed the length of time allocated for it
by regional air navigation agreements, care being taken
that the readability is not impaired by the speed of the
transmission;
Note.-- Guidance material on human performance
can be found in the Human Factors Training Manual
(Doc 9683).
e) each aerodrome message should be identified by the
nume uf rhe uerudrume to which the information
applies;
f) when information has not been received in time for a
broadcast, the latest available information should be
included together with the time of that observation;
h) the broadcast information should be updated immediately
a significant change occurs; and
i) the HF OFIS message should be prepared and disseminated
by the most appropriate unit(s) as designated by
each State.
4.3.2.3 Recommendation.- Pending the developmmi
and adoption of a more suitable form of speech for universal
use in aeronautical radiotelephony communications, HF Om
broadcasts concerning aerodromes designated for use b),
international air services should be available in the EngZrM
language.
4.3.2.4 Recommendation.- Where HF OFIS broadcasts
are available in more than one language, a discrete channel
should be used for each language.
4.3.2.5 Recommendation.- HF operationaljlight information
service broadcast messages should contain the follow&@
information in the sequence indicated or as determined by
regional air navigation agreements:
a) En-route weather information
Infonmtion on significant en-route weather p h e m e
should be in theform of available SICMET as p r e s c ~ h d
in Annex 3.
b) Aerodrome information including:
I ) name of aerodrome;
2) time of observation;
3) essential operational information;
4) surface wind direction and speed; if appropriate,
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