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be continued for a period to be determined by agreement
between the meteorological and air traffic services 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 concerning 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 concerning navigation aids and aerodromes
Annex 11 — Air Traffic Services Chapter 4
1/11/01 4-2
included in the flight information service shall, whenever
available, be provided in an operationally integrated form.
4.3.1.2 Recommendation.— Where integrated operational
flight information messages are to be transmitted to
aircraft, 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 flight 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
name of the aerodrome 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;
g) the full broadcast message should be repeated if this is
feasible within the remainder of the time allotted to the
broadcasting station;
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 development
and adoption of a more suitable form of speech for universal
use in aeronautical radiotelephony communications, HF OFIS
broadcasts concerning aerodromes designated for use by
international air services should be available in the English
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 operational flight information
service broadcast messages should contain the following
information in the sequence indicated or as determined by
regional air navigation agreements:
a) En-route weather information
Information on significant en-route weather phenomena
should be in the form of available SIGMET as prescribed
in Annex 3.
b) Aerodrome information including:
1) name of aerodrome;
2) time of observation;
3) essential operational information;
4) surface wind direction and speed; if appropriate,
maximum wind speed;
*5) visibility and, when applicable, runway visual range
(RVR);
*6) present weather;
*7) cloud below 1 500 m (5 000 ft) or below the highest
minimum sector altitude, whichever is greater;
cumulonimbus; if the sky is obscured, vertical
visibility when available; and
8) aerodrome forecast.
* These elements are replaced by the term “CAVOK”, whenever the
　
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