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use in aeronautical radiotelephony communications, HF OFZS
broadcasts concerning aerodromes designated for use by
international air services should be available in the English
language.
When requested by the piiot, the applicable OFIS message(s)
shall be transmitted by the appropriate ATS unit. 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 HF operational flight infonnation
service (OFIS) broadcasts 4.3.2.5 Recommendation.- HF operational flight information
service broadcast messages should contain the following
4.3.2.1 Recommendation.- HF opemtional flight infor- information in the sequence indicated or as defermined by
mation service (OFIS) broadcasts should be provided when it regional air agreements:
has been determined by regional air navigation agreements
that a requirement exists. a) En-route weather information
4.3.2.2 Recommendation.- Whenever such broadcasts Information on significant en-mute weather phenomena
are provided: should be in the form of available SIGMETas prescribed
in Annex 3.
a) the information should be in accordance with 4.3.2.5, as
applicable, subject to regional air navigation agreements; b) Aerodrome information including:
b) the aerodromes for which reoorts and forecasts are to 1) name of aerodrome;
be included should be as dlterminedvby regional air
navigation agreements; 2) rime of observation;
c) the time-sequencing of stations participating in the 3) essential operational information;
broadcast should be as determined by regional air 4) surjiace wind direction and speed; if appropriate,
navigation agreements; maximum wind speed;
d) the HF OFIS broadcast message should take into consideration
human perJormance. The broadcast message
should not exceed the length of rime 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 infonnation 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;
*5) visibility and, when applicable, runway visual range
(RVR):
*6) present weather;
*7) cloud below 1 500 m (5 000 fr) or below the highest
mininutm sector altirude, whichever is greatec cumulonimbus;
if the sky is obscured, vertical visibility
when available; and
8) aerodrome forecast.
* These elements are replaced by the tenn "CAVOK", whenever the
conditions as specified in the PANS-ATM (Doc 4444, Chapter 11
prevail.
24111105
No. 43
Chapter 4 Annex II - Air Traffic Services
4.3.3 VHF operational flight information
service (OFIS) broadcasts
4.3.3.1 Recommendation.- VHF operational jlight
information sewice broadcasts should be provided as
determined by regional air navigation agreements.
4.3.3.2 Recommendation.- Whenever such broadcasts
are provided:
a) the aerodromes for which reports and forecasts are to
be included should be as determined by regional air
navigation agreements:
b) each aerodrome message should be identijied by the
name of the aerodrome to which the information
applies;
c) 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;
d) the broadcasts should be continuous and repetitive;
e) The VHF OFlS broadcast message should take into
consideration human performance. The broadcast message
should, whenever practicable, not exceed five
minutes, care being taken that the readability is not
impaired by the speed of the transmission;
Note.- Guidance material on human peformance
can be found in the Human Factors Training Manual
(Doc 9683).
f) the broadcast message should be updated on a
scheduled basis as determined by regional air navigation
agreements. In addition it should be expeditiously
updated immediately a significant change occurs: and
g) the VHF OFlS message should be prepared and
disseminated by the most appropriate unit(s) as
designated by each State.
4.3.3.3 Recommendation.- Pending the development
and adoption of a more suitable form of speech for universal
use in aeronautical radiotelephony communications, VHF
OFIS broadcasts concerning aerodromes designated for use
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