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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
conditions as specified in the PANS-ATM (Doc 4444), Chapte r11
prevail.
Chapter 4 Annex 11 — Air Traffic Services
4-3 1/11/01
4.3.3 VHF operational flight information
service (OFIS) broadcasts
4.3.3.1 Recommendation.— VHF operational flight
information service 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 identified 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 OFIS 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 performance
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 OFIS 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
by international air services should be available in the English
language.
4.3.3.4 Recommendation.— Where VHF OFIS broadcasts
are available in more than one language, a discrete
channel should be used for each language.
4.3.3.5 Recommendation.— VHF operational flight
information service broadcast messages should contain the
following information in the sequence indicated:
a) name of aerodrome;
b) time of observation;
c) landing runway;
d) significant runway surface conditions and, if appropriate,
braking action;
e) changes in the operational state of the navigation aids,
if appropriate;
f) holding delay, if appropriate;
g) surface wind direction and speed; if appropriate,
maximum wind speed;
*h) visibility and, when applicable, runway visual range
(RVR);
*i) present weather;
*j) 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;
†k) air temperature;
†l) dew point temperature;
†m) QNH altimeter setting;
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