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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;
n) supplementary information on recent weather of operational
significance and, where necessary, wind shear;
o) trend forecast, when available; and
p) notice of current SIGMET messages.
4.3.4 Voice-automatic terminal information
service (Voice-ATIS) broadcasts
4.3.4.1 Voice-automatic terminal information service
(Voice-ATIS) broadcasts shall be provided at aerodromes
where there is a requirement to reduce the communication load
on the ATS VHF air-ground communication channels. When
provided, they shall comprise:
* These elements are replaced by the term “CAVOK”, whenever the
conditions as specified in the PANS-ATM (Doc 4444), Chapte r11
prevail.
† As determined on the basis of regional air navigation agreements.
Annex 11 — Air Traffic Services Chapter 4
1/11/01 4-4
a) one broadcast serving arriving aircraft; or
b) one broadcast serving departing aircraft; or
c) one broadcast serving both arriving and departing
aircraft; or
d) two broadcasts serving arriving and departing aircraft
respectively at those aerodromes where the length of a
broadcast serving both arriving and departing aircraft
would be excessively long.
4.3.4.2 A discrete VHF frequency shall, whenever
practicable, be used for Voice-ATIS broadcasts. If a discrete
frequency is not available, the transmission may be made on
the voice channel(s) of the most appropriate terminal navigation
aid(s), preferably a VOR, provided the range and
readability are adequate and the identification of the navigation
aid is sequenced with the broadcast so that the latter is
　
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