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9.1.3.1.2 The use of general calls shall be limited to
cases where it is necessary to disseminate essential information
to several aircraft without delay, e.g. the sudden
occurrence of hazards, a change of the runway-in-use, or the
failure of a key approach and landing aid.
9.1.3.2 TRANSMISSION OF SPECIAL AIR-REPORTS,
SIGMET AND AIRMET INFORMATION
9.1.3.2.1 Appropriate SIGMET and AIRMET information,
as well as special air-reports which have not been used
for the preparation of a SIGMET, shall be disseminated to
aircraft by one or more of the means specified in 9.1.3.1.1 as
determined on the basis of regional air navigation agreements.
9.1.3.2.2 The special air-report, SIGMET and AIRMET
information to be passed to aircraft on ground initiative should
cover a portion of the route up to one hour’s flying time ahead
of the aircraft except when another period has been determined
on the basis of regional air navigation agreements.
9.1.3.3 TRANSMISSION OF INFORMATION
CONCERNING VOLCANIC ACTIVITY
Information concerning pre-eruption volcanic activity,
volcanic eruptions and volcanic ash clouds shall be
disseminated to aircraft by one or more of the means
9-2 Air Traffic Management (PANS-ATM)
1/11/01
specified in 9.1.3.1.1 as determined on the basis of regional
air navigation agreements.
9.1.3.4 TRANSMISSION OF INFORMATION CONCERNING
RADIOACTIVE MATERIALS AND
TOXIC CHEMICAL CLOUDS
Information on the release into the atmosphere of radioactive
materials or toxic chemicals which could affect airspace within
the area of responsibility of the ATS unit shall be transmitted
to aircraft by one or more of the means specified in 9.1.3.1.1.
9.1.3.5 TRANSMISSION OF SPECIAL REPORTS IN
THE SPECI CODE FORM AND AMENDED
AERODROME FORECASTS
9.1.3.5.1 Special reports in the SPECI code form and
amended aerodrome forecasts shall be transmitted on request
and supplemented by:
a) directed transmission from the appropriate air traffic
services unit of selected special reports and amended
aerodrome forecasts for the departure, destination and
its alternate aerodromes, as listed in the flight plan; or
b) a general call on appropriate frequencies for the
unacknowledged transmission to affected aircraft of
selected special reports and amended aerodrome
forecasts; or
c) continuous or frequent broadcast or the use of data link
to make available current aerodrome reports and
forecasts in areas determined on the basis of regional
air navigation agreements where traffic congestion
dictates. VOLMET broadcasts and/or D-VOLMET
should be used to serve this purpose (see Annex 11,
4.4).
9.1.3.5.2 The passing of amended aerodrome forecasts to
aircraft on the initiative of the appropriate air traffic services
unit should be limited to that portion of the flight where the
aircraft is within a specified time from the aerodrome of
destination, such time being established on the basis of
regional air navigation agreements.
9.1.3.6 TRANSMISSION OF INFORMATION ON HEAVY
OR MEDIUM UNMANNED FREE BALLOONS
Appropriate information on heavy or medium unmanned free
balloons shall be disseminated to aircraft by one or more of the
means specified in 9.1.3.1.1.
9.1.3.7 TRANSMISSION OF INFORMATION
TO SUPERSONIC AIRCRAFT
The following information shall be available at appropriate
ACCs or flight information centres for aerodromes determined
on the basis of regional air navigation agreements and shall be
transmitted on request to supersonic aircraft prior to
commencement of deceleration/ descent from supersonic
cruise:
a) current meteorological reports and forecasts, except
that where communications difficulties are encountered
under conditions of poor propagation, the
elements transmitted may be limited to:
i) mean surface wind, direction and speed (including
gusts);
ii) visibility or runway visual range;
iii) amount and height of base of low clouds;
iv) other significant information;
Note.— See Chapter 11, 11.4.3.2.3.8.
v) if appropriate, information regarding expected
changes;
b) operationally significant information on the status of
facilities relating to the runway in use, including the
precision approach category in the event that the
lowest approach category promulgated for the runway
is not available;
c) sufficient information on the runway surface conditions
to permit assessment of the runway braking action.
9.1.4 Air traffic advisory service
9.1.4.1 OBJECTIVE AND BASIC PRINCIPLES
9.1.4.1.1 The objective of the air traffic advisory service
　
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