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is to make information on collision hazards more effective
than it would be in the mere provision of flight information
service. It may be provided to aircraft conducting IFR flights
in advisory airspace or on advisory routes (Class F airspace).
Such areas or routes will be specified by the State concerned.
9.1.4.1.2 Taking into account the consideration detailed
in 2.4 of Annex 11, air traffic advisory service should only
be implemented where the air traffic services are inadequate
Chapter 9. Flight Information Service and Alerting Service 9-3
1/11/01
for the provision of air traffic control, and the limited advice
on collision hazards otherwise provided by flight information
service will not meet the requirement. Where air traffic
advisory service is implemented, this should be considered
normally as a temporary measure only until such time as it
can be replaced by air traffic control service.
9.1.4.1.3 Air traffic advisory service does not afford the
degree of safety and cannot assume the same responsibilities
as air traffic control service in respect of the avoidance of
collisions, since information regarding the disposition of
traffic in the area concerned available to the unit providing air
traffic advisory service may be incomplete. To make this quite
clear, air traffic advisory service does not deliver “clearances”
but only “advisory information” and it uses the word “advise”
or “suggest” when a course of action is proposed to an aircraft.
Note.— See 9.1.4.2.2.
9.1.4.2 AIRCRAFT
9.1.4.2.1 AIRCRAFT USING THE AIR TRAFFIC ADVISORY SERVICE
IFR flights electing to use or required by the appropriate ATS
authority on the basis of regional air navigation agreements to
use the air traffic advisory service when operating within
Class F airspace are expected to comply with the same
procedures as those applying to controlled flights except that:
a) the flight plan and changes thereto are not subjected to
a clearance, since the unit furnishing air traffic
advisory service will only provide advice on the
presence of essential traffic or suggestions as to a
possible course of action;
Note 1.— It is assumed that a pilot will not effect
a change in the current flight plan until he or she has
notified the intended change to the appropriate ATS
unit, and, if practicable, has received acknowledgement
or relevant advice.
Note 2.— When a flight is operating or about to
operate in a control area to continue eventually into
an advisory area or along an advisory route, a
clearance may be issued for the whole route, but the
clearance as such, or revisions thereto, applies only to
those portions of the flight conducted within control
areas and control zones (3.7.4.4 of Annex 11). Advice
or suggestions would be provided as necessary for the
remaining portion of the route.
b) it is for the aircraft to decide whether or not it will
comply with the advice or suggestion received and to
inform the unit providing air traffic advisory service,
without delay, of its decision;
c) air-ground contacts shall be made with the air traffic
services unit designated to provide air traffic advisory
service within the advisory airspace or portion thereof.
Note.— See Chapter 4, 4.4.2, for procedures governing
submission of a flight plan.
9.1.4.2.2 AIRCRAFT NOT USING THE AIR TRAFFIC
9.1.4.2.2 ADVISORY SERVICE
9.1.4.2.2.1 Aircraft wishing to conduct IFR flights within
advisory airspace, but not electing to use the air traffic
advisory service, shall nevertheless submit a flight plan, and
notify changes made thereto to the unit providing that service.
Note.— See Chapter 4, 4.4.2, for procedures governing
submission of a flight plan.
9.1.4.2.2.2 IFR flights intending to cross an advisory
route should do so as nearly as possible at an angle of 90
degrees to the direction of the route and at a level, appropriate
to its track, selected from the tables of cruising levels
prescribed for use by IFR flights operating outside controlled
airspace.
9.1.4.3 AIR TRAFFIC SERVICES UNITS
Note.— The efficiency of air traffic advisory service will
depend largely on the procedures and practices in use. Its
establishment in line with the organization, procedures and
equipment of area control service, taking into account the
basic differences of the two services, as indicated in
9.1.4.2.1.1, will help to ensure a high degree of efficiency and
promote uniformity in the various provisions of air traffic
advisory service. For example, exchange of information by the
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