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centre by an area control or flight information centre shall,
whenever practicable, also be communicated, without delay, to
the operator.
5.6 Information to aircraft operating in
the vicinity of an aircraft in
a state of emergency
5.6.1 When it has been established by an air traffic
services unit that an aircraft is in a state of emergency, other
aircraft known to be in the vicinity of the aircraft involved
shall, except as provided in 5.6.2, be informed of the nature of
the emergency as soon as practicable.
5.6.2 When an air traffic services unit knows or believes
that an aircraft is being subjected to unlawful interference, no
reference shall be made in ATS air-ground communications to
the nature of the emergency unless it has first been referred to
in communications from the aircraft involved and it is certain
that such reference will not aggravate the situation.
ANNEX 11 6-1 1/11/01
CHAPTER 6. AIR TRAFFIC SERVICES REQUIREMENTS
FOR COMMUNICATIONS
6.1 Aeronautical mobile service
(air-ground communications)
6.1.1 General
6.1.1.1 Radiotelephony and/or data link shall be used in
air-ground communications for air traffic services purposes.
Note.— Requirements for ATS units to be provided with
and to maintain guard on the emergency channel 121.5 MHz
are specified in Annex 10, Volumes II and V.
6.1.1.2 When direct pilot-controller two-way radiotelephony
or data link communications are used for the provision of
air traffic control service, recording facilities shall be provided
on all such air-ground communication channels.
6.1.2 For flight information service
6.1.2.1 Air-ground communication facilities shall enable
two-way communications to take place between a unit providing
flight information service and appropriately equipped
aircraft flying anywhere within the flight information region.
6.1.2.2 Recommendation.— Whenever practicable, airground
communication facilities for flight information service
should permit direct, rapid, continuous and static-free two-way
communications.
6.1.3 For area control service
6.1.3.1 Air-ground communication facilities shall enable
two-way communications to take place between a unit providing
area control service and appropriately equipped aircraft
flying anywhere within the control area(s).
6.1.3.2 Recommendation.— Whenever practicable, airground
communication facilities for area control service
should permit direct, rapid, continuous and static-free two-way
communications.
6.1.3.3 Recommendation.— Where air-ground voice
communication channels are used for area control service and
are worked by air-ground communicators, suitable arrangements
should be made to permit direct pilot-controller voice
communications, as and when required.
6.1.4 For approach control service
6.1.4.1 Air-ground communication facilities shall enable
direct, rapid, continuous and static-free two-way communications
to take place between the unit providing approach
control service and appropriately equipped aircraft under its
control.
6.1.4.2 Where the unit providing approach control service
functions as a separate unit, air-ground communications shall
be conducted over communication channels provided for its
exclusive use.
6.1.5 For aerodrome control service
6.1.5.1 Air-ground communication facilities shall enable
direct, rapid, continuous and static-free two-way communications
to take place between an aerodrome control tower and
appropriately equipped aircraft operating at any distance within
45 km (25 NM) of the aerodrome concerned.
6.1.5.2 Recommendation.— Where conditions warrant,
separate communication channels should be provided for the
control of traffic operating on the manoeuvring area.
6.2 Aeronautical fixed service
(ground-ground communications)
6.2.1 General
6.2.1.1 Direct-speech and/or data link communications
shall be used in ground-ground communications for air traffic
services purposes.
Note.— Indication by time of the speed with which the
communication should be established is provided as a guide to
communication services, particularly to determine the types of
communication channels required, e.g. that “instantaneous” is
intended to refer to communications which effectively provide
for immediate access between controllers; “fifteen seconds” to
accept switchboard operation and “five minutes” to mean
methods involving retransmission.
Annex 11 — Air Traffic Services Chapter 6
1/11/01 6-2
6.2.2 Communications within a
　
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