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accordance with 5.2.1.
5.5.2 All information notified to the rescue coordinathh
centre by an axa control or flight information centre sh#,
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 traffi
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.
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 11 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
comnzunicatiotl facilities forflight information service
should permit direct, rapid, continuous and staticlfree two-wuy
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 appropriate!y equipped aircraft
flying anywhere within the control area(s).
6. I .3.2 Recommendation.- Whenever practicable, airground
comm~~nicatiofna cilities for area control service
should permit direct, rapid, continuous and static free two way
conzmunicarions.
6.1.3.3 Recommendation.- Where air-ground voice
conzmunication channek are used for area control service and
are worked bj air-ground comnzunicators, suitable arrangenzents
should be made to permit direct pilot-controller voice
corr~rr~rlnicatiott~rs , und 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 sho~lld he provided for the
control of traffic operating on the rnunoe~rvring 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.
N o t e . Indication by rime of the speed with which the
communication should he established is provided as a guide to
communication services, particularly to determine the types of
communication chunnels required, e.g that "instantaneous" is
intended to refer to comnulnications which effectively provide
for immediate access between c~ontrollers;' sfteen seconds" to
accept switchboard operation and "five minlrtes" to mean
merhod.s irlvol~~itr~etgr atls~ni~sio~z.
ANNEX 1 I 6-1
Annex 11 - Air Traffic Services
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