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aircraft to have at the time of transfer.
Annex 11 - Air Traffic Services Chapter 3
3.6.2.4 The accepting control unit shall notify the 3.7.2 Clearances for transonic flight
transferring control unit when it has established two-way voice
andlor data link communications with and assumed control 3.7.2.1 The air traffic control clearance relating to the
of the aircraft concerned, unless otherwise specified by agree- transonic acceleration phase of a supersonic flight shall extend
ment between the two control units concerned. at least to the end of that phase.
3.6.2.5 Applicable coordination procedures, including 3.7.2.2 Recommendation.- The air trafic control
transfer of control points, shall be specified in letters of clearance to the deceleration and descent of an
agreement and ATS unit instructions as appropriate. aircraft from supersonic cruise to subsonic flight should
provide for uninterrupted descent, at least during the transonic
phase.
3.7 Air traffic control clearances
Air traffic control clearances shall be based solely on the
requirements for providing air traffic control service.
3.7.1 Contents of clearances
3.7.1.1 An air traffic control clearance shall indicate:
a) aircraft identification as shown in the flight plan;
b) clearance limit;
c) route of flight;
d) level(s) of flight for the entire route or part thereof and
changes of levels if required;
Note.-- If the clearance for the levels covers only
part of the route, it is important for the air trafJic
control unit to specify a point to which the part of the
clearance regarding levels applies whenever necessary
to ensure compliance with 3.6.5.2.2 a) of Annex 2.
e) any necessary instructions or information on other
matters such as approach or departure manoeuvres,
communications and the time of expiry of the clearance.
Note.- The time of expiry of the clearance indicates
the time after which the clearance will be automatically
cancelled if the flight has not been commenced.
3.7.1.2 Recommendation.- Standard departure and
arrival routes and associated procedures should be established
when necessary to facilitate:
3.7.3 Read-back of clearances and
safety-related information
3.7.3.1 The flight crew shall read back to the air traffic
controller safety-related parts of M C clearances and instructions
which are transmitted by voice. The following items shall
always be read back:
a) H C route clearances;
b) clearances and instructions to enter, land on, take off on,
hold short of, cross and backtrack on any runway; and
c) runway-in-use, altimeter settings, SSR codes, level
instructions, heading and speed instructions and, whether
issued by the controller or contained in ATIS broadcasts,
transition levels.
3.7.3.1.1 Other clearances or instructions, including
conditional clearances, shall be read back or acknowledged in
a manner to clearly indicate that they have been understood
and will be complied with.
3.7.3.1.2 The controller shall listen to the read-back to
ascertain that the clearance or instruction has been correctly
acknowledged by the flight crew and shall take immediate
action to correct any discrepancies revealed by the read-back.
3.7.3.2 Unless specified by the appropriate ATS authority,
voice read-back of CPDLC messages shall not be required.
Note.- The procedures and provisions relating to the
exchange and acknowledgement of CPDLC messages are
contained in Annex 10, Volume I1 and PANS-ATM, Chapter 14.
a) t h s~&, orderly and expeciitio~~sfloowf air trafic;
b) the description of the route and procedure in air trafic 3.7.4 Coordination of clearances
control clearances.
An air traffic control clearance shall be coordinated between
Note.- Material relating to the establishment of standard air traffic control units to Cover the entire route of an aircraft
departure and arrival routes and associated procedures is 0' a specified portion thereof as follows.
contained in the Air Traffic Services Planning Manual
(Doc 9426). The design criteria are contained in PANS-UPS, 3.7.4.1 An aircraft shall be cleared for the entire route to
Volume II (Doc 8168). the aerodrome of first intended landing:
Chapter 3 Annex 11 - Air Traffic Servtees
a) when it has been possible, prior to departure, to
coordinate the clearance between all the units undcr
whose control the aircraft will come: or
b) when there is reasonable assurance that prior coordination
will be effected between those units under whose
control the aircraft will subsequently come.
Note.- Where a clearance is issued covering the initial
part of the flight solely as a means of expediting departing
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