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3.6.2.2.2 Where transfer of control is to be effected using
ADS data, the control information pertinent to the transfer shall
include the four-dimensional position and other information as
necessary.
3.6.2.3 The accepting control unit shall:
a) indicate its ability to accept control of the aircraft on the
terms specified by the transferring control unit, unless
by prior agreement between the two units concerned, the
absence of any such indication is understood to signify
acceptance of the terms specified, or indicate any
necessary changes thereto; and
b) specify any other information or clearance for a
subsequent portion of the flight, which it requires the
aircraft to have at the time of transfer.
Annex 11 — Air Traffic Services Chapter 3
1/11/01 3-4
3.6.2.4 The accepting control unit shall notify the
transferring control unit when it has established two-way voice
and/or data link communications with and assumed control
of the aircraft concerned, unless otherwise specified by agreement
between the two control units concerned.
3.6.2.5 Applicable coordination procedures, including
transfer of control points, shall be specified in letters of
agreement and ATS unit instructions as appropriate.
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 traffic
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:
a) the safe, orderly and expeditious flow of air traffic;
b) the description of the route and procedure in air traffic
control clearances.
Note.— Material relating to the establishment of standard
departure and arrival routes and associated procedures is
contained in the Air Traffic Services Planning Manual
(Doc 9426). The design criteria are contained in PANS-OPS,
Volume II (Doc 8168).
3.7.2 Clearances for transonic flight
3.7.2.1 The air traffic control clearance relating to the
transonic acceleration phase of a supersonic flight shall extend
at least to the end of that phase.
3.7.2.2 Recommendation.— The air traffic control
clearance relating to the deceleration and descent of an
aircraft from supersonic cruise to subsonic flight should
provide for uninterrupted descent, at least during the transonic
phase.
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 ATC clearances and instructions
which are transmitted by voice. The following items shall
always be read back:
a) ATC 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 II and PANS-ATM, Chapter 14.
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