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agreement or ATS unit instructions; or the accepting control unit the appropriate parts of the current
flight plan and any control information pertinent to the transfer
C) has landed. requested.
Chapter 3 Annex I1 - Air Tr* Services
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 11, and PANS-ATM, Chapter 14.
3.7.4 Coordination of clearances
An air traffic control clearance shall be coordinated between
air traffic control units to cover the entire route of an aircraft
or a specified portion thereof as follows.
3.7.4.1 An aircraft shall be cleared for the entire route to
the aerodrome of first intended landing:
a) when it has been possible, prior to departure, to
coordinate the clearance between all the units under
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
traffic, the succeeding en-route clearance will be as specified
above even though the aerodrome of first intended landing is
under the jurisdiction of an area control centre other than the
one issuing the en-route clearance.
3.7.4.2 When coordination as in 3.7.4.1 has not been
achieved or is not anticipated, the aircraft shall be cleared only
to that point where coordination is reasonably assured; prior to
reaching such point, or at such point, the aircraft shall receive
further clearance, holding instructions being issued as
appropriate.
3.7.4.2.1 When prescribed by the appropriate ATS
airspace, other than that of the air traffic control unit
responsible for the delivery of the downstream clearance.
Note.- Requirements relating to the application of
downstream clearance delivery service are specified in
Annex 10. Volume 1I. Guidance material is contained in the
Manual of Air Traffic Services Data Link Applications
(Doc 9694).
3.7.4.2.1.4 Recommendation.- Where practicable, and
where data link communications are used to facilitate downstream
clearance delivery, two-way voice communications
between the pilot and the air traffic control unit providing the
downstream clearance should be available.
3.7.4.3 When an aircraft intends to depart from an
aerodrome within a control area to enter another control area
within a period of thirty minutes, or such other specific period
of time as has been agreed between the area control centres
concerned, coordination with the subsequent area control centre
shall be effected prior to issuance of the departure clearance.
3.7.4.4 When an aircraft intends to leave a control area for
flight outside controlled airspace, and will subsequently re-enter
the same or another control area, a clearance from point of
departure to the aerodrome of first intended landing may be
issued. Such clearance or revisions thereto shall appiy only to
those portions of the flight conducted within controlled airspace.
3.7.5 Air traffic flow management
3.7.5.1 Air traffic flow management ( A m shall be
implemented for airspace where air traffic demand at times
exceeds, or is expected to exceed, the declared capacity of the
air traffic control services concerned.
Note.- The capacity of the air traffic control sewices
concerned will normally be declared by the appropriate ATS
authority.
3.7.5.2 Recommendation.- ATFM should be inrplemetzted
on the basis of regional air navigation agreements or, ifappropriate,
through multilateral agreements. Such agreements
should make provision for common procedures and common
methods of capacity determination.
authority, aircraft shall contact a downstream air tramc control
unit, for the purpose of receiving a downstream clearance prior 3.7.5.3 When it becomes apparent to an ATC unit that
to the transfer of control point. traffic additional to that already accepted cannot be accommodated
within a given period of time at a particular location or
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