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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:
Chapter 3 Annex 11 — Air Traffic Services
3-5 1/11/01
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
authority, aircraft shall contact a downstream air traffic control
unit, for the purpose of receiving a downstream clearance prior
to the transfer of control point.
3.7.4.2.1.1 Aircraft shall maintain the necessary two-way
communication with the current air traffic control unit whilst
obtaining a downstream clearance.
3.7.4.2.1.2 A clearance issued as a downstream clearance
shall be clearly identifiable as such to the pilot.
3.7.4.2.1.3 Unless coordinated, downstream clearances
shall not affect the aircraft’s original flight profile in any 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 II. 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 apply 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 (ATFM) 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 services
concerned will normally be declared by the appropriate ATS
authority.
3.7.5.2 Recommendation.— ATFM should be implemented
on the basis of regional air navigation agreements or, if appropriate,
through multilateral agreements. Such agreements
should make provision for common procedures and common
methods of capacity determination.
3.7.5.3 When it becomes apparent to an ATC unit that
traffic additional to that already accepted cannot be accommodated
within a given period of time at a particular location or
in a particular area, or can only be accommodated at a given
rate, that unit shall so advise the ATFM unit, when such is
established, as well as, when appropriate, ATS units concerned.
Flight crews of aircraft destined to the location or area in
question and operators concerned shall also be advised of the
delays expected or the restrictions that will be applied.
Note.— Operators concerned will normally be advised, in
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