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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
advance where possible, of restrictions imposed by the air
traffic flow management unit when such is established.
3.8 Control of persons and
vehicles at aerodromes
3.8.1 The movement of persons or vehicles including
towed aircraft on the manoeuvring area of an aerodrome shall
be controlled by the aerodrome control tower as necessary to
avoid hazard to them or to aircraft landing, taxiing or taking
off.
3.8.2 In conditions where low visibility procedures are in
operation:
a) persons and vehicles operating on the manoeuvring area
of an aerodrome shall be restricted to the essential
minimum, and particular regard shall be given to the
requirements to protect the ILS/MLS sensitive area(s)
when Category II or Category III precision instrument
operations are in progress;
Annex 11 — Air Traffic Services Chapter 3
1/11/01 3-6
b) subject to the provisions in 3.8.3, the minimum separation
between vehicles and taxiing aircraft shall be as
prescribed by the appropriate ATS authority taking into
account the aids available;
c) when mixed ILS and MLS Category II or Category III
precision instrument operations are taking place to the
same runway continuously, the more restrictive ILS or
MLS critical and sensitive areas shall be protected.
Note.— The period of application of low visibility
procedures is determined in accordance with ATS unit instructions.
Guidance on low visibility operations on an aerodrome
is contained in the Manual of Surface Movement Guidance
and Control Systems (SMGCS) (Doc 9476).
3.8.3 Emergency vehicles proceeding to the assistance of
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