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3.6.1.3 Between a unit providing approach control
service and an aerodrome control tower
3.6.1.3.1 Arriving aircraft. The responsibility for the
control of an arriving aircraft shall be transferred from the unit
providing approach control service to the aerodrome control
tower, when the aircraft:
a) is in the vicinity of the aerodrome, and:
1) it is considered that approach and landing will be
completed in visual reference to the ground, or
2) it has reached uninterrupted visual meteorological
conditions, or
b) is at a prescribed point or level, as specified in letters of
agreement or ATS unit instructions; or
c) has landed.
Note.— Even though there is an approach control unit,
control of certain flights may be transferred directly from an
area control centre to an aerodrome control tower and vice
versa, by prior arrangement between the units concerned for
the relevant part of approach control service to be provided by
the area control centre or the aerodrome control tower, as
applicable.
3.6.1.3.2 Departing aircraft. The responsibility for control
of a departing aircraft shall be transferred from the aerodrome
control tower to the unit providing approach control service:
a) when visual meteorological conditions prevail in the
vicinity of the aerodrome:
1) prior to the time the aircraft leaves the vicinity of the
aerodrome, or
2) prior to the aircraft entering instrument meteorological
conditions, or
3) at a prescribed point or level,
as specified in letters of agreement or ATS unit instructions;
b) when instrument meteorological conditions prevail at
the aerodrome:
1) immediately after the aircraft is airborne, or
2) at a prescribed point or level,
as specified in letters of agreement or ATS unit instructions.
Note.— See Note following 3.6.1.3.1.
3.6.1.4 Between control sectors/positions within the same
air traffic control unit
The responsibility for control of an aircraft shall be transferred
from one control sector/position to another control sector/
position within the same air traffic control unit at a point, level
or time, as specified in ATS unit instructions.
3.6.2 Coordination of transfer
3.6.2.1 Responsibility for control of an aircraft shall not
be transferred from one air traffic control unit to another
without the consent of the accepting control unit, which shall
be obtained in accordance with 3.6.2.2, 3.6.2.2.1, 3.6.2.2.2 and
3.6.2.3.
3.6.2.2 The transferring control unit shall communicate to
the accepting control unit the appropriate parts of the current
flight plan and any control information pertinent to the transfer
requested.
3.6.2.2.1 Where transfer of control is to be effected using
radar data, the control information pertinent to the transfer
shall include information regarding the position and, if
required, the track and speed of the aircraft, as observed by
radar immediately prior to the transfer.
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
　
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