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boundary of that control area, even when control of one or
more aircraft is exercised under delegation by other air traffic
control units (see Annex 11, 3.5.2). The accepting unit which
is in communication with an aircraft not yet having reached
the incoming transfer of control point shall not alter the
clearance of such aircraft without the prior approval of the
transferring unit.
Note.— When so agreed between the ATC units concerned,
the transfer of control point may be a point other than the
control area boundary.
10.4.2.3.3 Where specified in letters of agreement
between the ATC units concerned, the transferring unit shall
notify the accepting unit that the aircraft is in position to be
transferred, and that the responsibility for control should be
assumed by the accepting unit, either forthwith or, if a
specified transfer of control point has been established, at the
time when the aircraft passes that point. When an SSR Mode
and Code is assigned to the aircraft or is otherwise known, and
the accepting unit is able to make use of these data, they shall
be included in such notification.
10.4.2.3.4 In the event that transfer of control will be
effected prior to the aircraft passing a designated transfer of
control point, the transferring ATC unit shall notify the
accepting unit accordingly. Any release restrictions that apply
shall be specified by the transferring ATC unit.
10.4.2.3.5 When transfer of radar control is to be
effected, the appropriate procedures specified in Chapter 8,
Section 8.7.5, shall be applied.
10.4.2.4 TRANSFER OF COMMUNICATION
10.4.2.4.1 Where non-radar separation minima are being
applied, the transfer of air-ground communications of an
aircraft from the transferring to the accepting ATC unit shall
be made five minutes before the time at which the aircraft is
estimated to reach the common control area boundary, unless
otherwise agreed between the two ATC units concerned.
10.4.2.4.2 When radar or ADS separation minima are
being applied at the time of transfer of control, the transfer of
air-ground voice and/or data communications of an aircraft
from the transferring to the accepting ATC unit shall be made
immediately after the accepting ATC unit has agreed to
assume control.
10.4.2.4.3 A notification from the transferring ATC unit
that the aircraft will be instructed or has already been
instructed to establish radio and/or data communications with
the accepting unit is required in those cases where this has
been agreed between the two ATC units concerned.
10.4.2.4.4 The accepting ATC unit shall normally not be
required to notify the transferring unit that radio and/or data
communication has been established with the aircraft being
transferred and that control of the aircraft has been assumed,
unless otherwise specified by agreement between the ATC
units concerned. The accepting ATC unit shall notify the
transferring unit in the event that communication with the
aircraft is not established as expected.
10.4.2.4.5 In cases where a portion of a control area is so
situated that the time taken by aircraft to traverse it is of a
limited duration, agreement should be reached to provide for
direct transfer of communication between the units responsible
for the adjacent control areas, provided that the intermediate
unit is fully informed of such traffic. The intermediate unit
shall retain responsibility for coordination and for ensuring
that separation is maintained between all traffic within its area
of responsibility.
10.4.2.5 TERMINATION OF CONTROLLED FLIGHT
In the case where a flight ceases to be operated as a controlled
flight, i.e. by leaving controlled airspace or by cancelling its
IFR flight and proceeding on VFR in airspace where VFR
flights are not controlled, the ATC unit concerned shall ensure
that appropriate information on the flight is forwarded to ATS
unit(s) responsible for the provision of flight information and
alerting services for the remaining portion of the flight, in
order to ensure that such services will be provided to the
aircraft.
10.4.3 Coordination between a unit
providing area control service and a unit
providing approach control service
10.4.3.1 DIVISION OF CONTROL
10.4.3.1.1 Except when otherwise specified in letters of
agreement or local instructions, or by the ACC concerned in
10-4 Air Traffic Management (PANS-ATM)
1/11/01
individual cases, a unit providing approach control service
may issue clearances to any aircraft released to it by an ACC
without reference to the ACC. However, when an approach has
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