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approval from the unit providing approach control service
prior to authorizing operation of special VFR flights.
10.4.4.2 EXCHANGE OF MOVEMENT AND
CONTROL DATA
10.4.4.2.1 An aerodrome control tower shall keep the
unit providing approach control service promptly advised of
pertinent data on relevant controlled traffic such as:
a) arrival and departure times;
b) when required, statement that the first aircraft in an
approach sequence is in communication with and is
sighted by the aerodrome control tower, and that
reasonable assurance exists that a landing can be
accomplished;
c) all available information relating to overdue or
unreported aircraft;
d) information concerning missed approaches;
e) information concerning aircraft that constitute essential
local traffic to aircraft under the control of the unit
providing approach control service.
10.4.4.2.2 The unit providing approach control service
shall keep the aerodrome control tower promptly advised of
pertinent data on controlled traffic such as:
a) estimated time and proposed level of arriving aircraft
over the aerodrome, at least fifteen minutes prior to
estimated arrival;
b) when required, a statement that an aircraft has been
instructed to contact the aerodrome control tower and
that control shall be assumed by that unit;
c) anticipated delay to departing traffic due to congestion.
10.4.5 Coordination between control positions
within the same unit
10.4.5.1 Appropriate flight plan and control information
shall be exchanged between control positions within the same
air traffic control unit, in respect of:
a) all aircraft for which responsibility for control will be
transferred from one control position to another;
b) aircraft operating in such close proximity to the
boundary between control sectors that control of traffic
within an adjacent sector may be affected;
c) all aircraft for which responsibility for control has been
delegated by a procedural controller to a radar
controller, as well as other aircraft affected.
10.4.5.2 Procedures for coordination and transfer of
control between control sectors within the same ATC unit shall
conform to the procedures applicable to ATC units.
10.5 COORDINATION BETWEEN AIR TRAFFIC
SERVICES UNITS AND AERONAUTICAL
TELECOMMUNICATION STATIONS
When so prescribed by the appropriate ATS authority, air
traffic services units shall ensure that the aeronautical
telecommunications stations serving the centres concerned are
informed regarding transfers of communications contact by
aircraft. Unless otherwise provided, information to be made
available shall comprise the identification of the aircraft
(including SELCAL code, when necessary), the route or
destination (where necessary), and the expected or actual time
of communications transfer.
PANS-ATM 11-1 1/11/01
CHAPTER 11. AIR TRAFFIC SERVICES MESSAGES
11.1 CATEGORIES OF MESSAGES
11.1.1 The messages listed below are authorized for
transmission via the aeronautical fixed service (including the
aeronautical fixed telecommunication network (AFTN), directspeech
circuits or digital data interchange between air traffic
services units, and direct teletypewriter and computercomputer
circuits), or via the aeronautical mobile service, as
applicable. They are classified in categories relating to their
use by the air traffic services and providing an approximate
indication of their importance.
Note.— The Priority Indicator in parentheses after each
type of message is that specified in Annex 10 (Vol. II,
Chapter 4) for application when the message is transmitted
on the AFTN.
11.1.2 Emergency messages
This category comprises:
a) distress messages and distress traffic, including
alerting messages relating to a distress phase (SS);
b) urgency messages, including alerting messages relating
to an alert phase or to an uncertainty phase (SS);
c) other messages concerning known or suspected
emergencies which do not fall under a) or b) above,
and radiocommunication failure messages (FF or
higher as required).
Note.— When the messages in a) and b) and, if required,
in c) above are filed with the public telecommunication
service, the Priority Indicator SVH, assigned to telegrams
relating to the safety of life, is to be used in accordance with
Article 25 of the International Telecommunication Convention,
Malaga, 1973.
11.1.3 Movement and control messages
This category comprises:
a) filed flight plan messages and associated update
messages (FF), including:
— filed flight plan messages
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