VIII. Co-ordination
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.
4.4.2.2 From the unit providing approach control service to an aerodrome control tower. 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) statement that an aircraft has been cleared to contact the aerodrome control tower and that control shall be assumed by that unit;
c) anticipated delay to departing traffic due to congestion.
4.5 Co-ordination between control positions within the same unit
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.
5. Co-ordination between
air traffic services units and
aeronautical telecommunication stations
5.1 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.
PART IX. AIR TRAFFIC SERVICES MESSAGES
1. Categories of messages
1.1 The messages listed below are authorized for transmission via the aeronautical fixed service (including the aeronautical fixed telecommunication network (AFTN), direct-speech circuits or digital data interchange between air traffic services units, and direct teletypewriter and computer-computer 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.
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.
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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