b) expected type of instrument approach procedure;
c) average time interval between successive approaches as determined by the unit providing approach control service;
d) revision of the expected approach time issued by the area control centre when the calculation of the expected approach time by the unit providing approach control service indicates a variation of five minutes or such other time as has been agreed between the two ATC units concerned;
e) arrival times over the holding point when these vary by three minutes, or such other time as has been agreed between the two ATC units concerned, from those previously estimated;
f) cancellations by aircraft of their IFR flights, if these will affect levels at the holding point or expected approach times of other aircraft;
g) departure times of departing aircraft;
h) all available information relating to overdue or unreported aircraft;
i) missed approaches.
4.3.2.2 From the area control centre to the unit providing approach control service. The area control centre shall keep the unit providing approach control service promptly advised of pertinent data on controlled traffic such as:
a) identification, type and point of departure of arriving aircraft;
b) estimated time and proposed level of arriving aircraft over holding point or actual time if aircraft is released to the unit providing approach control service after arrival over the holding point;
c) requested type of instrument approach procedure if different to that specified in 4.3.2.1 b);
d) expected approach time issued;
e) statement that aircraft has been cleared to contact the unit providing approach control service;
f) statement that an aircraft has been released to the unit providing approach control service including, if necessary, the time and conditions of release;
g) anticipated delay to departing traffic due to conges-tion.
6/11/97
No. 1
Rules of the Air and Air Traffic Services (PANS-RAC)
4.3.2.2.1 Information on arriving aircraft shall be forwarded not less than fifteen minutes before estimated time of arrival and such information shall be revised as necessary.
4.4 Co-ordination between a unit
providing approach control service and a unit
providing aerodrome control service
4.4.1 Division of control
4.4.1.1 A unit providing approach control service shall retain control of arriving aircraft until such aircraft have been cleared to the aerodrome control tower and are in communication with the aerodrome control tower. Not more than one arrival shall be cleared to a unit providing aerodrome control service during IMC, except when prior arrangements have been made by the appropriate ATS authority.
4.4.1.2 After co-ordination with the aerodrome control tower, the unit providing approach control service may clear arriving aircraft to visual holding points to hold until further advised by the aerodrome control tower.
4.4.1.3 A unit providing approach control service may authorize an aerodrome control tower to release an aircraft for take-off subject to the discretion of the aerodrome control tower with respect to arriving aircraft.
4.4.1.4 Aerodrome control towers shall obtain approval from the unit providing approach control service prior to authorizing operation of special VFR flights.
4.4.2 Exchange of movement and control data
4.4.2.1 From an aerodrome control tower to the unit providing approach control service. 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) 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;
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