7.5.3 The minimum agreed separation between aircraft about to be transferred (7.5.2 d) refers) and the advance notice
(7.5.2 e) refers) shall be determined taking into account all relevant technical, operational and other circumstances. If circumstances arise in which these agreed conditions can no longer be satisfied, controllers shall revert to the procedure in
7.5.4 until the situation is resolved.
7.5.4 Where primary radar is being used, and where SSR is employed but the provisions of 7.5.2 are not applied, the transfer of radar control of aircraft between adjacent control positions or between two adjacent ATS units may be effected, provided that:
a) radar identification has been transferred to or has been established directly by the accepting radar controller;
b) when the radar controllers are not physically adjacent, two-way direct-speech facilities between them are at all times available which permit communications to be established instantaneously;
VI. Radar Services
Figure VI-1A (See 7.4.4 and 7.4.4.1)
Figure VI-1B (See 7.4.4 and 7.4.4.1)
c) radar separation from other radar-controlled flights conforms to the minima authorized for use during transfer of radar control between the radar sectors or units concerned;
d) the accepting radar controller is informed of any level, speed or vectoring instructions applicable to the aircraft at the point of transfer;
e) radiocommunication with the aircraft is retained by the transferring radar controller until the accepting radar controller has agreed to assume responsibility for providing radar service to the aircraft. Thereafter, the aircraft should be instructed to change over to the appropriate frequency and from that point is the responsibility of the accepting radar controller.
7.6 Speed control
7.6.1 Subject to conditions specified by the appropriate ATS authority, including consideration of aircraft performance limitations, a radar controller may, in order to facilitate radar control or to reduce the need for radar vectoring, request aircraft under radar control to adjust their speed in a specified manner. Aircraft may be requested to maintain maximum speed, minimum speed, minimum clean speed (signifying that drag-inducing devices are not deployed), minimum approach speed or a specific speed. Specific speeds should normally be expressed in multiples of 20 km/h (10 kt) based on indicated airspeed (IAS), or in multiples of 0.01 Mach when using the Mach number technique.
7.6.2 Only minor speed adjustments, of not more than ±40 km/h (±20 kt), should be requested of an aircraft established on intermediate and final approach. Speed control should not be applied after a point 8 km (4 NM) from the threshold on final approach.
7.6.3 Aircraft concerned should be advised as soon as speed control is no longer necessary.
8. Emergencies, hazards and equipment failures
8.1 Emergencies
8.1.1 In the event of an aircraft in, or appearing to be in, any form of emergency, every assistance shall be provided by the radar controller and the procedures prescribed herein may be varied according to the situation.
8.1.2 The progress of an identified aircraft in emerg-ency shall be monitored and (whenever possible) plotted on the radar display until the aircraft passes out of radar coverage, and position information shall be provided to all air traffic services units which may be able to give assistance to the aircraft. Radar transfer to adjacent radar sectors shall also be effected when appropriate.
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