Rules of the Air and Air Traffic Services(79)

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iv) the aerodrome controller is able to observe, visually or by means of surface movement radar (SMR) or a surface movement guidance and control system (SMCGS), the runway-in-use and associated exit and entry taxiways;
v)  wake turbulence radar separation minima in 7.4.4 below, or as may be prescribed by the appropriate ATS authority (e.g. for specific aircraft types), do not apply;
vi)  aircraft approach speeds are closely monitored by the controller and when necessary adjusted so as to ensure that separation is not reduced below the minimum;
vii)  aircraft operators and pilots have been made fully aware of the need to exit the runway in an expeditious manner whenever the reduced separation minimum on final approach is applied; and
viii)  procedures concerning the application of the reduced minimum are published in Aeronautical Information Publications.

7.4.3 The radar separation minimum or minima to be applied shall be prescribed by the appropriate ATS authority according to the capability of the particular radar system or sensor to accurately identify the aircraft position in relation to the centre of an RPS, PSR blip or SSR response and taking into account factors which may affect the accuracy of the radar-derived information, such as aircraft range from the radar site.
7.4.4 The following wake turbulence radar separation minima shall be applied to aircraft in the approach and depar-ture phases of flight in the circumstances given in 7.4.4.1.
Aircraft category Preceding aircraft Succeeding aircraft  Wake turbulence radar separation minima 
HEAVY  HEAVY MEDIUM LIGHT  7.4 km (4.0 NM) 9.3 km (5.0 NM) 11.1 km (6.0 NM) 
MEDIUM  LIGHT  9.3 km (5.0 NM) 

Note.— The provisions governing wake turbulence aircraft categorization are set forth in Part V, Section 16.
7.4.4.1 The minima set out in 7.4.4 shall be applied when:
a)  an aircraft is operating directly behind another aircraft at the same altitude or less than 300 m (1 000 ft) below; or
b)  both aircraft are using the same runway, or parallel runways separated by less than 760 m; or
c)  an aircraft is crossing behind another aircraft, at the same altitude or less than 300 m (1 000 ft) below.
Note.— See Figures VI-1A and VI-1B.
7.5 Transfer of radar control

7.5.1 Transfer of radar control should be effected whenever practicable so as to enable the uninterrupted provision of radar service.
7.5.2 Where SSR is used and the radar system provides for the display of radar position indications with associated radar labels, transfer of radar control of aircraft between adjacent control positions or between adjacent ATC units may be effected without prior co-ordination, provided that:
a)  updated flight plan information on the aircraft about to be transferred, including the discrete assigned SSR Code, is provided to the accepting controller prior to transfer;
b)  radar coverage provided to the accepting controller is such that the aircraft concerned is presented on the radar display before the transfer is effected and is identified on, but preferably before, receipt of the initial call;
Rules of the Air and Air Traffic Services (PANS-RAC)
c)  when the controllers are not physically adjacent, two-way direct speech facilities, which permit communica-tions to be established instantaneously, are available between them at all times;
Note.— “Instantaneous” refers to communications which effectively provide for immediate access between controllers.
d)  the transfer point or points and all other conditions of application, such as direction of flight, specified levels, transfer of communication points, and especially an agreed minimum separation between aircraft, including that applicable to succeeding aircraft on the same route, about to be transferred as observed on the display, have been made the subject of specific instructions (for intra-unit transfer) or of a specific letter of agreement between two adjacent ATC units;
　
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