9.7.2.7.1 A precision radar approach is terminated when the aircraft reaches the point at which the glide path intercepts the obstacle clearance altitude/height. Nevertheless, information shall continue to be given until the aircraft is over the threshold, or at such distance therefrom as may be specified by the appropriate ATS authority, taking into account the capability of the equipment concerned. The approach may be monitored to touchdown and information may continue to be provided as necessary at the discretion of the radar controller in charge of the precision approach in which case the aircraft shall be informed when it is over the threshold.
9.7.2.8 Missed approaches
9.7.2.8.1 When information provided by the elevation element indicates that the aircraft may be initiating a missed approach, the radar controller shall take the following action:
VI. Radar Services
a) when there is sufficient time to obtain a reply from the pilot (e.g. when the aircraft is more than 4 km (2 NM) from touchdown), the radar controller shall transmit the aircraft’s height above the glide path and ask if the pilot intends to make a missed approach. If this is confirmed by the pilot, the radar controller shall pass missed approach instructions (see 9.6.1.8);
b) when there is not sufficient time to obtain a reply from the pilot (e.g. when the aircraft is at 4 km (2 NM) or less from touchdown) the precision approach should be continued, emphasizing the aircraft’s displacement, and terminated at the normal termination point. If it is apparent from elevation information that the aircraft is making a missed approach, either before or after the normal termination point, the radar controller shall pass missed approach instructions (see 9.6.1.8).
10. Use of radar in the aerodrome control service
10.1 Surveillance radar
10.1.1 When authorized by and subject to conditions prescribed by the appropriate ATS authority, surveillance radar may be used in the provision of aerodrome control service to perform the following functions:
a) radar monitoring of aircraft on final approach;
b) radar monitoring of other aircraft in the vicinity of the aerodrome;
c) establishing radar separation between succeeding departing aircraft; and
d) providing navigation assistance to VFR flights.
10.1.2 Special VFR flights shall not be radar vectored unless special circumstances, such as emergencies, dictate otherwise.
10.1.3 Caution shall be exercised when radar vectoring VFR flights so as to ensure that the aircraft concerned does not inadvertently enter instrument meteorological conditions.
10.1.4 In prescribing conditions and procedures for the use of radar in the provision of aerodrome control service, the appropriate ATS authority shall ensure that the availability and use of radar information will not be detrimental to visual observation of aerodrome traffic.
Note.— Control of aerodrome traffic is in the main based on visual observation of the manoeuvring area and the vicinity of the aerodrome by the aerodrome controller.
10.2 Use of surface movement radar
Note.— Requirements concerning the provision of SMR are contained in Annex 14, Volume I, Chapter 8. Guidance material on the use of SMR is contained in the Air Traffic Services Planning Manual (Doc 9426), Part II.
10.2.1 General provisions
10.2.1.1 The use of surface movement radar (SMR) should be related to the operational conditions and requirements of the particular aerodrome (i.e. visibility conditions, traffic density and aerodrome layout).
10.2.1.2 SMR systems shall to the extent possible enable the detection and display of the movement of all aircraft and vehicles on the manoeuvring area in a clear and unambiguous manner.
10.2.1.3 Aircraft and vehicle radar position indications may be displayed in symbolic or non-symbolic form. Where radar labels are available for display, the capability should be provided for inclusion of aircraft and vehicle identification by manual or automated means.
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