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iii) if no clearance to land has been received from the non-radar controller by the time the aircraft reaches a distance of 4 km (2 NM) from touchdown or such other distance as has been agreed with the aerodrome control tower; or
iv)  on instructions by the aerodrome controller; or
b)  be advised to consider executing a missed approach in the following circumstances:
i)  when the aircraft reaches a position from which it appears that a successful approach cannot be completed; or
ii)  if the aircraft is not visible on the radar display for any significant interval during the last 4 km (2 NM) of the approach; or
iii) if the position or identification of the aircraft is in doubt during any portion of the final approach.

VI. Radar Services
In all such cases, the reason for the instruction or the advice should be given to the pilot.
9.6.1.9 Unless otherwise required by exceptional circumstances, radar instructions concerning a missed approach should be in accordance with the prescribed missed approach procedure and should include the level to which the aircraft is to climb and heading instructions to keep the aircraft within the missed approach area during the missed approach procedure.
9.7 Final approach procedures

9.7.1 Surveillance radar approach
9.7.1.1 A final approach using solely surveillance radar should not be carried out if precision approach radar is available, unless meteorological conditions are such as to indicate with reasonable certainty that a surveillance radar approach can be completed successfully.
9.7.1.2 A surveillance radar approach shall only be performed with equipment suitably sited and a radar display specifically marked to provide information on position relative to the extended centre line of the runway to be used and distance from touchdown, and which is specifically approved for the purpose by the appropriate ATS authority.
9.7.1.3 When conducting a surveillance radar approach, the radar controller shall comply with the following:
a)  at or before the commencement of the final approach, the aircraft shall be informed of the point at which the surveillance radar approach will be terminated;
b)  the aircraft shall be informed when it is approaching the point at which it is computed that descent should begin, and just before reaching that point it shall be informed of the obstacle clearance altitude/height and instructed to descend and check the applicable minima;
c)  azimuth instructions shall be given in accordance with the precision approach technique (see 9.7.2.4);
d)  except as provided in 9.7.1.4, distance from touch-down shall normally be passed at every 2 km (each NM);
e)  pre-computed levels through which the aircraft should be passing to maintain the glide path shall also be transmitted at every 2 km (each NM) at the same time as the distance;
f)  the surveillance radar approach shall be terminated:
i)  at a distance of 4 km (2 NM) from touchdown, except as provided in 9.7.1.4; or
ii)  before the aircraft enters an area of continuous radar clutter; or
iii) when the pilot reports that a visual approach can be effected;
whichever is the earliest.

9.7.1.4 When, as determined by the appropriate ATS authority, the accuracy of the radar equipment permits, surveillance radar approaches may be continued to the threshold of the runway, or to a prescribed point less than 4 km (2 NM) from touchdown, in which case:
a)  distance and level information shall be given at each km (each half NM);
b)  transmission should not be interrupted for intervals of more than five seconds while the aircraft is within a distance of 8 km (4 NM) from touchdown;
c)  the radar controller should not be responsible for any duties other than those directly connected with a particular approach.

9.7.1.5 Levels through which the aircraft should pass to maintain the required glide path, and the associated distances from touchdown, shall be pre-computed and displayed in such a manner as to be readily available to the radar controller.
　
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