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controller or, when applicable, the non-radar controller
when an aircraft making a radar approach is approximately
15 km (8 NM) from touchdown. If landing clearance is not
received at this time, a subsequent notification should be made
at approximately 8 km (4 NM) from touchdown and landing
clearance requested.
8.9.6.1.7 Clearance to land or any alternative clearance
received from the aerodrome controller or, when applicable,
the non-radar controller should normally be passed to the
aircraft before it reaches a distance of 4 km (2 NM) from
touchdown.
8.9.6.1.8 An aircraft making a radar approach should:
a) be directed to execute a missed approach in the
following circumstances:
i) when the aircraft appears to be dangerously
positioned on final approach; or
ii) for reasons involving traffic conflictions; or
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.
In all such cases, the reason for the instruction or the advice
should be given to the pilot.
8.9.6.1.9 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.
8.9.7 Final approach procedures
8.9.7.1 SURVEILLANCE RADAR APPROACH
8.9.7.1.1 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.
8.9.7.1.2 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.
8.9.7.1.3 When conducting a surveillance radar
approach, the radar controller shall comply with the following:
Chapter 8. Radar Services 8-19
1/11/01
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 8.9.7.2.4);
d) except as provided in 8.9.7.1.4, distance from touchdown
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 8.9.7.1.4; 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.
8.9.7.1.4 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;
　
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