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c) the radar controller should not be responsible for any
duties other than those directly connected with a
particular approach.
8.9.7.1.5 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.
Note.— See the Air Traffic Services Planning Manual
(Doc 9426) regarding pre-computation of levels.
8.9.7.2 PRECISION RADAR APPROACH
8.9.7.2.1 DUTIES OF PRECISION APPROACH CONTROLLER
During the period the radar controller is engaged in giving a
precision approach, the controller should not be responsible
for any duties other than those directly connected with that
particular approach.
8.9.7.2.2 TRANSFER OF CONTROL
Aircraft to be provided with a precision radar approach shall
have been transferred to the radar controller in charge of the
precision approach at a distance of not less than 2 km (1 NM)
from the point of interception of the glide path, unless
otherwise provided by the appropriate ATS authority.
8.9.7.2.3 COMMUNICATIONS
When control of the aircraft is assumed by the radar controller
in charge of the precision approach, a communications check
shall be made on the channel to be used during the precision
approach and the pilot shall be advised that no further
acknowledgement of transmission is required. Thereafter,
transmission should not be interrupted for intervals of more
than five seconds while the aircraft is on final approach.
8.9.7.2.4 AZIMUTH INFORMATION AND CORRECTIONS
8.9.7.2.4.1 The pilot shall be informed at regular
intervals of the aircraft’s position in relation to the extended
centre line of the runway. Heading corrections shall be given
as necessary to bring the aircraft back on to the extended
centre line.
8.9.7.2.4.2 In the case of azimuth deviations, the pilot
should not take corrective action unless specifically instructed
to do so.
8.9.7.2.5 ELEVATION INFORMATION AND ADJUSTMENTS
8.9.7.2.5.1 The aircraft shall be informed when it is
approaching the point of interception of the glide path and, just
before intercepting the glide path, it shall be instructed to
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begin its descent and to check the applicable decision
altitude/height. Thereafter, the aircraft shall be informed at
regular intervals of its position in relation to the glide path.
When no corrections are required, the aircraft should be
informed at regular intervals that it is on the glide path.
Deviations from the glide path shall be given to the aircraft,
together with instructions to adjust the rate of descent if the
corrective action taken by the aircraft does not appear to be
sufficient. The aircraft shall be informed when it starts to
regain the glide path, and immediately before it reaches the
glide path.
8.9.7.2.5.2 In the case of deviations from the glide path,
the pilot should take corrective action on the basis of the
information given by the controller, even though not
specifically instructed to do so.
8.9.7.2.5.3 Prior to the aircraft reaching a point 4 km
(2 NM) from touchdown, or a greater distance as necessary for
faster aircraft, a certain degree of tolerance should be allowed
with regard to deviations from the glide path, and elevation
information need not specify the actual number of metres (or
feet) above or below the glide path unless it is required to
emphasize the rate of change or the extent of the displacement.
Thereafter, any deviations from the glide path should be given
to the aircraft, preferably in terms of specific distances (metres
or feet) above or below the glide path. The use of emphasis in
the manner in which the information is transmitted should
normally be sufficient to expedite action by the pilot when
necessary (e.g. “STILL 20 metres (60 feet) too low”).
8.9.7.2.5.4 Should the elevation element fail during a
precision radar approach, the radar controller shall inform the
aircraft immediately. If possible, the controller shall change to
a surveillance radar approach, informing the aircraft of the
revised obstacle clearance altitude/height. Alternatively, instructions
should be given for a missed approach.
8.9.7.2.6 DISTANCE INFORMATION
The distance from touchdown should be transmitted at
intervals of 2 km (1 NM) until the aircraft reaches a distance
of 8 km (4 NM) from touchdown. Thereafter distance
information should be transmitted at more frequent intervals,
priority being given, however, to the provision of azimuth and
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