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b) employed in accordance with a pre-arranged plan
established with the aerodrome control tower.
7.5.3.2.3.2 When communications by a system of visual
signals is deemed to be adequate, or in the case of radiocommunication
failure, the signals given hereunder shall have
the meaning indicated therein:
Light signal from
aerodrome control Meaning
Green flashes Permission to cross landing area or
to move onto taxiway
Steady red Stop
Red flashes Move off the landing area or taxiway
and watch out for aircraft
White flashes Vacate manoeuvring area in accordance
with local instructions
7-8 Air Traffic Management (PANS-ATM)
1/11/01
7.5.3.2.3.3 In emergency conditions or if the signals in
7.5.3.2.3.2 are not observed, the signal given hereunder shall
be used for runways or taxiways equipped with a lighting
system and shall have the meaning indicated therein.
7.5.3.2.3.4 When employed in accordance with a plan
pre-arranged with the aerodrome control tower, constructional
and maintenance personnel should not normally be required to
be capable of maintaining two-way radiocommunication with
the aerodrome control tower.
7.6 CONTROL OF TRAFFIC IN THE
TRAFFIC CIRCUIT
7.6.1 General
7.6.1.1 Aircraft in the traffic circuit shall be controlled to
provide the separation minima outlined in 7.8.2, 7.8.3, 7.9.1
and 7.9.2 and Chapter 5, Section 5.8, except that:
a) aircraft in formation are exempted from the separation
minima with respect to separation from other aircraft
of the same flight;
b) aircraft operating in different areas or different
runways on aerodromes suitable for simultaneous
landings or take-offs are exempted from the separation
minima;
c) separation minima shall not apply to aircraft operating
under military necessity in accordance with
Chapter 16, Section 16.1.
7.6.1.2 Sufficient separation shall be effected between
aircraft in flight in the traffic circuit to allow the spacing of
arriving and departing aircraft as outlined in 7.8.2, 7.8.3, 7.9.1
and 7.9.2 and Chapter 5, Section 5.8.
7.6.2 Entry of traffic circuit
7.6.2.1 The clearance to enter the traffic circuit should be
issued to an aircraft whenever it is desired that the aircraft
approach the landing area in accordance with current traffic
circuits but traffic conditions do not yet allow a landing
clearance to be issued. Depending on the circumstances and
traffic conditions, an aircraft may be cleared to join at any
position in the traffic circuit.
7.6.2.2 An arriving aircraft executing an instrument
approach shall normally be cleared to land straight in unless
visual manoeuvring to the landing runway is required.
7.6.3 Priority for landing
7.6.3.1 If an aircraft enters an aerodrome traffic circuit
without proper authorization, it shall be permitted to land if its
actions indicate that it so desires. If circumstances warrant,
aircraft which are in contact with the controller may be
instructed by the controller to give way so as to remove as
soon as possible the hazard introduced by such unauthorized
operation. In no case shall permission to land be withheld
indefinitely.
7.6.3.2 In cases of emergency it may be necessary, in the
interests of safety, for an aircraft to enter a traffic circuit and
effect a landing without proper authorization. Controllers
should recognize the possibilities of emergency action and
render all assistance possible.
7.6.3.3 Priority shall be given to:
a) an aircraft which anticipates being compelled to land
because of factors affecting the safe operation of the
aircraft (engine failure, shortage of fuel, etc.);
b) hospital aircraft or aircraft carrying any sick or
seriously injured persons requiring urgent medical
attention;
c) aircraft engaged in search and rescue operations; and
d) other aircraft as may be determined by the appropriate
authority.
Note.— An aircraft which has encountered an emergency is
handled as outlined in Chapter 15, Section 15.1.
7.7 ORDER OF PRIORITY FOR ARRIVING
AND DEPARTING AIRCRAFT
An aircraft landing or in the final stages of an approach to land
shall normally have priority over an aircraft intending to depart
from the same or an intersecting runway.
Light signal Meaning
Flashing runway or
taxiway lights
Vacate the runway and observe the
tower for light signal
Chapter 7. Procedures for Aerodrome Control Service 7-9
1/11/01
7.8 CONTROL OF DEPARTING AIRCRAFT
7.8.1 Departure sequence
Departures shall normally be cleared in the order in which they
are ready for take-off, except that deviations may be made
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