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operations in RVR conditions less than a value of 550 m.
7.10.3 Low visibility operations shall be initiated by or
through the aerodrome control tower.
7.10.4 The aerodrome control tower shall inform the
approach control unit concerned when procedures for
precision approach category II/III and low visibility operations
will be applied and also when such procedures are no longer
in force.
7.10.5 Provisions regarding low visibility operations
should specify:
a) the RVR value(s) at which the low visibility operations
procedures shall be implemented;
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b) the minimum ILS/MLS equipment requirements for
category II/III operations;
c) other facilities and aids required for category II/III
operations, including aeronautical ground lights, which
shall be monitored for normal operation;
d) the criteria for and the circumstances under which
downgrading of the ILS/MLS equipment from
category II/III operations capability shall be made;
e) the requirement to report any relevant equipment
failure and degradation, without delay, to the flight
crews concerned, the approach control unit, and any
other appropriate organization;
f) special procedures for the control of traffic on the
manoeuvring area, including;
1) the runway-holding positions to be used;
2) the minimum distance between an arriving and a
departing aircraft to ensure protection of the
sensitive and critical areas;
3) procedures to verify that aircraft and vehicles have
vacated the runway;
4) procedures applicable to the separation of aircraft
and vehicles;
g) applicable spacing between successive approaching
aircraft;
h) action(s) to be taken in the event low visibility
operations need to be discontinued, e.g. due to
equipment failures; and
i) any other relevant procedures or requirements.
Note.— Further information regarding the requirements
for low visibility operations can be found in the Air Traffic
Services Planning Manual (Doc 9426) and the All Weather
Operations Manual (Doc 9365).
7.10.6 The aerodrome control tower shall, prior to a
period of application of low visibility procedures, establish a
record of vehicles and persons currently on the manoeuvring
area and maintain this record during the period of application
of these procedures to assist in assuring the safety of
operations on that area.
Note.— See also 7.5.3.2.
7.11 SUSPENSION OF VISUAL FLIGHT RULES
OPERATIONS
7.11.1 Any or all VFR operations on and in the vicinity
of an aerodrome may be suspended by any of the following
units, persons or authorities whenever safety requires such
action:
a) the approach control unit or the appropriate ACC;
b) the aerodrome control tower;
c) the appropriate ATS authority.
7.11.2 All such suspensions of VFR operations shall be
accomplished through or notified to the aerodrome control
tower.
7.11.3 The following procedures shall be observed by the
aerodrome control tower whenever VFR operations are
suspended:
a) hold all VFR departures;
b) recall all local flights operating under VFR or obtain
approval for special VFR operations;
c) notify the approach control unit or ACC as appropriate
of the action taken;
d) notify all operators, or their designated representatives,
of the reason for taking such action, if necessary or
requested.
7.12 AUTHORIZATION OF SPECIAL
VFR FLIGHTS
7.12.1 When traffic conditions permit, special VFR
flights may be authorized subject to the approval of the unit
providing approach control service and the provisions of
7.12.1.3.
7.12.1.1 Requests for such authorization shall be handled
individually.
7.12.1.2 Separation shall be effected between all IFR
flights and special VFR flights in accordance with separation
minima in Chapters 5 and 6 and, when so prescribed by the
appropriate ATS authority, between all special VFR flights in
accordance with separation minima prescribed by that
authority.
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7.12.1.3 When the ground visibility is not less than
1 500 m, special VFR flights may be authorized to: enter a
control zone for the purpose of landing, take off and depart
from a control zone, cross a control zone or operate locally
within a control zone.
Note.— Requirements for two-way communications
between controlled flights and the appropriate air traffic
control unit are contained in Annex 2, 3.6.5.
7.13 AERONAUTICAL GROUND LIGHTS
7.13.1 Operation
　
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