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where necessary to avoid congestion and excessive delays on
the manoeuvring area or when warranted by ATFM regulations.
Start-up time procedures should be contained in local
instructions, and should specify the criteria and conditions for
determining when and how start-up times shall be calculated
and issued to departing flights.
7.3.1.1.3 When an aircraft is subject to ATFM
regulations, it should be advised to start up in accordance with
its allocated slot time.
7.3.1.1.4 When delay for a departing aircraft is
anticipated to be less than a time period specified by the
appropriate ATS authority, an aircraft should be cleared to
start-up at its own discretion.
7.3.1.1.5 When delay for a departing aircraft is
anticipated to exceed a time period specified by the appropriate
ATS authority, the aerodrome control tower should issue
an expected start-up time to an aircraft requesting start-up.
7.3.1.1.6 A start-up clearance shall only be withheld
under circumstances or conditions specified by the appropriate
ATS authority.
7.3.1.1.7 If a start-up clearance is withheld, the flight
crew shall be advised of the reason.
7.3.1.2 AERODROME AND METEOROLOGICAL
INFORMATION
7.3.1.2.1 Prior to taxiing for take-off, aircraft shall be
advised of the following elements of information, in the order
listed, with the exception of such elements which it is known
the aircraft has already received:
Chapter 7. Procedures for Aerodrome Control Service 7-3
1/11/01
a) the runway to be used;
b) the surface wind direction and speed, including
significant variations;
c) the QNH altimeter setting and, either on a regular basis
in accordance with local arrangements or if so requested
by the aircraft, the QFE altimeter setting;
d) the air temperature for the runway to be used, in the
case of turbine-engined aircraft;
e) the visibility representative of the direction of take-off
and initial climb, if less than 10 km, or, when
applicable, the RVR value(s) for the runway to be
used;
f) the correct time.
Note.— The meteorological information listed above is to
follow the criteria used for meteorological local routine and
special reports, in accordance with Chapter 11, 11.4.3.2.2
to 11.4.3.2.3.9.
7.3.1.2.2 Prior to take-off aircraft shall be advised of:
a) any significant changes in the surface wind direction
and speed, the air temperature, and the visibility or
RVR value(s) given in accordance with 7.3.1.2.1;
b) significant meteorological conditions in the take-off
and climb-out area, except when it is known that the
information has already been received by the aircraft.
Note.— Significant meteorological conditions in this
context include the occurrence or expected occurrence of
cumulonimbus or thunderstorm, moderate or severe turbulence,
wind shear, hail, moderate or severe icing, severe squall
line, freezing precipitation, severe mountain waves, sand
storm, dust storm, blowing snow, tornado or waterspout in the
take-off and climb-out area.
7.3.1.2.3 Prior to entering the traffic circuit or
commencing its approach to land, an aircraft shall be provided
with the following elements of information, in the order listed,
with the exception of such elements which it is known the
aircraft has already received:
a) the runway to be used;
b) the surface wind direction and speed, including
significant variations therefrom;
c) the QNH altimeter setting and, either on a regular basis
in accordance with local arrangements or, if so
requested by the aircraft, the QFE altimeter setting.
Note.— The meteorological information listed above is to
follow the criteria used for meteorological local routine and
special reports, in accordance with Chapter 11, 11.4.3.2.2 to
11.4.3.2.3.9.
7.3.1.3 ESSENTIAL LOCAL TRAFFIC INFORMATION
7.3.1.3.1 Information on essential local traffic shall be
issued in a timely manner, either directly or through the unit
providing approach control service when, in the judgment of
the aerodrome controller, such information is necessary in the
interests of safety, or when requested by aircraft.
7.3.1.3.2 Essential local traffic shall be considered to
consist of any aircraft, vehicle or personnel on or near the
manoeuvring area or traffic operating in the vicinity of the
aerodrome, which may constitute a hazard to the aircraft
concerned.
7.3.1.3.3 Essential local traffic shall be described so as to
be easily identified.
7.3.1.4 OBSTRUCTED RUNWAY
In the event the aerodrome controller observes, after a take-off
clearance or a landing clearance has been issued, any
　
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