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No. 53
Anna 4 -Aeronautical Charts Chapter 3
3.7 Magnetic variation
The magnetic variation to the nearest degree and date of
information shall be indicated.
3.8 Aeronautical data
not less than 12.0 km (6.5 NM) and the slope of the plane
surface specified in 3.8.1.1 and 3.8.1.2 shall be reduced to
1.0 per cent or less.
Note.- When a 1.0 per cent survey plane touches no
obstacles, this plane may be lowered until it touches the first
obstacle.
3.8.1 Obstacles
3.8.3 Declared distances
3.8.1.1 Objects in the take-off flight path area which
project above a plane surface having a 1.2 per cent slope and
having a common origin with the take-off flight path area,
shall be regarded as obstacles, except that obstacles lying
wholly below the shadow of other obstacles as defined in
3.8.1.2 need not be shown. Mobile objects such as boats, trains
and trucks, which may project above the 1.2 per cent plane,
shall be considered obstacles but shall not be considered as
being capable of creating a shadow.
3.8.1.2 The shadow of an obstacle is considered to be a
plane surface originating at a horizontal line passing through
the top of the obstacle at right angles to the centre line of the
take-off flight path area. The plane covers the complete width
of the take-off flight path area and extends to the plane defined
in 3.8.1.1 or to the next higher obstacle if it occurs first. For
the first 300 m (1 000 ft) of the take-off flight path area, the
shadow .planes are horizontal and beyond this point such
planes have an upward slope of 1.2 per cent.
3.8.1.3 If the obstacle creating a shadow is likely to be
removed, objects that would become obstacles by its removal
shall be shown.
3.8.2 Take-off flight path area
3.8.2.1 The take-off flight path area consists of a
quadrilateral area on the surface of the earth lying directly
below, and symmetrically disposed about, the take-off flight
path. This area has the following characteristics:
a) it commences at the end of the area declared suitable for
take-off (i.e. at the end of the runway or clearway as
appropriate);
b) its width at the point of origin is 180 m (600 ft) and this
width increases at the rate of 0.25D to a maximum of
1 800 m (6 000 ft), where D is the distance fiom the
point -of origin; .
c) it extends to the point beyond which no obstacles exist
or to a distance of 10.0 krn (5.4 NM), whichever is the
lesser.
3.8.3.1 The following information for each direction of
each runway shall be entered in the space provided:
a) take-off run available;
b) accelerate-stop distance available;
c) take-off distance available;
d) landing distance available.
Note.- In Annex 14. Volume I, Attachment A, Section 3,
guidance is given on declared distances.
3.8.3.2 Recommendation.- Where a declared distance
is not provided because a runway is usable in one direction
only, that runway should be identified as "not usable for takeoff;
landing or both ".
3.8.4 Plan and profile views
3.8.4.1 The plan view shall show:
a) the outline of the runways by a solid line, including the
length and width, the magnetic bearing to the nearest
degree, and the runway number;
b) the outline of the clearways by a broken line, including
the length and identification as such;
c) take-off flight path areas by a dashed line and the centre
line by a fine line consisting of short and long dashes;
d) alternative take-off flight path areas. When alternative
take-off flight path areas not centred on the extension of
the runway centre line are shown, notes shall be
provided explaining the significance of such areas;
e) obstacles, including:
1) the exact location of each obstacle together with a
symbol indicative of its type;
3.8.2.2 For runways serving aircraft having operating 2) the elevation and identification of each obstacle;
limitations which do not preclude the use of a take-off flight
path gradient of less than 1.2 per cent, the extent of the take- 3) the limits of-penetration of obstacles of large extent in
off flight path area specified in 3.8.2.1 c) shall be increased to a distinctive manner identified in the legend.
Chapter 3 Annex 4 -Aeronautical Charts
Note.- This does not exclude the necessity for
indicating crjtical spot elevations within the take-of
flight path area.
3.8.4.1.1 Reco~mmendation.- The nature of the runway
and stopway surfac~?ss hould be indicated.
3.8.4.1.2 Recommendation.- Stopways should be identijied
as such and should be shown by a broken line.
3.8.4.1.3 When stopways are shown, the length of each
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