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3.2 Availability
3.5 Format
3.2.1 Aerodrome Obstacle Charts - ICAO Type A
(Operating Limitations) shall be made available in the manner 3.5.1 The charts shall depict a plan and profile of each
prescribed in 1.3.2 for all aerodromes regularly used by
Nnway, any associated stopway Or 'learway* the take-off
international civil aviation, except for those aerodromes where flight path area, and significant obstacles.
there are no significant obstacies in the take-off flight path
areas. 3.5.2 The profile for each runway, stopway, cleanvay and
the obstacles in the take-off flight path area shall be shown
3.2.2 Where a chart is not required because no significant above its corresponding plan. The'profile of an alternative
obstacles exist in the take-off flight path area, a notification to take-off flight path area shall comprise a linear projection of
this effect shall be published. the full take-off flight path and shall be disposed above its
corresponding plan in the manner most suited to the ready
interpretation of the information.
3.3 Units of measurement
3.3.1 Elevations shall be shown to the nearest half-metre
or to the nearest foot.
3.3.2 Linear dimensions shall be shown to the nearest
half-metre.
3.4 Coverage and scale
3.4.1 The extent of each plan shall be sufficient to cover
all significant obstacles.
Note.- Isolated distant significant obstacles that would
unnecessarily increase the sheet size may be indicated by the
appropriate symbol and an arrow, provided that the distance
and bearing from the end of the runway farthest removed and
the elevation are given.
3.4.2 The horizontal scale shall be within the range of
1:10 000 to 1:15 000.
3.4.3 Recommendation.- The horizontal scale should
be 1:10 000.
3.5.3 A profile grid shall be ruled over the entire profile
area exclusive of the runway. The zero for vertical coordinates
shall be mean sea level. The zero for horizontal coordinates
shall be the end of the runway furthest from the take-off flight
path area concerned. Graduation marks indicating the subdivisions
of intervals shall be shown along the base of the grid
and along the vertical margins.
3.5.3.1 Recommendation.- The vertical grid should
have intervals of 30 m (I00 ft) and the horizontal grid should
have intervals of 300 m ( I 000 ft).
3.5.4 The chart shall include:
a) a box for recording the operational data specified in
3.8.3;
b) a box for recording amendments and dates thereof.
3.6 Identification
The chart shall be identified by the name of the country in
which the aerodrome is located, the name of the city or town,
or area, which the aerodrome serves, the name of the
aerodrome and the designator(s) of the runway(s).
ANNEX 4 3-1 1/11/01
Annex 4 - Aeronautical Charts Chapter 3
3.7 Magnetic variation path gradient of less than 1.2 per cent, the extent of the takeoff
flight path area specified in 3.8.2.1 c) shall be increased to
The magnetic variation to the nearest degree and date of not less than 12.0 km (6.5 NM) and the slope of the plane
information shall be indicated. surface specified in 3.8.1.1 and 3.8.1.2 shall be reduced to
1.0 per cent or less.
3.8 Aeronautical data
3.8.1 Obstacles
3.8.1.1 Obstacles 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 significant obstacles, except that significant
obstacles lying wholly below the shadow of other
significant obstacles as defined in 3.8.1.2 need not be shown.
Mobile obstacles such as boats, trains, trucks, etc., which may
project above the 1.2 per cent plane shall be considered
significant 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
at 3.8.1.1 or to the next higher significant 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 significant obstacle creating a shadow is
likely to be removed, objects that would become significant
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
　
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