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m) significant obstacles at their exact location, including:
1) a symbol indicative of their type;
2) elevation;
3) identification;
4) limits of penetration of large extent in a distinctive
manner identified in the legend;
Note.- This does not exclude the necessity for
indicating critical spot elevations within the take-off
and approach areas.
n) any additional obstacles, as determined by 3.8.1.1
including the obstacles in the shadow of a significant
obstaclc, which would othcrwisc bc cxcmptcd.
Note.- The specifications in Annex 14. Volume I.
Chapter 4, are minimum requirements. Where the competent
authority has established lower surfaces, they may be used in
the determination of sign#cant obstacles.
4.9.1.1 Recommendation.- The nature of the runway
and stopway surfaces should be given.
4.9.1.2 Recommendation.- Wherever practicable the
highest object or obstacle between adjacent approach areas
within a radius of 5 000 m (15 000 3) from the aerodrome
reference point should be indicated in a prominent manner.
4.9.1.3 Recommendation.- The extent of tree areas and
relief feutures, purr of which constitute signi'cant obstacles,
should be shown.
4.10 Accuracy
4.10.1 The order of accuracy attained shall be shown on
the chart.
4.10.2 Recommendation.- The horizontal dimensions
and the elevations of the movement area, stopways and
clearways to be printed on the chart should be determined to
the nearest 0.5 m ( I fr).
Chapter 4 Annex 4 - Aeronautical Charts
4.10.3 Recommendation.- The order or accuracy of
the jield work and the precision of chart production should be
such that the resulting data will be within the maximum
deviutions indicated herein:
a) Takp-ofS and approach areas:
1) horizontal distances: 5 rn (15 ft) at point of origin
increasing at a rate of 1 per 500; ,
2) venicul distances: 0.5 rn (1.5 9) in the first
300 m (1 000 ft) and increasing at a rate of 1 per
1 000.
b) Other areas:
1) horizontal distances: 5 m (15 ft) within 5 000 m
(15 000 fr) of the aerodrome reference point and
12 m (403) beyond that area;
2) vertical distances: I rn (38) within 1 500 m (5 0003)
of the aerodrome reference point increasing at a rate
of 1 per 1 000.
4.10.4 Datum. Where no accurate datum for vertical
reference is available, the elevation of the datum used shall be
stated and identified as assumed.
CHAPTER 5. AERODROME OBSTACLE CHART -
ICAO TYPE C
5.1 Function
When produced, this chart shall provide the obstacle data
necessary to enable an operator to develop procedures to
comply with the operating limitations of Annex 6, Parts I and
II, Chapter 5, and Part 111, Chapter 3, with particular reference
to information on obstacles that limit the maximum
permissible take-off mass, and also to:
a) determine minimum safe heights including those for
circling procedures;
b) determine procedures for use in the event of an
emergency during take-off or landing;
C) provide source material for aeronautical charts and
aeronautical data bases.
Note.- An explanation of the intended purpose and use of
this chart is given in the Aeronautical Chart Manual
(Doc 8697).
c) to provide topographical information covering a
distance of approximately 45 km (24 NM) from the
aerodrome reference point.
5.3.2 The horizontal scale shall be within the range of
1:20 000 to 1:100 000.
Note.- A scale of 1:50 000 is preferred.
5.4 Format
The chart shall include:
a) any necessary explanation of the projection used;
b) any necessary identification of the grid used;
c) a box for recording amendments and dates thereof;
d) a box for recording the declared distances specified
in 5.8.2;
5.2 Availability
This chart is not required where:
a) the obstacle data specified in 5.1 are published in the
AIP; or
b) no significant obstacles exist and notification of this is
published in the AIP.
5.3 Coverage and scale
5.3.1 The extent of each chart shall be sufficient:
a) to cover all significant obstacles, including obstacles in
the shadow of a significant obstacle, 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. Account shall be taken
of mobile obstacles such as boats, trains, trucks, etc.,
which may project above the 1.2 per cent plane;
b) to cover all obstacles exceeding 120 m (400 ft) above
the lowest elevation on the runway(s) which may
influence the maximum permissible take-off mass or the
　
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