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stopway shall be indicated.
3.8.4.2 The profile view shall show:
a) the profile of' the centre line of the runway by a solid
line and the profile of the centre line of any associated
stopways and clearways by a broken line;
b) the elevation of the runway centre line at each end of the
runway, at the stopway and at the origin of each takeoff
flight path area, and at each significant change in
slope of runway and stopway;
c) obstacles, including:
1) each obstacle by a solid vertical line extending from a
convenient. grid line over at least one other grid line to
the elevation of the top of the obstacle;
2) identification of each obstacle;
3) the limits of penetration of obstacles of large extent in
a distinctive manner identified in the legend.
Note.- An obstacle profile consisting of a line
joining the tops of each obstacle and representing the
shadow created by successive obstacles may be shown.
3.9 Accuracy
3.9.1 The order of accuracy attained shall be shown on
the chart.
3.9.2 Recommendation.- The horizontal dimensions
and the elevations of the runway, stopway and cleanvay to be
printed on the chart should be determined to the nearest 0.5 m
(1 8).
3.9.3 Recommendation.- The order of accuracy of the
field work and the precision of chart production should be
such that measurements in the take-offflight path areas can
be taken from the chart within the following maximum
deviations:
I) horizontal distances: 5 m (I5 3) at a point of origin
increasing at a rate of 1 per 500;
2) vertical distances: 0.5 m (1.5 f) in the first 300 m
(1 000 f) and increasing at a rate of 1 per 1 000.
3.9.4 Datum. Where no accurate datum for vertical
reference is available, the elevation of the datum used shall be
stated and shall be identified as assumed.
2511 1/04
No. 53
CHAPTER 4. AERODROME OBSTACLE CHART -
ICAO TYPE B
4.1 Function 4.4.2 The horizontal scale shall be within the range of.
1:lO 000 to 1:20 000.
This chart shall pr~ovide information to satisfy the following
functions: 4.4.3 A horizontal linear scale showing both metres and
feet shall be included in the chart. When necessary, a linear
a) the determin.ation of minimum safe altitudesiheights scale for kilometres and a linear scale for nautical miles shall
including those for circling procedures; also be shown.
b) the determin:ition of procedures for use in the event of
an emergency during take-off or landing;
c) the application of obstacle clearing and marking criteria; 4.5 Format
and
The charts shall include:
d) the provision of source material for aeronautical charts.
a) any necessary explanation of the projection used;
b) any necessary identification of the grid used;
4.2 Availability
4.2.1 Recomn~endation.- Aerodrome Obstacle Charts
- ICAO Type B (should be made available, in the manner
prescribed in 1.3.2, for all aerodromes regularly used by
international civil aviation.
4.2.2 When n chart combining the specifications of
Chapters 3 and 4 is made available, it shall be called the
Aerodrome Obstacle Chart - ICAO (Comprehensive).
c) a notation indicating that obstacles are those which
penetrate the surfaces specified in Annex 14, Volume I,
Chapter 4;
d) a box for recording amendments and dates thereof;
e) outside the neat line, every minute of latitude and
longitude marked in degrees and minutes.
Note.- Lines of latitude and longitude may be shown
across the face of the chart.
4.13 Units of measurement
4.3.1 Elevations shall be shown to the nearest half-metre 4.6 Identification
or to the nearest foot.
The chart shall be identified by the name of the country in
4.3.2 Linear dimensions shall be shown to the nearest which the aerodrome is located, the name of the city or town,
half-metre. or area, which the aerodrome serves and the name of the
aerodrome.
4.4 Coverage and scale
4.4.1 The extent of each plan shall be sufficient to cover 4.7 Culture and topography
all obstacles.
4.7.1 Drainage and hydrographic details shall be kept to a
Note.- Isolated distant obstacles that would unnecessarily minimum.
increase the sheet size may be indicated by the appropriate
symbol and an arrow, provided that the distance and 4.7.2 Buildings and other salient features associated with
bearing from the aerodrome reference point and elevation are the aerodrome shall be shown. Wherever possible, they shall
given. be shown to scale.
ANNEX 4 25/11/04
No. 53
Annex 4 -Aeronautical Charts Chapter 4
4.7.3 All objects, either cultural or natural, that project
above the take-off and approach surfaces specified in 4.9 or
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