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surface beyond the end of the strip, but below the level of the
strip, be removed unless it is considered they may endanger
4.2 Obstacle limitation requirements aeroplanes.
Note.- The requirements for obstacle limitation surfaces are 4.2.6 Recommendation.- In considering proposed
s~ecifiedonth e basis of the intended use '?fa mwaY*i .e. rake-off construction, account should be taken of the possible future
or landing and type of approach, and are intended to be applied development of an instrument runway and consequent
when such use is made of the runway. In cases where requirement for more stringent obstacle limitation surfaces.
are conducted to or from both directions of a runway, then the
function of certain surfaces may be nullified because of more
stringent requirements of another lower surface.
Non-instrument runways
Non-precision approach runways
4.2.7 The following obstacle limitation surfaces shall be
established for a non-precision approach runway:
4.2.1 The following obstacle limitation surfaces shall be
established for a non-instrument runway: - conical surface;
- inner horizontal surface;
- approach surface; and - conical surface;
- inner horizontal surface; - transitional surfaces.
- approach surface; and
- transitional surfaces.
4.2.2 The heights and slopes of the surfaces shall not be
greater than, and their other dimensions not less than, those
specified in Table 4- 1.
4.2.3 New objects or extensions of existing objects shall
not be permitted above an approach or transitional surface
except when, in the opinion of the appropriate authority, the
new object or extension would be shielded by an existing
immovable object.
Note.- Circumstances in which the shielding principle may
reasonably be applied are described in the Airport Services
Manual, Part 6.
4.2.8 The heights and slopes of the surfaces shall not be
greater than, and their other dimensions not less than, those
specified in Table 4-1, except in the case of the horizontal
section of the approach surface (see 4.2.9).
4.2.9 The approach surface shall be horizontal beyond the
point at which the 2.5 per cent slope intersects:
a) a horizontal plane 150 m above the threshold elevation; or
b) the horizontal plane passing through the top of any object
that governs the obstacle clearance altitudeheight
(OCAW;
whichever is the higher.
Annex 14 -Aerodromes Volume 1
Table 4-1. Dimensions and slopes of obstacle limitation surfaces -Approach runways
APPROACH RUNWAYS
RUNWAY CLASSIFICATION
Precision approach category
Non-precision approach I I1 or 111
Code number Code number Code number Code number
Surface and dimensionsa 1 2 3 4 1,2 3 4 1,2 3.4 3,4
(1) (2) (3) (4) (5) (6) (7) (8) (9) (10) (11)
CONICAL
Slope 5% 5% 5% 5% 5% 5% 5% 5% 5% 5%
Height 35 m 55 m 75 m 100 m 60 m 75 m 100 m 60m 100m 100m
INNER HORIZONTAL
Height 45 m 45 m 45 m 45 m 45 m 45 m 45 m
Radius 2 000 m 2 500 m 4 000 m 4 000 m 3 500 m 4 000 m 4 000 m
INNER APPROACH
Width - - - - - - -
Distance from threshold - - - - - - -
Length - - - - - - -
Slope
APPROACH
Length of inner edge 60m 80m 150m 150m 150 m 300 m 300 m
Distance from threshold 30m 60m 60m 60m 60m 60m 60m
Divergence (each side) 10% 10% 10% 10% 15% 15% 15%
First section
Length
Slope
Second section
Length
Slope
Horizontal section
- - - - - a m m b a m m b
Total length - - - - - 15000m 15000m
TRANSITIONAL
Slope 20% 2Q?? 14.3% 14.3% 20% 14.3% 14.3%
INNER TRANSITIONAL
slope - - - - -
BALKED LANDING SURFACE
Length of inner edge - - - - - -
Distance from threshold - - - - - - -
Divergence (each side) - - - - - - -
Slope - - - - - - -
a. All dimensions are measured horizontally unless specified otherwise.
b. Variable length (see 4.2.9 or 4.2.17).
c. Distance to the end of strip.
d. Or end of runway whichever is less.
e. Where the code letter is F (Column (3) of Table 1-1). the width is increased to 155 m.
Chapter 4 Annex 14 - Aerodromes
4.2.10 New objects or extensions of existing objects shall - inner approach surface;
not be permitted above an approach surface within 3 000 m of - inner transitional surfaces; and
the inner edge or above a transitional surface except when, in - balked landing surface.
the opinion of the appropriate authority, the new object or
extension would be shielded by an existing immovable object. 4.2.15 The following obstacle limitation surfaces shall be
established for a precision approach runway category I1 or 111:
Note.- Circumstances in which the shielding principle may
　
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