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of the appropriate authority, the object would be shielded by an
existing immovable object, or after aeronautical study it is
determined that the object would not adversely affect the safety
or significantly affect the regularity of operations of aeroplanes.
4.2.5 Recommendation.— Existing objects above any of
the surfaces required by 4.2.1 should as far as practicable be
removed except when, in the opinion of the appropriate
authority, the object is shielded by an existing immovable
object, or after aeronautical study it is determined that the
object would not adversely affect the safety or significantly
affect the regularity of operations of aeroplanes.
Note.— Because of transverse or longitudinal slopes on a
strip, in certain cases the inner edge or portions of the inner
edge of the approach surface may be below the corresponding
elevation of the strip. It is not intended that the strip be graded
to conform with the inner edge of the approach surface, nor is
it intended that terrain or objects which are above the approach
surface beyond the end of the strip, but below the level of the
strip, be removed unless it is considered they may endanger
aeroplanes.
4.2.6 Recommendation.— In considering proposed
construction, account should be taken of the possible future
development of an instrument runway and consequent
requirement for more stringent obstacle limitation surfaces.
Non-precision approach runways
4.2.7 The following obstacle limitation surfaces shall be
established for a non-precision approach runway:
— conical surface;
— inner horizontal surface;
— approach surface; and
— transitional surfaces.
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 altitude/height
(OCA/H);
whichever is the higher.
23/11/06
No. 8
Annex 14 — Aerodromes Volume I
25/11/04 4-6
Table 4-1. Dimensions and slopes of obstacle limitation surfaces —Approach runways
APPROACH RUNWAYS
RUNWAY CLASSIFICATION
Precision approach category
Non-instrument
Code number
Non-precision approach
Code number
I
Code number
II or III
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 60 m 100 m 100 m
INNER HORIZONTAL
Height 45 m 45 m 45 m 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 3 500 m 4 000 m 4 000 m
INNER APPROACH
Width — — — — — — — 90 m 120 me 120 me
Distance from threshold — — — — — — — 60 m 60 m 60 m
Length — — — — — — — 900 m 900 m 900 m
Slope 2.5% 2% 2%
APPROACH
Length of inner edge 60 m 80 m 150 m 150 m 150 m 300 m 300 m 150 m 300 m 300 m
Distance from threshold 30 m 60 m 60 m 60 m 60 m 60 m 60 m 60 m 60 m 60 m
Divergence (each side) 10% 10% 10% 10% 15% 15% 15% 15% 15% 15%
First section
Length 1 600 m 2 500 m 3 000 m 3 000 m 2 500 m 3 000 m 3 000 m 3 000 m 3 000 m 3 000 m
Slope 5% 4% 3.33% 2.5% 3.33% 2% 2% 2.5% 2% 2%
Second section
Length — — — — — 3 600 mb 3 600 mb 12 000 m 3 600 mb 3 600 mb
Slope — — — — — 2.5% 2.5% 3% 2.5% 2.5%
Horizontal section
Length — — — — — 8 400 mb 8 400 mb — 8 400 mb 8 400 mb
Total length — — — — — 15 000 m 15 000 m 15 000 m 15 000 m 15 000 m
TRANSITIONAL
Slope 20% 20% 14.3% 14.3% 20% 14.3% 14.3% 14.3% 14.3% 14.3%
INNER TRANSITIONAL
Slope — — — — — — — 40% 33.3% 33.3%
BALKED LANDING SURFACE
Length of inner edge — — — — — — — 90 m 120 me 120 me
Distance from threshold — — — — — — — c 1 800 md 1 800 md
Divergence (each side) — — — — — — — 10% 10% 10%
Slope — — — — — — — 4% 3.33% 3.33%
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