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reasonably be applied are described in the Airport Services
Manual, Part 6.
4.2.1 1 Recommendation.- New objects or extensions of
existing objects should not be permitted above the approach
surface beyond 3 000 mfi-om the inner edge, the conical surface
or inner horizontal surface except when, in the opinion 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.
- conical surface;
- inner horizontal surface;
- approach surface and inner approach surface;
- transitional surfaces;
- inner transitional surfaces; and
- balked landing surface.
4.2.16 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 4.2.17).
4.2.17 The approach surface shall be horizontal beyond the
4.2.12 Recommendation.- Existing objects above any of point at which the 2.5 per cent slope intersects:
the surfaces required by 4.2.7 should as far as practicable be
removed except when, in the opinion of the appropriate a) a horizontal plane 150 m above the threshold elevation; or
authority, the object is shielded by an existing immovable
object, or ajier aeronautical study it is determined that the b) the horizontal plane passing through the top of any object
object would not adversely affect the safety or significantly that governs the obstacle clearance limit;
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.
Precision approach runways
Note I.- See 9.9 for information regarding siting of
equipment and installations on operational areas.
Note 2.- Guidance on obstacle limitation surfaces for
precision approach runways is given in the Airport Services
Manual, Part 6.
4.2.13 The following obstacle limitation surfaces shall be
established for a precision approach runway category I:
- conical surface;
- inner horizontal surface;
- approach surface; and
- transitional surfaces.
4.2.14 Recommendation.- The following obstacle limitation
surfaces should be established for a precision approach
runway category I:
whichever is the higher.
4.2.1 8 Fixed objects shall not be permitted above the inner
approach surface, the inner transitional surface or the balked
landing surface, except for frangible objects which because of
their function must be located on the strip. Mobile objects shall
not be permitted above these surfaces during the use of the
runway for landing.
4.2.19 New objects or extensions of existing objects shall
not be permitted above an approach surface or a 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.
4.2.20 Recommendation.- New objects or extensions of
existing objects should not be permitted above the conical
surface and the inner horizontal surface except when, in the
opinion of the appropriate authority, an 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.
4.2.21 Recommendation.- Existing objects above an
approach surface, a transitional surface, the conical surface
and inner horizontal surface should as far as practicable be
removed except when, in the opinion of the appropriate
Annex 14 -Aerodromes Volume I
authority, an 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 signifcantly 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
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