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to the extended centre line of the runway and
located at a specified distance before the threshold;
b) two sides originating at the ends of the inner edge and
diverging uniformly at a specified rate from the
extended centre line of the runway;
c) an outer edge parallel to the inner edge; and
d) The above surfaces shall be varied when lateral offset,
offset or curved approaches are utilized, specifically,
two sides originating at the ends of the inner edge and
diverging uniformly at a specified rate from the
extended centre line of the lateral offset, offset or curved
ground track.
4.1.9 The elevation of the inner edge shall be equal to the
elevation of the mid-point of the threshold.
4.1.10 The slope(s) of the approach surface shall be
measured in the vertical plane containing the centre line of the
runway and shall continue containing the centre line of any
lateral offset or curved ground track.
ANNEX 14 - VOLUME I 4- 1 25/11/04
Annex 14 -Aerodromes Volume I
Approach Take-off climb
Section A-A
%inner approach
Section 8-8
See Figure 4-2 for inner transitional and balked landing obstacle limitation surfaces and
Attachment B for a three-dimensional view
Figure 4-1. Obstacle limitation surfaces
Chapter 4 Annex 14 -Aerodromes
lnner approach Balked
landlng
lnner transitronal
Balked
Inner transitronal landing
Section A-A
Inner trans~bonal Inner horizontal
Balked
landing
Section B-B
Figure 4-2. Inner approach, inner transitional and balked landing obstacle limitation surfaces
Inner approach surface c) an outer edge parallel to the inner edge.
4.1.1 1 Description.- Inner approach surface. A rectangular
w o n of the approach surface immediately preceding the Transitiondss~are
threshold.
4.1.12 Characteristics.- The limits of the inner approach
surface shall comprise:
a) an inner edge coincident with the location of the inner
edge of the approach surface but of its own specified
length;
b) two sides originating at the ends of the inner edge and
extending parallel to the vertical plane containing the
centre line of the runway; and
4.1.13 Description.- Transitional surface. A complex
surface along the side of the strip and part of the side of the
approach surface, that slopes upwards and outwards to the inner
horizontal surface.
4.1.14 Characteristics.- The limits of a transitional
surface shall comprise:
a) a lower edge beginning at the intersection of the side of
the approach surface with the inner horizontal surface and
Annex 14 -Aerodromes Volume I
extending down the side of the approach surface to the
inner edge of the approach surface and from there along
the length of the strip parallel to the runway centre line;
and
b) an upper edge located in the plane of the inner horizontal
surface.
4.1.1 5 The elevation of a point on the lower edge shall be:
a) along the side of the approach surface - equal to the
elevation of the approach surface at that point; and
b) along the strip - equal to the elevation of the nearest
point on the centre line of the runway or its extension.
Note.- As a result of b) the transitional surface along the
strip will be curved ifthe runway profile is curved, or a plane if
the runway profile is a straight line. The intersection of the
transitional surface with the inner horizontal surface will also
be a curved or a straight line depending on the runway profile.
4.1.16 The slope of the transitional surface shall be
measured in a vertical plane at right angles to the centre line of
the runway.
Inner transitional surface
Note.- It is intended that the inner transitional surface be
the controlling obstacle limitation surface for navigation aid,
aircrafl and other vehicles that must be near the runway and
which is not to be penetrated except forji-angible objects. The
transitional surface described in 4.1.13 is intended to remain as
the controlling obstacle limitation surface for buildings, etc.
4.1.1 7 Description.- Inner transitional surface. A surface
similar to the transitional surface but closer to the runway.
4.1.18 Characteristics.- The limits of an inner transitional
surface shall comprise:
a) a lower edge beginning at the end of the inner approach
surface and extending down the side of the inner
approach surface to the inner edge of that surface, from
there along the strip parallel to the runway centre line to
the inner edge of the balked landing surface and from
there up the side of the balked landing surface to the point
where the side intersects the inner horizontal surface; and
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