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extending to a specified distance.
4.1.22 Characteristics. An obstacle-free sector/surface
shall subtend an arc of specified angle.
4.1.23 For helidecks the obstacle-free sector shall subtend
an arc of 210" and extend outwards to a distance compatible
with the one-engine inoperative capability of the most critical
helicopter the helideck is intended to serve. The surface shall
be a horizontal plane level with the elevation of the helideck
except that, over an arc of 180" passing through the centre of
the FATO, the surface shall be at water level, extending
outwards for a distance compatible with the take-off space
required for the most critical helicopter the helideck is
intended to serve (see Figure 4-2).
Limited obstacle surface - helidecks
4.1.24 Description. A complex surface originating at the
reference point for the obstacle-free sector and extending over
the arc not covered by the obstacle-free sector as shown in
Figures 4-3, 4-4 and 4-5 and within which the height of
obstacles above the level of the FAT0 will be prescribed.
4.1.25 Characteristics. The limited obstacle surface shall
not subtend an arc greater than a specified angle and shall be
sufficient to include that area not covered by the obstacle-free
sector.
4.2 Obstacle limitation requirements
Note.- The requirements for obstacle limitation su$aces
are specified on the baszs of the intended use of a FATO, i.e.
approach manoeuvre to hover or landing, or take-off
manoeuvre and rype of approach, and are intended to be
applied when such use is made of the FATO. In cases where
operations are conducted to or from both directions of a FATO,
then the function of certairi surfaces may he null$ed because
of more stringent requirements of another lower surjface.
Sutface level heliports
4.2.1 The following obstacle limitation surfaces shall be
established for a precision approach FATO:
a) take-off climb surface;
b) approach surface;
c) transitional surfaces; and
d) conical surface.
4.2.2 The following obstacle limitation surfaces shall 'be
established for a non-precision approach FATO:
a) take-off climb surface;
b) approach surface;
C) transitional surfaces; and
d) conical surface if an inner horizontal surface is not
provided.
4.2.3 The following obstacle limitation surfaces shall be
established for a non-instrument FATO:
a) take-off climb surface; and
b) approach surface.
4.2.4 Recommendation.- The following obstacle
limitation su$aces should be established for a non-precision
approach FATO:
a) inner horizontal sug5ace; and
b) conical su$ace.
Note.- An inner horizontal sulface may not be required
if a stmight-in non-precision approach is provided at both
ends.
4.2.5 The slopes of the surfaces shall not be greater than,
and their other dimensions not less than those specified in
Tables 4-1 to 4-4 and shall be located as shown in Figures 4-6
to 4-10.
4.2.6 New objects or extensions of existing objects shall
not be permined above any of the surfaces in 4.2.1 to 4.2.4
above 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.
4.2.7 Recommendation.- Existing objects above any of
the surfaces in 4.2.1 to 4.2.4 above should, as far as
pmcticable, be removed except when, in the opinion of the
appropriate authority, the object is shielded by an existing
inzmovable object or after aeronautiml study it is determined
that the object would not adversely affect the safety or
signiJicantly affect the regularity of operutions of helicopters.
Note.- The application of curved take-off climb sug5aces
as specified in 4.1.19 may alleviate the problems created by
objects infringing these surfaces.
Chapter 4 Annex 14 - Aerodromes
4.2.8 A surface level heliport shall have at least two takeoff
climb and approach surfaces, separated by not less than
150".
4.2.9 Recommendation.- The number and orientation
of take-off, climb und approach surfaces should be such that
the usubility factor of a helipofl is not less than 95 per cent for
the helicopters the heliport is intended to serve.
Elevated heliports
4.2.10 The obstacle limitation requirements for elevated
heliports shall conform to the requirements for surface level
heliports specified in 4.2.1 to 4.2.7.
4.2.11 An elevated heliport shall have at least two takeoff
climb and approach surfaces separated by not less than
　
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