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150".
Helidecks
Note.- The following specifications are for helidecks
located on a structure and engaged in such activities as
mineral exploitation, research, or construction, but excluding
heliports on ships.
4.2.12 A helideck shall have an obstacle-free sector and,
where necessary, a limited obstacle sector.
4.2.13 There shall be no fixed obstacles within the
obstacle-free sector above the obstacle-free surface.
4.2.14 In the immediate vicinity of the helideck, obstacle
protection for helicopters shall be provided below the heliport
level. This protection shall extend over an arc of at least 180"
with the origin at the centre of the FATO, with a descending
gradient having a ratio of one unit horizontally to five units
vertically from the edges of the FAT0 within the 18O" sector.
4.2.15 Where a mobile obstacle or combination of
obstacles within the obstacle-free sector is essential for the
operation of the installation, the obstacle(s) shall not subtend
an arc exceeding 30°, as measured from the centre of the
FATO.
4.2.16 For single-main-rotor and side-by-side twin rotor
helicopters, within the 150" limited obstacle surface/sector out
to a distance of 0.62 D, measured from the centre of the
FATO, objects shall not exceed a height of 0.05 D above the
FATO. Beyond that arc, out to an over-all distance of 0.83 D
the limited obstacle surface rises at a rate of one unit vertically
for each two units horizontally (see Figure 4-3).
4.2.17 For omnidirectional operations by tandem-mainrotor
helicopters within the 150" limited obstacle
surfacelsector out to a distance of 0.62 D, measured from the
centre of the FATO, there shall be no fixed obstacles. Beyond
that arc, out to an over-all distance of 0.83 D, objects shall not
penetrate a level surface which has a height equivalent to
0.05 D above the FAT0 (see Figure 4-4).
4.2. I8 For bi-directional operations by tandem-mainrotor
helicopters, within the 0.62 D arc in the 150' limited
obstacle surface/sector, objects shall not penetrate a level
surface which has a height equivalent to I . 1 m above the
FAT0 (see Figure 4-5).
Shipboard heliports
Amidships location
4.2.19 Forward and aft of the FAT0 shall be two
symmetrically located sectors, each covering an arc of 150",
with their apexes on the periphery of the FAT0 D reference
circle. Within the area enclosed by these two sectors, there
shall be no objects rising above the level of the FATO, except
those aids essential for the safe operation of a helicopter and
then only up to a maximum height of 25 cm.
4.2.20 To provide further protection from obstacles fore
and aft of the FATO, rising surfaces with gradients of one unit
vertically to five units horizontally shall extend from the entire
length of the edges of the two 150" sectors. These surfaces
shall extend for a horizontal distance equal to at least the
diameter of the FAT0 and shall not be penetrated by any
obstacle (see Figure 4- 1 1 ).
Ship 's side location
4.2.21 From the fore and aft mid-points of the D
reference circle, an area shall extend to the ship's rail to a fore
and aft distance of 1.5 times the diameter of the FATO,
located symmetrically about the athwartships bisector of the
reference circle. Within this sector there shall be no objects
rising above the level of the FATO. except those aids essential
to the safe operation of the helicopter and then only up to a
maximum height of 25 cm (see Figure 4-12).
4.2.22 A horizontal surface shall be provided, at least
0.25 times the diameter of the D reference circle, which shall
surround the FAT0 and the obstacle-free sector, at a height of
0.05 times the diameter of the reference circle, which no object
shall penetrate.
Annex 14 - Aerodromes Volume I1
JB
Approach Take.off climb
Approach Transitional
k \ / lnner horizontal
k- FAT0
Section 6-6
Note.- The figure shows the obstacle limitation surfaces at a heliport
with a non-precision approach FAT0 and a clearway.
Figure 4-1. Obstacle limitation surfaces
Chapter 4 Annex 14 - Aerodromes
210° sector
Alternative positions on the
periphery and swinging the whole
sector + 15O from that shown may
be used in satisfying requirements
PROFILE
Within 210° sector
Landing area no objects above this line
No fixed obstacle No fixed obstacle
between these between these
lines in 180° lines in 180°
sector in 180° sector sector
- ,--
Water level Water level
Figure 4-2. Helideck obstacle-free sector
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