13.3.1 The helideck should be of a design and
construction, adequate for the intended service and for the appropriate
prevailing climatic conditions, approved to the satisfaction of the
Administration.
13.3.2 Except as provided for in paragraph 13.3.3,
the helideck should meet the following provisions, with reference
to the ICAO Convention, Annex 14, Volume II (Heliports), taking into
account the type of helicopter used, the conditions of wind, turbulence,
sea state, water temperature and icing conditions:
-
.1 the helideck should be of sufficient size to
contain an area within which can be drawn a circle of diameter not
less than D for single main rotor helicopters;
-
.2 a helideck obstacle-free sector should comprise
of two components, one above and one below helideck level (see figure 13-1):
-
.2.1 above helideck level: The surface should
be a horizontal plane level with the elevation of the helideck surface
that subtends an arc of at least 210° with the apex located on
the periphery of the D reference circle extending outwards
to a distance that will allow for an unobstructed departure path appropriate
to the helicopter(s) the helideck is intended to serve; and
-
.2.2 below helideck level: Within the (minimum)
210° arc, the surface should additionally extend downward at a
5:1 falling gradient from the edge of the safety net below the elevation
of the helideck to water level for an arc of not less than 180°
that passes through the centre of the FATO and outwards to a distance
that will allow for safe clearance from the obstacles below the helideck
in the event of an engine failure for the type of helicopter(s) the
helideck is intended to serve (see figure
13-1);
-
.3 for single main rotor helicopters, within the
150° LOS out to a distance of 0.12 D, measured from
the point of origin of the LOS, objects should not exceed a height
of 0.25 m above the helideck. Beyond that arc, out to a distance of
an additional 0.21 D, the maximum obstacle height is
limited to a gradient of one unit vertically for each two units horizontally
originating at a height of 0.05 D above the level of
the helideck (see figure 13-2
footnote);
-
.4 objects the function of which requires that
they be located on the helideck within the FATO should be limited
to landing nets (where required) and certain lighting systems and
should not exceed the surface of the landing area by more than 0.025
m. Such objects should only be present provided they do not cause
a hazard to helicopter operations; and
-
.5 operations by tandem main rotor helicopters
should be specially considered by the Administration.
13.3.3 For benign climates as determined by the
coastal State, taking into account the type of helicopter used, the
conditions of wind, turbulence, sea state, water temperature and icing
conditions, the helideck should meet the following:
-
.1 the helideck should be of sufficient size to
contain a circle of diameter no less than 0.83 D;
-
.2 a helideck obstacle-free sector shall comprise
of two components, one above and one below helideck level (see figure 13-1):
-
.2.1 above helideck level: The surface should
be a horizontal plane level with the elevation of the helideck surface
that subtends an arc of at least 210° with the apex located on
the periphery of the D reference circle extending outwards
to a distance that will allow for an unobstructed departure path appropriate
to the helicopter(s) the helideck is intended to serve, and
-
.2.2 below helideck level: Within the (minimum)
210° arc, the surface should additionally extend downward at a
5:1 falling gradient from the edge of the safety net below the elevation
of the helideck to water level for an arc of not less than 180°
that passes through the centre of the FATO and outwards to a distance
that will allow for safe clearance from the obstacles below the helideck
in the event of an engine failure for the type of helicopter(s) the
helideck is intended to serve (see figure
13-1);
-
.3 for single main rotor helicopters, within 0.415 D to 0.5 D objects should not exceed a height
of 0.025 m. Within the 150° LOS out to a distance of 0.12 D,
measured from the point of origin of the LOS, objects should not exceed
a height of 0.05 m above the helideck. Beyond that arc, out to a distance
of an additional 0.21 D, the LOS rises at a rate of one
unit vertically for each two units horizontally originating at a height
of 0.05 D above the level of the helideck (refer to figure 13-3
footnote);
-
.4 objects the function of which requires that
they be located on the helideck within the FATO should be limited
to landing nets (where required) and certain lighting systems and
should not exceed the surface of the landing area by more than 0.025
m. Such objects should only be present provided they do not cause
a hazard to helicopter operations; and
-
.5 operations by tandem main rotor helicopters
should be specially considered by the Administration.
13.3.4 The helideck should have a skid-resistant
surface.
13.3.5 Where the helideck is constructed in the
form of a grating, the underdeck should be such that the ground effect
is maintained.