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width, whichever is gnater, of the longestlwidest
helicopter the heliport is intended to serve.
3.2.3 Recommendation.- The slope requirements for
elevated heliports should conform to the requirements for
surfuce level heliporls specified in 3.1.3.
3.2.4 The FAT0 shall be capable of withstanding the
traffic of helicopters the heliport is intended to serve. Design
considerations shall take into account additional loading
resulting from the presence of personnel, snow, freight,
refuelling, fire fighting equipment, etc.
Note.- Guidance on structural design for elevated
heliports Is given in the Heliport Manual.
Safety area
3.2.5 The FAT0 shall be surrounded by a safety area.
3.2.6 The safety area shall extend outwards from the
periphery of the FAT0 for a distance of at least 3 m or
0.25 times the over-all lengthlwidth, whichever is greater, of
the longestlwidest helicopter intended to use the elevated
heliport.
3.2.7 No fixed object shall be permitted on a safety area,
except for frangible objects, which, because of their function,
must be located on the area. No mobile object shall be
permitted on a safety area during helicopter operations.
Chapter 3 Annex 14 -Aerodromes
3.2.8 Objects whose hnction require them to be located
on the safety area shall not exceed a height of 25 cm when
located along the edge of the FAT0 nor penetrate a plane
originating at a height of 25 cm above the edge of the FAT0
and sloping upwards and outwards from the edge of the FATO
at a gradient of 5 per cent.
3.2.9 The surface of the safety area shall not exceed an
upward slope of 4 per cent outwards from the edge of the
FATO.
3.2.10 The surface of the safety area abutting the FAT0
shall be continuous with the FAT0 and be capable of
supporting, without structural damage, the helicopters that the
heliport is intended to serve.
3.3 Helidecks
Note.- The following specifications are for helidecks
located on structures engaged in such activities as mineral
exploitation, research or construction. See 3.4 for shipboard
heliport provisions.
Final approach and take-off area and
touchdown and lif-off area
Note.- On helidecks it is presumed that the FAT0 and the
touchdown and lift-off area will be coincidental. Guidance on
the effects of ai@'ow direction and turbulence, prevailing wind
velocity und high temperatures from gas turbine exhausts or
flare radiated heat on the location of the FAT0 is given in the
Heliport Manual.
3.3.1 A helideck shall be provided with at least one
FATO.
3.3.2 A FATO may be any shape but shall, for a single
main rotor helicopter or side-by-side twin main rotor
helicopter, be of sufficient size to contain an area within which
can be drawn a circle of diameter nor less than 1.0 times D of
the largest helicopter the helideck is intended to serve, where
D is the largest dimension of the helicopter when the rotors are
turning.
3.3.3 Where omnidirectional landings by helicopters
having tandem main rotors are intended, the FAT0 shall be of
sufficient size to contain an area within which can be drawn a
circle of diameter not less than 0.9 times the distance across
the rotors in a fore and aft line. Where these provisions cannot
be met, the FAT0 may be in the form of a rectangle with a
small side not lass than 0.75 D and a long side not less than
0.9 ID but within this rectangle, bi-directional landings only
will be permitted in the direction of the 0.9 D dimension.
3.3.4 No fixed object shall be permitted around the edge
of the FAT0 except for frangible objects, which, because of
their function, must be located thereon.
3.3.5 Objects whose function require them to be located
on the edge of the FAT0 shall not exceed a height of 25 cm.
3.3.6 The surface of the FAT0 shall be skid-resistant to
both helicopters and persons and be sloped to prevent pooling
of liquids. Where the helideck is constructed in the form of a
grating, the underdeck design shall be such that ground effect
is not reduced.
Note.- Guidance on rendering the sulface of the FAT0
skid-resistant is contained in the Heliport Manual.
3.4 Shipboard heliports
3.4.1 When helicopter operating areas are provided in the
bow or stern of a ship or are purpose-built above the ship's
structure, they shall be regarded as helidecks and the criteria
given in 3.3 shall apply.
Final approach and take-off area and
touchdown and lijl-off area
Note.- On heliports located in other areas of ships it is
pres~tmed that the FAT0 and the touchdown and lift-off area
will be coincidental. Guidance on the effects of airflow
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