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the area, but shall not exceed 2 per cent in any direction.
3.1.21 The surface of the safety area abutting the FAT0
3.1.13 A touchdown and lift-off area shall be capable of shall be continuous with the FAT0 and be capable of
withstanding the traffic of helicopters that the area is intended supporting, without structural damage, the helicopters that the
to serve. heliport is intended to serve.
Safety areas
3.1.14 A FAT0 shall be surrounded by a safety area.
3.1.15 A safety area surrounding a FAT0 intended to be
used in visual meteorological conditions (VMC) 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 the area is intended to
serve.
3.1.16 A safety area surrounding a FAT0 intended to be
used by helicopter operations in instrument meteorological
conditions (IMC) shall extend:
Helicopter ground laxiways
Note.- A helicopter ground taxiway is intended to permit
the su$ace movement of a wheeled helicopter under its own
power. The specifications for taxiways, tariway shoulders and
taxiway strips included in Annex 14, Volume 1 are equally
applicable to heliports as modified below. When a taxiway is
intended for use by aeroplanes and helicopters, the provisions
for taxiways and helicopter ground taxiways will be examined
and the more stringent requirements will be applied.
3.1.22 The width of a helicopter ground taxiway shall not
be less than:
a) laterally to a distance of at least 45 m on each side of the
centre line; and Helicopter main gear span
Helicopter ground
taxiway width
b) longitudinally to a distance of at least 60 rn beyond the
ends of the FATO.
Up to but not including 4.5 m 7.5 m
4.5 m up to but not including'6 m 10.5 m
Note.- See Figure 3-1.
6 m up to but not including 10 m 15 m
3.1.17 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.
3.1.18 Objects whose functions 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
FAT0 at a gradient of 5 per cent.
3.1.19 The surface of the safety area shall not exceed an
upward slope of 4 per cent outwards from the edge of the
FATO.
I0 m and over 20 m
3.1.23 The separation distance between a helicopter
ground taxiway and another helicopter ground taxiway, an air
taxiway, an object or helicopter stand shall not be less than the
appropriate dimension specified in Table 3- 1.
3.1.24 The longitudinal slope of a helicopter ground
taxiway shall not exceed 3 per cent.
3.1.25 Recommendation.-- A helicopter ground taxiway
should be capable of withstanding the traffic of helicopters
that the helicopter ground taxiway is intended to serve.
- I 1
I Safety area
I
-60 m - I I
I FAT0
Helicopter clearway Rejected take-off area
I I
I
I
I
I
I
Figure 3-1. Safety area for instrument FAT0
6
Chapter 3 Annex 14 -Aerodromes
3.1.26 Recommendation.- A helicopter krourad taxiway
should be provided with shoulders which extend synzmetrically
on each side o f the helicopter ground taxiway for at least onehalf
the greatest over-all width of the helicopters that the
helicopler ground taxiway is intended to serve.
3.1.27 The helicopter ground taxiway and its shoulder
shall provide rapid drainage but the helicopter ground taxiway
transverse slope shall not exceed 2 per cent.
3.1.28 Recommendation.- The suguce of a helicopter
ground taxiway shoulder should be resistant to the effect of
rotor downwash.
Air taxiways
Note.- An air taxiway is intended to permit the movement
of a helicopter above the surface at a height normally
associated with ground effect and at groundspeed less than
37 km/h (20 kt).
3.1.29 The width of an air taxiway shall be at least two
times the greatest over-all width of the helicopters that the air
taxiway is intended to serve.
3.1.30 The surface of an air taxiway shall:
a) be resistant to the effects of rotor downwash; and
b) be suitable for emergency landings.
3.1.31 Recommendation.- The su$ace of an air
taxiway should provide ground effect.
3.1.32 Recommendation.- The transverse slope of the
su8ace of an air taxiway should not exceed I0 per cent and
　
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