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direction and turbulen,ce, prevailing wind velocity and high
temperature from gas turbine exhausts or flare radiated heat
on the location of the FAT0 is given in the Heliport Manual.
3.4.2 Shipboard heliports shall be provided with at least
one FATO.
3.4.3 A FAT0 on a shipboard heliport shall be circular
and shall be of sufficient size to contain a diameter not less
than 1.0 times D of the largest helicopter the heliport is
intended to serve where D is the largest dimension of the
helicopter when the rotors are turning.
3.4.4 The surface of the FATO shall be skid-resistant to
both helicopters and persons.
CHAPTER 4. OBSTACLE RESTFUCTION AND REMOVAL
Note.- The objectives of the specifications in this chapter
are to define the airspace around heliports to be maintained
free from obstacles so as to pennit the intended helicopter
operations at the heliports to be conducted safely and to
prevent the heliports becoming unusable by the growth of
obstacles around them. This is achieved by establishing a
series of obstacle limitation suty?aces that define the limits to
which objects may project into the airspace.
4.1 Obstacle limitation surfaces and sectors
Approach surface
4.1.1 Description. An inclined plane or a combination of
planes sloping upwards from the end of the safety area and
centred on a line passing through the centre of the FATO.
Note.- See Figure 4- J .
4.1.2 Characteristics. The limits of an approach surface
shall comprise:
a) an inner edge horizontal and equal in length to the
minimum specified width of the FAT0 plus the safety
area, perpendicular to the centre line of the approach
surface and located at the outer edge of the safety area;
b) two side edges originating at the ends of the inner edge
and:
I) for other than a precision approach FATO, diverging
unifomly at a specified rate from the vertical plane
containing the centre line of the FATO,
2) for a precision approach FATO, diverging uniformly
at a specified rate from the vertical plane containing
the centre line of the FATO, to a specified height
above FATO, and then diverging uniformly at a
specified rate to a specified final width and
continuing thereafter at that width for the remaining
length of the approach surface; and
c) an outer edge horizontal and perpendicular to the centre
line of the approach surface and at a specified height
above the elevation of the FATO.
4.1.3 The elevation of the inner edge shall be the
elevation of the safety area at the point on the inner edge that
is intersected by the centre line of the approach surface.
4.1.4 The slope(s) of the approach surface shall be
measured in the ver~icapl lane containing the centre line of the
surface.
Note.- For heliports used by performance chss 2 and 3
helicopters, it is intended that approach paths be selected so
as to permit safe forced landing or one-engine-inoperative
landings such that, as a minimum requirement, injury to
persons on the ground or water or dnmage to property are
minimized. Provisions for forced landing areas are expected to
minimize risk of injury to the occupants of the helicopter. The
most critical helicopter type for which the heliport is intended
and the ambien,t conditions will be factors in determining the
suitability of such areas.
Transitional surface
4.1.5 Description. A complex surface along the side of
the safety area and part of the side of the approach surface,
that slopes upwards and outwards to the inner horizontal
surface or a predetermined height.
Note.- See Figure 4-1.
4.1.6 Characteristics. The limits of a transitional surface
shall comprise:
a) a lower edge beginning at the intersection of the side of
the approach surface with the inner horizontal surface,
or beginning at a specified height above the lower edge
when an inner horizontal surface is not provided, and
extending down the side of the approach surface to the
inner edge of the approach surface and from there along
the length of the side of the safety area parallel to the
centre line of the FATO: and
b) an upper edge located in the plane of the inner
horizontal surface, or at a specified height above the
lower edge when an inner horizontal surface is not
provided.
4.1.7 The elevation of a point on the lower edge shall be:
a) along the side of the approach surface - equal to the
elevation of the approach surface at that point; and
b) along the safety area - equal to the elevation of the
centre line of the FAT0 opposite that point.
Note.- As a result of b) the transitional suty?ace along the
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