13.2.1 The helicopter deck should be of a design
and construction adequate for the intended service to the satisfaction
of the Administration.
13.2.2
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.1
footnote In general,
the helicopter deck should be of sufficient size to contain a circle
of a diameter equal to at least the rotor diameter of the largest
helicopter intended to use the facility. The helicopter deck should
have an approach/departure sector of at least 180° free of obstructions.
The base of this sector should be tangent to the periphery of the
circle described above as shown in figure 2. Outside the approach/departure
sector, obstructions within one third of the rotor diameter from the
periphery of the circle described above should not extend above a
plane measured vertically from the edge of the deck with a rise equal
to half of the horizontal distance from the periphery of the above
circle.
-
.2
footnote Where adverse
climatic conditions are prevalent, as in the North Sea, a coastal
State may, for units operating in its territorial sea or on its continental
shelf, specify a helicopter deck of sufficient size to contain a circle
of a diameter equal to at least the overall length of the largest
helicopter intended to use tile facility. The approach/departure sector
should be not less than 210° free of obstruction and should intersect
the periphery of the circle described above as shown in figure 2.
Outside the approach/departure sector, obstructions within one third
of the helicopter overall length from the periphery of the circle
described above should not extend more than 1/20 of the helicopter
overall length above the level of the helicopter deck. The overall
length of a helicopter is the distance from the tip of the main rotor
blade to the tip of the tail rotor when the rotor blades are aligned
along the longitudinal axis of the helicopter.
13.2.3 The helicopter deck should have a non-skid
surface.
13.2.4 The helicopter deck should have drainage
facilities to prevent the collection of liquids and prevent liquids
from spreading to or falling on other parts of the unit having regard
to the use of fire-fighting equipment and the possible spillage of
fuel.