13.4.1 The helideck should be free of projections
except that landing lights or other essential projections may be installed
around the periphery of the deck provided they do not rise more than
0.15 m above the level of the deck.
13.4.2 The helideck should have recessed tie-down
points for securing a helicopter.
13.4.3 The periphery of the helideck should be
fitted with a safety net except where structural protection exists.
The net should be inclined upward and outwards from below the edge
of the helideck to a horizontal distance of 1.5 m and should not rise
more than 0.15 m above the edge of the deck.
13.4.4 The helideck should have both a main and
an emergency personnel access route located as far apart from each
other as practicable.
13.4.5 Reference should be made to 9.11.1 concerning
helideck drainage.