2.1
D-value means the largest dimension
of the helicopter used for assessment of the helideck when its rotors
are turning. It establishes the required area of foam application.
2.2
Deck integrated foam nozzles are
foam nozzles recessed into or edge mounted on the helideck.
2.3
Foam-making branch pipes are
air-aspirating nozzles in tube shape for producing and discharging
foam, usually in straight stream only.
2.4
Helicopter landing area is an
area on a ship designated for occasional or emergency landing of helicopters,
for example as referred to in SOLAS regulation II-2/18.2.2 and not
designed for routine helicopter operations.
2.5
Helideck is a purpose-built helicopter
landing platform or other deck area including all structure, fire-fighting
appliances and other equipment necessary for the safe operation of
helicopters, as referred to in SOLAS regulations
II-2/3.26 and 18.5 and
the 2009 MODU Code (chapter 1, paragraph
1.3.27).
2.6
Hose reel foam station is a hose
reel fitted with a foam-making branch pipe and non-collapsible hose,
together with fixed foam proportioner and fixed foam concentrate tank,
mounted on a common frame.
2.7
Monitor foam station is a foam
monitor, either self-inducing, or together with separate fixed foam
proportioner, and fixed foam concentrate tank, mounted on a common
frame.
2.8
Obstacle free sector is the take-off
and approach sector which totally encompasses the safe landing area
and extends over a sector of at least 210º, within which only
specified obstacles are permitted.
2.9
Limited obstacle sector is a
150º sector outside the take-off and approach sector that extends
outward from a helideck where objects of limited height are permitted.
2.10
Winching area is a pick-up area
provided for the transfer by helicopter of personnel or stores to
or from the ship, while the helicopter hovers above the deck, for
example as referred to in SOLAS regulation
III/28.