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Floodlighting of the structure, especially below the helideck should be seriously considered. The purpose of this floodlighting is to provide flight crews with good visual cues and to avoid the ‘floating in space’ effect often experienced at night when approaching NUIs for landing.
Providing the NUI is in a condition which is safe to accept helicopter movements, the perimeter lighting and floodlighting MAY remain on. The system may be controlled via a light sensitive switch with a manual override operable locally, or from an appropriate manned installation or shore base.
11.3.4 Perimeter Lighting
11.3.4.1 Objective
The primary objective of perimeter marking and lighting is to delineate the limit of the SAFE LANDING AREA particularly on the Limited Obstacle Sector side of the helideck. A helicopter should be able to land within this area with adequate clearance from any obstruction on the Limited Obstacle Sector side of the deck.
11.3.4.2 Equipment Specification
To comply with the latest edition of CAP 437, perimeter lighting should not exceed 250 mm overall height above deck level and should exhibit yellow lights of 25 candelas or above at maximum three metre spacing. A full technical specification is given in ICAO Annex 14 Volume 2 (Note: CAA is in the process of proposing amendments to the current specification).
Over the years, several types of light fitting have been used for perimeter lighting, some poor and others adequate. In recent years more specialised equipment has become available. Therefore, designers are now able to specify ‘fit for purpose’ units that will comply with CAP 437 and will be robust, reliable, have extended life tubes / filaments and be relatively maintenance free.
When required, perimeter light fittings suitable for use in hazardous atmospheres (Zone 1 and 2) are obtainable with IP Rated enclosures suitable for immersion in seawater (e.g. spray on vessel helidecks and fire monitor discharges).
Perimeter lights can be obtained for surface fixing or semi-recessed applications.
Where perimeter lights are used on helidecks that are likely to suffer from guano accumulations (e.g. NUIs), they can often be fitted with low profile ‘bird spikes’ to deter seabirds from roosting on them.
(Photograph courtesy of Orga BV)
(Photograph courtesy of John Burt Associates Limited)
11.3.4.3 Electroluminescent Lighting Panels (ELP)
Electroluminescent lighting panels (ELP) offer another option for helideck lighting.
These lighting panels are more suited to those applications where it is necessary to delineate the inner extent of the safe landing area on large helidecks with parking areas and where a surface mounted arrangement is the preferred structural option.
(Photograph courtesy of QinetiQ)
Figure 11.5 – Electroluminescent (ELP) Lighting Panel
These panels have recently been demonstrated during a CAA Research Project lighting trial to provide a very effective illuminated ‘H’. In the future, such enhancements to offshore helideck lighting may become a requirement.
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