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Accurate sighting of the floodlight(s) is required to ensure that the structure is properly highlighted and that light ‘overspill’ that may affect pilot night vision is avoided. Before proceeding with this alternate arrangement, it is prudent to consult with the CAA / BHAB Helidecks and to advise them of the design intent.
Vertical Gas Turbine exhaust support structures should also be fitted with obstruction lights to give an indication to the flight crews of the origin of the heat source.
Obstruction lights should be specified to provide an omni-directional light that is clearly visible to an approaching helicopter.
Where there is significant light pollution from the installation / vessel general areas that may reduce the overall visual effects of obstruction lighting, it may be prudent to select higher-powered units.
It is preferable to specify either dual filament light units or install the lights in pairs. This should ensure that the installation / vessel is not rendered non-compliant for helicopter operations at night or in low visibility conditions as a result of a filament failure in a single light unit.
Irrespective of the type of obstruction lighting selected, it should be specified with enclosures consistent with the hazardous area classification for the area in which it is to be located.
11.3.7.3 Power Supply and Control
Power supplies to the obstruction lights should be connected to the emergency switchboard and ideally, to ensure the lights switch on automatically in low light conditions, they should operate via a PIR.
11.3.8 Windsock Lighting
11.3.8.1 Objective
The windsock(s) should be illuminated with white floodlighting (without impairing pilots vision) where the helideck is to be used at night or in weather conditions where visibility is less than 1500 metres.
Internally illuminated windsocks are available and these are the preferred lighting option.
(Photograph courtesy of Orga BV)
Externally illuminated windsocks provide equally good lighting but tend to be more vulnerable to damage. In both cases the arrangement for elevating the windsock above helideck level should be designed to allow the windsock assembly to be safely lowered for routine maintenance, filament and sock replacement. See also Section 11.9.4 for details about the Windsock structure and its location.
In some instances (e.g. due to its location and the available electrical power supplies), it may be considered desirable to illuminate a windsock from a remote light source. For this type of arrangement to be acceptable it should be clearly demonstrated that there is an overriding need to illuminate with a remote light source(s) and that the lighting is both effective and does not impair pilot night vision.
11.3.9 Status Lights
11.3.9.1 Main References
CAP 437, Section 4.3.
CAA Paper 98003 [Ref: 46] Note this will be superseded by CAA paper 2003/6.
CAA Status Light Interim Guidance (Letter dated 31 December 2002) [Ref: 48]
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