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When using these light fittings it is important to ensure that the construction is sufficiently robust for helideck applications (e.g. environmental effects) and they can withstand the weight and abrasive effects of anticipated traffic. Suitable power supplies and enclosure rating should also be fully considered.
A technical specification for ELP lighting is given in ICAO Annex 14 Volume 2.
11.3.4.4 Light Emitting Diode (LED) Systems
A recent innovation when designing helideck lighting is the use of LED technology.
Recent lighting trials during a CAA Research Project have established that this technology is probably superior to ELP panels because it provides clearer visual signals and has potentially longer operating life.
The proposed future use of these systems for illuminating the 'H' and aiming circle awaits the development of practical equipment.
11.3.4.5 Lighting Layout
Spacing of the lighting units should, as far as reasonable practicable, be equidistant. To achieve a regular pattern it is preferred that more light units are added and the maximum spacing be slightly reduced.
In the case of helidecks where the perimeter lights delineate a safe landing area that is less than the overall size of the helideck surface (e.g. there is passenger walkway, a parking or run-off area), semi-recessed fittings or ‘ELP lights’ may be considered more appropriate. Placing this type of fitting across that section of the helideck where personnel and aircraft movements may take place will present less obstructions and trip hazards.
11.3.4.6 Power Supply and Control
There is considerable merit in designing the supply system for perimeter lighting to operate from two separate power circuits. Alternate lights should be supplied from different power supplies. This has the effect of at least providing half the perimeter lighting if there is a malfunction circuit in one of the electrical supplies.
Control of the perimeter lighting should be from a location convenient to the Helideck / HLO office. It may also be beneficial to have the lighting activated by ‘low light’ conditions using an appropriately designed PIR system.
If the helideck and / or installation is in an unsafe condition (i.e. not fit for helicopter operations), the helideck lighting system should be switched off.
11.3.5 Floodlighting
11.3.5.1 Objective
The objective with floodlighting on offshore helidecks is to provide flight crews with good visual cues during the approach and landing phase and to eliminate any ‘black hole’ visual effects in the safe landing area. At night and in low light conditions the floodlighting also provides a safer work environment for helideck crews and for passenger movements.
NOTE: During helideck lighting field trials, as part of a recent CAA research project, it has been noted that by making use of combinations of modern lighting systems (LEDs and ELPs) for the helideck markings and using green perimeter lights, good light levels and visual cues can be achieved with reduced use of low level floodlighting.
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离岸直升机起落甲板设计指南 OFFSHORE HELIDECK DESIGN GUIDELINES 2(40)
