4.
Consult competent aviation specialists, the aviation or logistics staff of the Owner or Operator, the CAA, BHAB Helidecks and helicopter operators as necessary.
6.3.3 Helideck Physical Characteristics
The helideck structure should be designed to accommodate a safe landing area (‘D’ circle) suitable for the largest and heaviest helicopter that it is anticipated will use the helideck. The operator or owners’ project and logistics staff should provide this information.
This information is fundamental in any helideck design and will enable designers to determine the minimum overall size of the helideck and safe landing area and the required load bearing strength of the structure. The Safe Landing Area (SLA) is the actual area on a helideck enclosed and delineated by the Perimeter Line marking. ‘D’ is the imaginary circle described on drawings to establish the SLA dimensions and clearances for a selected helicopter (See CAP 437).
The operational needs of the installation, MODU or vessel and the helicopter crews, helideck crews and passengers should also be taken fully into account. To do this, it is prudent for the designer to explore potential opportunities for enlarging the shape of the helideck beyond the minimum safe landing area requirement. This obviously needs to be done whilst keeping in mind the ultimate weight, size, structural loadings and economics of the final structure.
When selecting and fixing the final helideck size, shape and configuration, the following factors should be properly considered and mitigated:
.
The safe landing area (SLA) should be positioned for optimum operational efficiency and clearance from obstructions (See Section 6.4). Also, the SLA should be positioned toward an appropriate outboard edge of the main structure so that overflying installation structures is avoided, and there are adequate clear landing and take-off sectors available
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Safe passenger access to and egress from a helicopter in both normal and emergency situations in all weather conditions
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Safely performing routine helideck crew activities such as refuelling, freight and baggage handling, fire fighting and rescue, and maintenance requirements
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The need to provide a parking area for an unserviceable helicopter to make the landing area available for a ‘recovery’ aircraft should be seriously considered. This facility may be operationally desirable where alternate landing sites / arrangements cannot be easily obtained.
Doing this exercise properly will help to determine the overall helideck dimensions that are required, over and above the safe landing area.
Simple examples for developing helideck configurations are given in Section 6.6 and a selection of actual helideck arrangements is illustrated in the following plates.
The actual helideck arrangements shown are not necessarily optimum helideck designs without any operating restrictions.
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