离岸直升机起落甲板设计指南 OFFSHORE HELIDECK DESIGN GUIDELINES 1(28)

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Where the overall size of the helideck structure can be made larger than the SLA the designer is strongly recommended to take full advantage of any extra space that is available to maximise separation of the SLA from any adjacent structures and possibly to create a ‘run-off’ (parking) area.
Helideck enlargement is particularly important on vessels with forward mounted helidecks where any additional space gained to create more forward visual cues for landing is a highly desirable feature.  
Where helideck space is limited and the windflow is over the bow, the helicopter will land on the helideck with its tail rotor towards the Limited Obstacle Sector (e.g.
vessel superstructure) and the flight crew will be unable to see the helideck surface in front of the nose of the helicopter.
Therefore, with more space behind the helicopter and thus, the provision of greater separation, there is less likelihood for an inadvertent tail rotor strike.  This topic is covered in more detail in Section 7.

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6.5  HELICOPTER PARKING FACILITIES
6.5.1  Introduction
In certain instances, helicopters visiting offshore installations may become unserviceable and have to shutdown. A helicopter transiting the general area offshore may have an in-flight emergency and be seeking an offshore diversion.  
Therefore, there may be good operational reasons for wanting to park a helicopter on a helideck but still be able to allow other helicopters to use the safe landing area (SLA).
The ability to park a helicopter on an offshore installation and still be able to use the helideck for other helicopter movements gives much greater operational flexibility. For this reason a parking or ‘run-off’ area should be seriously considered at the outset of conceptual installation / helideck design.
Factors that may assist with decision-making on the benefit of providing a parking area are:
.  
The type of facility being designed (i.e. a small vessel or NUI may not be able to accommodate a parking area)

.
There may only be limited structural capacity and space options with the

intended installation design and layout

.  
Capital cost implications may outweigh the potential operational advantages of having a parking area

.  
Provision of one helideck with a parking area when operating several helidecks within an oil / gas field.

6.5.2  Main References
CAP 437, Chapter 3.
6.5.3  Design Considerations
A parking area should be regarded as an integral part of the helideck layout regardless of whether it is adjacent to the SLA or located some distance away with ready made access to and from the SLA.
The parking area size, dimensions and layout will be entirely dependent upon the space that can be made available. Also, there is a need to ensure that:
1.  
A parked helicopter does not infringe the obstacle protected surfaces for the helicopter landing area (e.g. create an unacceptable obstacle environment for the helideck).
　
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