离岸直升机起落甲板设计指南 OFFSHORE HELIDECK DESIGN GUIDELINES 1(41)

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Where hinge systems are fitted and they protrude above surface level they should be clearly marked with ‘rectangles’ of painted yellow / black stripes. Protruding hinges may significantly effect the operability of the helideck.
7.4.3.3  Combined Perimeter Safety Nets / Handrailing
Combined perimeter safety nets / handrailing are a common feature on specialist ships such as seismic vessels.  The performance of these systems may often fall short both as a secure perimeter safety net and as handrailing.
Section 9.10 covers, in more detail, the design and construction considerations for perimeter safety nets.
7.4.3.4 Fore Masts
At sea it is a maritime requirement for a vessel to have a foremast (e.g. to display running lights).
Where a helideck is designed as an integral part of the foredeck structure the foremast will pose an obstruction to helicopter operations. Therefore, retractable foremasts are fitted to overcome this problem.
Where a retractable foremast has been specified it is essential to consider and mitigate the following:
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The location of the assembly (when stowed) relative to the safe landing area

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The size and extent of the surface obstruction and potential structural ‘soft spot’ to be avoided by a landing helicopter

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Requirements for designation as a ‘restricted sector’ which requires

marking in accordance with CAP 437.
7.5 MOTION CONSIDERATIONS AND OPERATING LIMITS
All floating structures will encounter motions at the helideck as a result of a vessel’s natural movement whilst afloat.
The effects of any helideck motions (roll, pitch, heave, yaw, surge and sway) have a direct impact on a helicopter flight crew’s ability to make a safe landing and take-off from vessel helidecks. Additionally, when stationary on a moving helideck, a helicopter is constantly subjected to complex dynamic forces (accelerations) that will have a direct effect on its stability, particularly when the rotors are turning.  
The effects of these forces on a helicopter can cause sliding and / or tipping which, if excessive, may cause the helicopter to overturn.  Therefore, helideck motion effects and their potential amplitudes should be calculated during the design process and safe operating parameters established.
The limits of safe helideck performance should be fully accounted for during operations.
See Section 10 for further details.
8.0  OTHER INSTALLATION ARRANGEMENTS
8.1  COMBINED OPERATIONS
8.1.1  Introduction
Combined operations can take several different forms. Essentially, they are a situation offshore where there are two or more installations / vessels working alongside each other.  Generally this will mean that, to some extent, the operational clearances and aerodynamics of the helidecks on each of the installations / vessels may be impeded in some way by positioning the additional structures alongside.  In turn, this means that specific considerations have to be taken into account during helicopter operations.
　
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