离岸直升机起落甲板设计指南 OFFSHORE HELIDECK DESIGN GUIDELINES 1(21)

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2. Aircraft Operating and Performance Considerations
Data relevant to helicopter types that may use the helideck, For example, motion limits imposed on FPSOs, MODUs and vessels.
3. Helicopter Landing Area Operational Standards
Information provided should include the landing area height (vessels should include variations to draught conditions AMSL), wind direction, frequency and velocity distribution, vessel motions affecting helicopter operations including a motion analysis (when applicable).
4. Helicopter Landing Area Physical Characteristics
This section should address the following list of topics and should clearly demonstrate that each element has been properly considered during the design phase. It is essential that any reduction or infringement of the dimensional or obstruction clearance requirements set out in CAP 437 is highlighted and full justification given for the anticipated operating limitations.  Similarly where the requirements are exceeded these should also be stated.
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Helicopter Safe Landing Area size

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Overall helideck size (if larger than the basic safe landing area)

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210° Obstacle Free Sector

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0.12 ‘D’ Limited Obstacle Sector (0.62 'D' from centre of D circle)

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0.21 ‘D’ Limited Obstacle Sector (0.83 'D' from centre of D circle)

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5:1 Falling Gradient 

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The adverse effects of combined operations on clearances (if applicable) 

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Helideck and landing area design, materials, airgap, etc.

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Helideck friction surface / helideck net

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Helicopter tiedown points arrangement, fittings, etc. 

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Perimeter Safety Net

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Access and Escape arrangements

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Routine or emergency parking and laydown arrangements (drawings to be provided showing locations and revised obstruction clearances)

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Helideck drainage.

5. Aerodynamic and Process Thermal Effects on the Helideck and Helicopters
This is a key section that deals with providing good information for flight crews on the likely adverse flying effects (aircraft handling difficulties and pilot workload) they may encounter from turbulence over the helideck and around the installation / vessel environs during approach, landing and take-off.  Potential turbulence (from structures, etc.) and thermal sources (from gas turbines, diesel exhausts, process vents and flares, etc) that are identified during model testing (using physical or CFD methods) should be quantified and fully explained.  Estimates of helideck operability should be provided and conclusions drawn in respect of flight safety and the potential for additional operating costs if accepting helideck operational impairment and landing limitations [Ref: 68].
6. Visual Aids
It should be demonstrated that helideck and obstruction markings fully meet CAP 437 requirements. Any deviation must be justified and accepted by a competent agency.
　
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