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1. General project requirements

120 m Multipurpose Subsea Explorer for world-wide operation. In addition the Vessel will have the capability to take part in special offshore operations. Two decks are dedicated for “superyacht” features. Other decks “normal” ship standard. Passengers: 36 Crew: 64

2. Helicopter requirements for the project

Helicopter landing D14m forward and D23m aft of bridge. Moving of helicopter into a hangar. Helicopter areas to be certified for commercial use.

3. Rules for helicopter landing areas physical characteristics

International Civil Aviation Organization (ICAO), Annex 14, Volume II, Heliports - standards and recommended practices covering aspects of heliport planning, design and

operations

CAP 437, Standards for Offshore Helicopter Landing Areas - for UK registered helicopters, recognized also as international standard/reference material,

based on ICAO, Annex 14, Vol II

LY3, the Maritime and Coastguard Agency’s Large Commercial Yacht Code, max 12 pass. - comparable rules as CAP 437

PYC, the Code of Practice for Yachts, 13 to 36 passengers - comparable rules as CAP 437, without requirements for obstacle free areas below (figure 2,

page 2)

DNV - reference to CAP 437

Lloyd’s Register - reference to applicable regulations, international standards

Figure 4-2. Helideck obstacle free sector in ICAO Annex 14, vol II

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Figure 4-3. Helideck obstacle limitation sectors in ICAO annex 14, Vol II

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Figure 4-9. Midship non-purpose-built heliport obstacle limitation surfaces, ICAO Annex 14, Vol II

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4. D 23 m helideck aft of bridge

Helicopter landing indicated on the very preliminary concept proposal.

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Aft 23 m helideck remarks/conclusion: - limited obstacle sector in conflict with deckhouse, impacts on deckhouse design - landing area to be larger astern

5. D 14 m helideck forward of bridge

Helicopter landing indicated on the very preliminary concept proposal.

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Fore D 14 m helideck remarks/conclusion: - possible with wider deck or foldable solution - limited obstacle sector in conflict with deckhouse, impact on deckhouse/bow design

6. D 14 m helideck aft of bridge, midship non-purpose-built heliport

Helicopter landing indicated on the very preliminary concept proposal.

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! Aft 14 m midship non-purpose-built heliport remarks/conclusion: - limited obstacle sector in conflict with deckhouse, impacts on deckhouse design - no requirements for obstacle free area below helideck

7. D 23 m helideck forward of bridge

Helicopter landing indicated on the very preliminary concept proposal.

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! Fore D 23 m helideck remarks/conclusion: - elevated helideck needed - limited obstacle sector in conflict with deckhouse, impact on deckhouse/bow design

8. Helicopter Fuelling Facilities

We assume that helicopter fuelling facilities will be required

System elements: - fuel storage tank, located in a designated area as remote as practicable from machinery and

accommodation spaces - pumping/filtration unit - fuelling hoses - fire fighting system to protect helicopter operations

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9. Polar code requirements for helicopter landing areas

Elomatic did not find any requirements.

10. Notes/questions

- max. weight for D23 helicopter ab.15000 kg, heavy superstructures needed below helidecks - moving helicopter to hangar with crane? To be studied.

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11. Miscellaneous helideck examples

Acergy Viking, Helideck D 21 m, Design for Sikorsky S-92 (13t):

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Viking Neptun, Salt 301 OSV, 145,6 m, Helideck D 21 m:

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Vard 3 07 Offshore Subsea Construction Vessel, 132,8 m:

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Support vessel with aft helideck:

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Extractable helideck on yacht:

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Helihangar by Damen/Amels:

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Hangar without folding the rotor blades, Bray Yacht Design and Research:

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The SEA BULL 65m is designed to host a helicopter in its own helicopter hangar:

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Ilona Superyacht helipad to Agusta 109 Grand New by Amels:

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