- Steel support frame connected to the superstructure deck and supporting the helideck aluminium structure
- Type of helicopter: EH101 or S61N, maximum Take off weight (EH101): 14600 kg – (143t)
- Helideck size : D = 22.8m
- Helideck shape: Octagonal
- Detailed design of steel structure.
- Detail design of the drainage system and fire water system.