13.2 Definitions

Clasification Society 2024 - Version 9.40

Statutory Documents - IMO Publications and Documents - International Codes - 1989 MODU Code – Code for the Construction and Equipment of Mobile Offshore Drilling Units, 1989 – Resolution A.649(16) - Chapter 13 – Helicopter Facilities1 - 13.2 Definitions

13.2 Definitions

13.2.1 'Helideck' is a purpose-built helicopter landing platform located on a mobile offshore drilling unit (MODU).

13.2.2 'RD' means the main rotor diameter of the largest single rotor helicopter intended to use the facility.

13.2.3 'LD' means the largest dimension of the helicopter when the rotors are turning.

13.2.4 'Obstacle-free sector' is a sector formed by an arc originating at the reference point of the edge of a helideck and extending outward in the horizontal plane level with the elevation of the helideck.

13.2.5 'Limited obstacle sector' is a sector extending outward which is formed by that portion of the 360° arc, excluding the obstacle-free sector, the centre of which is the reference point from which the obstacle-free sector is determined. Obstacles within the limited obstacle sector are limited to specified heights.

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