这些地区大部分是近一个入口，或在天井或甲板边缘了。
Most of these areas are near an entrance, or at the edge of a patio or deck.
无障碍区域是由一个起于直升机甲板边缘的基准点并在直升机甲板的水平面向外延伸的弧形所形成的区域。
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.
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