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4. Booms (1) + (2) + (3) + (4): With booms (2) and (3) fully extended, booms (4) and (5) are in
a state of intermediate extension, where half of the “
mark” is exposed from boom (3).
If booms (4) and (5) are extended to some extent even only slightly, work should be
performed in accordance with the performance of this column.
5. Booms (1) + (2) + (3) + (4) + (5): All the main booms extended fully.
If more than half of the “
mark” of boom (4) is exposed from boom (3), work should be
performed in accordance with the performance of this column.
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