The crane/derrick is prevented from shifting by being mounted to a wire rope system. The employer must ensure that the wire rope system meets the following requirements:
The wire rope and attachments are of sufficient size and strength to support the side load of crane/derrick.
The wire rope is attached physically to the vessel/flotation device.
The wire rope is attached to the crane/derrick by appropriate attachment methods (such as shackles or sheaves) on the undercarriage, and that the method used will allow the crew to secure the crane/derrick from movement during operation and to move the crane/derrick longitudinally along the vessel/flotation device for repositioning.
Means are installed to prevent the crane/derrick from passing the forward or aft end of the wire rope attachments.
The crane/derrick is secured from movement during operation.