Here is a Picture of the Second Chance Line Restraint in use. Either end is tied off in the simple but effective way to use the strap. If the operator were to boom up or out without slacking the lines damage would occur to the crane creating a very unsafe situation. The Second Chance Line Restraint in this situation would react with an obvious warning and would contain the rigging.
This is what the Second Chance Line Restraint looks like when not in use. You can see where each end has a specific place to tie off. One eye is larger and is attached to the live end and the smaller eye is fastened to the super structure.
The final picture is an example of the expended and used Second Chance Line Restraint. At this point the device has ripped and restrained the lines, preventing the line snapping, and possibly causing property damage, injury or death.