Rigger Basic ADC Practice Test

This tests how the mast’s position relative to a structure affects stability and load transfer when tying in. Erecting the mast-in configuration places the mast inside the structure’s footprint, so the tie-ins to the building are short and direct. That creates a stiffer, more predictable load path for horizontal forces from wind, movement, or climbing actions, keeping the load transfer concentrated into the structure and reducing bending moments on the base. It also helps maintain proper alignment with the structure as you operate. If you did mast-out, the mast would sit away from the structure, relying on longer tie-backs. Those longer ties act more like levers, increasing lateral loads on the base and making the system more prone to sway and instability. For a safer, more stable tie-in to a nearby structure, mast-in is the preferred approach.