A prescribed mine's operator must test every risk control measure documented under r 418(3)(d) for major mining hazards as often as needed to ensure the controls meet r 405 for those hazards. No fixed interval is set; the test frequency is driven by what r 405 compliance requires. Its Act compliance note (r 7) ties it to sections 21, 23 and 26 of the Act: it sets how those duties are performed for major mining hazards.
The graph holds this control, the 0 it maps to, and the evidence behind each claim, over MCP and REST.