I guess it comes back to what I think David was trying to bring out as far as inspections. If you take a look at a full assessment of a safety management system, that happens roughly every three years. I think if you look back, though, the old national audit in the pre-SMS days was only, I believe, once every five years, and my counterparts can chime in.
On June 3rd, 2014. See this statement in context.