I think what we'll do with that question.... It would be important to understand the process that's undertaken with regard to concern papers, which are actually very common practice and are used for validating authorities to identify areas that they seek further information on from the certifying authority.
I'll turn it over to my colleague, Dave Turnbull, to take you through the concern paper process, and as you mentioned the first edition, how that concern paper specifically evolved through the process that we had with the FAA and Boeing.