I don't get that either. The revision was dated July, but the effective date was last October. I would never have even known about it until next June 15th which is when my annual is and that's when I check to make sure I have the latest revision. I am in Canada and have gotten conflicting information as to whether they are mandatory so I have asked Ottawa directly (Transport Canada Headquarters). A fellow pilot did ask earlier in the year and was told he did NOT have to do them so the answer should be the same. I hope
