At the very bottom for instance "Orig 15Jan09" So this means the plate originated Jan 15, of 2009. Similarly you'll see "Amdt 9D 05JUN08" - so chart was amended June 5 of 2008? Is that right? Can you assume no changes have been made to the approach plate since the dates at that bottom margin then?
Also, is there somewhere on FAA's site where they track changes to any approach so you can see what has been changed or amended on an approach plate, and when?
Technically the plate is expired if the dates is past on the left and right margin, the effective dates, but that doesn't mean anything has changed. Anyone cast more light on this?