It's always 6 months except when it isn't. Exceptions are the Grand Canyon and maybe some non-ConUS. But, since the ConUS challenge doesn't recognize those others anyway,....
Here ya go. Here's a list that spells out all the expiration dates. This is the one I was thinking of earlier but couldn't find it immediately.
It's always 6 months except when it isn't. Exceptions are the Grand Canyon and maybe some non-ConUS. But, since the ConUS challenge doesn't recognize those others anyway,....
Check the back of the AF/D for a list of the changes. There are probably lots of new towers that you don't notice. Ind I guess it might be more accurate to say it's "about" every six months. Close enough for government work!
And a new [FONT=Verdana, Arial, Helvetica] ALBUQUERQUE came out within the past 30 days (indicated by the "new" on the link I posted). It won't be effective until 5/9, which is when the CHICAGO one is effective, too. The one posted on skyvector for ABQ is valid Oct 25 2007 to May 8 2008.[/FONT]The things that change most often are radio towers and buildings that may sprout up beyond average terrain. There may be a change to controlled sector borders or surface areas for airports or to runways here and there. Most changes we never notice unless it's a place we deal with often.
As I mentioned, mine arrived yesterday (Tuesday), and they're effective on the 9th (Friday), so 4 days in this case. It'll depend on the USPS, NACO, shipping times, etc.