It's not in the CFRs; it was in an AC. SSA has a copy that you can
download. It expires every two years and is renewed; you need the
original letter and the latest renewal in your cockpit. They are both
available on the SSA site.

At 14:25 08 July 2008, DRN wrote:
Somebody must know this; I couldn't find it in the FARs.
ASA web site has an exemption document expired 1990.
Couldn't find anything on SSA web site.
There was an NPRM for a permanent glider exemption,
but I couldn't find out what happened...

So, what is the current story regarding data plates for
gliders ? Is there a current exemption letter we're
supposed to carry about the skies ? My exemption
letter copy expired in 2004...

Thanks in advance,
Best Regards, Dave "YO electric"