I check mine before each flight provided there is a ground check
available, and then I just write it on my kneeboard with the required
date, type of test etc. That way it is always current (and if I am
somewhere I can't check it usually have a few months of old papers on
the knee board anyway), and I know immediately if it is misbehaving.

--
--Ray Andraka, P.E.
President, the Andraka Consulting Group, Inc.
401/884-7930 Fax 401/884-7950
email
http://www.andraka.com

"They that give up essential liberty to obtain a little
temporary safety deserve neither liberty nor safety."
-Benjamin Franklin, 1759