I hate to say it, but you - ASFKAP, Rigga, and Mr @ Spotty M - are right.
I just checked Part M (M.A.306 (c))... "... 36 months after the date of the last entry".
Apparently, I am too much involved with Part 145 (at least, thatīs what Operator Engineers have told me before...).
Thanks, guys!
Cheers, J.V.