Wet Signature on W&B?

Got asked a question that I can't find the answer to.

Say I take a feller's logbooks home during the annual and after a few hours of
grunt and scream I come up with what I think is the current equipment list and a
defensible weight and balance. I sign off the w&b in the logbook and give the
feller the printout equipment list with the same weight and balance figures as
are in the logbook.

I print this out with my printed name and certificate number at the bottom, but
don't sign the printout. Or he asks a few months later for a copy of the w&b by
email. I sure as hell have a hard time poking ink down the phone lines.

So, sez, I, where in the regs is it stated that the w&b that you carry on board
the airplane needs a signature? I can't find it. Please, no answers telling me
how to cut and paste a signature into a spreadsheet. That is child's play, and
besides, how the hell do you know that somebody didn't cut and paste phony data
over my signature?

So, chapter and verse REQUIRING a signature on the w&b in the aircraft?

Jim
Jim Weir (A&P/IA, CFI, & other good alphabet soup)
VP Eng RST Pres. Cyberchapter EAA Tech. Counselor
http://www.rst-engr.com