In defense of Century, the gyro may well have been in spec when it left
the factory. Shock during transit or sitting too long on the shelf can put
flat spots in the bearings that will cause precession. All it takes is
someone
dropping the shipping carton, or even sitting on the avionics shop shelf (or
in
your airplane) without spinning for more than a month or two.

Scott Moore wrote:

Besides, their
quality control is obviously suspect, since they let the unit go with
out of tolerance precession in the first place.

--
--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