Here ya go:

http://www.access.gpo.gov/nara/cfr/w...9cfrv2_03.html

180.205 and 180. 209 are the ones you're looking for. 180.209 is the chapter
with the number of years between hydro. There were some recent changes to
180.205, but not that you'd notice, bottom line on .205 is you have to have
the cylinder hydro'd prior to re-filling.

Jim

"Frank Smith" wrote in message
link.net...
I know it is out there someplace but I cannot find it, I always thought it
was a DOT thing.
Anybody have the official link to where the cylinder testing intervals are
defined?

Fly safe, have fun,
Frank

to reduce SPAM my return address has been slightly altered.