In article , "Dennis O'Connor"
wrote:

So, under Part 91 (which didn't exist then) do I have to be able to prove
that the steel in the airframe is 'approved', and the magnesium, and
aluminum, and the yokes, etc., etc., none of which have any kind of tags,
or
serial numbers?

but they have part numbers, don't they?

--
Bob Noel