>>>BMcgu22954@aol.com said:
> A magnafluxed piece from a company that's FAA approved should come with a
> certificate.
Correct; this is usually a yellow tag attached to the part, that is then
removed when the part is installed and then stapled to the the aircraft's
logbook. Parts certified as passing inspection and thus ready to install are
called "yellow-tagged"; if you read the used parts ads from Trade-a-Plane
you'll often see such assurances. "Red Tags" mean a part was found
un-airworthy and was removed from service. THey should either be rebuilt or
repaired (in acceptable ways, in which case they can earn new yellow tags:
example, a cracked cylinder head repaired by welding, or a dead magneto
rebuilt) or destroyed.
> Die penetrant is also widely used.
Dye penetrant inspection is often specified for aircraft parts. I helped the
mechanic do a DP on the left lower engine mount on my old Beech Musketeer
once. There's a recurring Airworthiness Directive that mandates this
inspection for cracks. Luckily you can do it without taking the engine mount
casting out of the plane, but it looks weird (but is perfectly safe)
if you don't clean all the dye off.
--berry
Berry Kercheval :: kerch@parc.xerox.com :: Xerox Palo Alto Research Center
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