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Re: Magnaflux

To: BMcgu22954@aol.com
Subject: Re: Magnaflux
From: Berry Kercheval <kerch@parc.xerox.com>
Date: Fri, 7 Mar 1997 22:40:42 PST
>>>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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