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Re: Magnaflux

To: shop-talk@Autox.Team.Net
Subject: Re: Magnaflux
From: Brian Kelley <bkelley@ford.com>
Date: Wed, 05 Mar 1997 10:29:09 EST
> 
> On Mar 4, 10:57pm, "Dunst, Mordecai" wrote:
> >      Q)  Conventional wisdom dictates that a magnafluxed piece of 
> >      ferrous metal is OK to use.  Suppose that piece of metal has been
> >      used for MANY hours...under hard loads.  i.e. a buddy of mine has
> >      an older airplane.  About 8,000 hrs on the engine.  He has the 
> >      standard annual and has the crank magnafluxed-"OK".  He says the
> >      FAA says its ok to re-use.  Is it?  
> 
> I'm by no means an expert, but my understanding is that magnafluxing
> will only detect surface cracks.  X-raying will detect internal
> flaws (if they're big enough and the operator is good enough at
> their diagnosis), but I'd guess that after 8,000 hours you'd 
> already know about any internal flaws.  I guess what you need to
> be worried about is fatigue, and I don't know of a method to
> detect that until it progresses so far that cracks are propogated
> to the surface.  Anyone else know of one?

I believe every critical component in an aircraft engine has a rated
service life, as required by the FAA.  When you reach it, you throw it
away.

Check the factory manuals or ask a Real aircraft mechanic.  He should
know and I would switch mechanics if he didn't.

  Brian


--
bkelley@ford.com


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