>
> 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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