RE: [COUPERS-TECH] Confusion and main spars

Tue, 17 Apr 2001 19:56:22 -0700 

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         And to add to Jim and Jim’s notes. Add you can only go a 10th of the metals depth.

 

-----Original Message-----
From: Jim McLean [mailto:[EMAIL PROTECTED]
Sent: Tuesday, April 17, 2001 9:37 AM
To: Coupers Tech
Subject: Re: [COUPERS-TECH] Confusion and main spars

 

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Hi Jim,


What you describe does sound like exfoliation corrosion.  It has a peeling


appearance like an onion skin.  Usually you can grasp a piece with 

needle-nose pliers and just peel it right off the surface.  I found the
same 

corrosion in my center section on the inside spar cap face just above the 

main gear attachment bolts.  I believe it is due to dissimilar metals.
 I 

have heard of people taking the exfoliation off down to clean shiny metal and 

repairing just as you have done.  Would still require inspection and
sign-off 

by an IA, I believe. 

Jim 



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