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Re: Tailplane bushes

Subject: Re: Tailplane bushes
From: Graham Singleton <100421.2123@compuserve.com>
Date: Sat, 21 Oct 1995 20:31:09
>>Anyone at the tail stage should carefully note the instruction to scuff 
and groove the bushes within. <<

My advice is to thoroughly dimple the stainless steel bushes with a 3/16 drill.
Be careful not to distort the inside surface or the bush will jam. I don't think
scuffing with 60 grit is enough. Epoxy won't chemically bond to stainless,
ordinary or any plain metal. In the case of aluminium, eventually corosion will
creep between the resin and the metal and separate the two. I always etch any
aluminium parts to be embedded with Alodine. Anodising is even better. In the
case of anodised parts it is only necessary to solvent clean/degrease. Scuffing
IMHO is a backward step. Please get a second opinion on this and only tell me if
I'm wrong. BTW I am not always right.
The important thing is that it's bad news if the bushes come loose, particularly
the outboard ones. It has been known to happen.

Graham



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