Received-SPF: pass
 receiver=logan.com; client-ip=64.136.22.78; envelope-from=jbker@juno.com
To: flyrotary@lancaironline.net
Date: Sat, 18 Jun 2005 17:57:20 -0400
Subject: Re: [FlyRotary] Re: FW: Do Not Use Auto Brake Fluid
Message-ID: <20050618.175720.2332.1.JBKER@juno.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
From: WALTER B KERR <jbker@juno.com>


On Sat, 18 Jun 2005 17:11:55 -0400 "Ian Dewhirst" <ianddsl@magma.ca>
writes:
> Thanks Ed,
> 
> I have been following the discussion and your post prompted me to 
> see what
> aircraft brake fluid was all about.  For those who haven't bothered 
> to
> google this, Mil-H-5606 is a mineral based hydraulic oil (unlike 
> brake fluid
> which is glycol or silicone based) with a flashpoint of 284 degrees
> Fahrenheit.  Hmmm, no wonder people have brake fires.  The up side 
> is it is
> pretty much the same price as DOT-X.
> 
> Anybody have an idea why hydraulic oil is chosen?  I know hydraulic 
> oil is
> used in heavy equipment to apply the brakes, I think the simple 
> reason in
> that application is that there is a lot of it pressurized and 
> available. I
> trust that is not the reason it is used in a C172? -- Ian
> 
> P.S. Good Luck Ed!
> 
>  Do NOT use automotive brake fluid in aircraft brake systems.  
> Incompatible
> with the seal materials.  See information at
> http://www.groveaircraft.com/brake_info.html
> 
> Ed A

=======================================================
A friend of mine says ATF is the same as aircraft brake fluid. Ran it
over 400 hours without any problem in my RV6A. He is an EAA tech adviser
and another engineer from Pratt-Whitney. Never tried to check it out,
just went on blind faith. I have aircraft brake fluid in the 9A, just
because it was handy.

Bernie