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Date: Mon, 18 Dec 2006 12:46:45 -0500
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From: Earl Schroeder <earleschroeder@yahoo.com>
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Subject: Re: [LML] Tubing
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In the GE Plastics facility [Lexan, Mt Vernon, IN] and with 30+ years of 
experience working with compression fittings [Tylok, Gyrolok, and 
Swagelok] I would not recommend using any of them in our aircraft.  
Tylok is the most forgiving with Gryolok next but Swagelok is the most 
likely to fail at the juncture of the two ferrules due to any vibration 
of the tubing.  Over the years, we did may tests to destruction as the 
vendors attempted to demonstrate their superiority.

That is not to say they can not be installed with care [follow the 
instructions] to function reliability during the life of the aircraft.  
Their pressure ratings far exceed our requirements but it is the 
vibration issue that causes them to fail especially if they are 
overtightened during installation or re tightened after maintenance.

I do not have any metal 'compression' fittings in my Lancair.  I did use 
some nylon types in the static system but the plastic tubing withstands 
vibration much better IMHO. 

Just my 2 cents.. Earl

James Cameron wrote:
> For Craig b:  Yes, I used Swagelok for some of the hydraulics -- their 
> pressure ratings are more than adequate.  I didn't use it for all, 
> however, because of the need for bulkhead 90's and 45's, plus the fact 
> that I already had the flare fittings (paid for) as part of the kit.
>  
> Jim Cameron
> Legacy N132X reserved
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