pcondon(at)mitre.org
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 Posted: Wed Nov 22, 2006 6:04 am Post subject: RV-List Digest: Fuel line question (Dana) Now Steel fitting |
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Steel fuel fittings in the carb is used on all GA aircraft I have been
associated with
Over the years. The only reason that comes to mind is - when I've
worked on some aircraft the
Hoses were so dry rotted and stiff, and by stiff I mean rock hard
stiff, that the engine vibs,
Shaking and movement were allowing more strain and stress on the carb
fittings - and hence the carb
Body. Maybe the aluminum fitting would fail prior to the steel fitting.
Real answer is hose replacement
But you would surprised at the condition of hoses after a few
years(this is a stretch). The fire
Issue mentioned is another reason to use steel, again another stretch.
Also, a stress fracture in a carb fuel
Fitting would spray fuel around the exhaust area.
Oil return lines are aluminum as are the fittings on all aircraft I've
seen.
I would not try to rethink this one and go with the flow(no pun
intended). If there were ever a post crash
Investigation, using steel here would give the fed one less thing to
write up.....
Also also, the steel fitting on the front mounted case for prop
governor is a mandatory (by AD) steel fitting. I
Would tend to go with the flow here too and use steel.
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Time: 09:34:32 PM PST US
From: Kelly McMullen <kellym(at)aviating.com>
Subject: Re: : Fuel line question (Dana) Now Steel fittings
The only fitting that has to be steel is the prop governor line
connection at the front of the case, for those Lycomings with rear
mounted governors. Those were aluminum originally and had a history of
cracking. That is required by AD. The rest generally are aluminum.
linn Walters wrote:
| Quote: |
Originally I heard that it was due to aluminum melting prior to steel
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| Quote: | in a fire. OK, that's reasonable if you plan on an engine
compartment
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| Quote: | fire. However, I doubt the integrity of the fittings will make a
whole lot of difference in the eventual outcome. Then someone said
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| Quote: | that steel fittings were more resistant to fatigue cracking. OK,
that
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| Quote: | sounds reasonable. Balance the prop.
FWIW, I have aluminum fittings in the engine compartment of my Pitts
...... because I had them and it was before I knew about the
'concern'. They've been faithful for 25 years now. Hmmm. Maybe I
should worry??? Wonder what the warranty period is.
Linn
Dana Overall wrote:
>
>> Hi Dana, Reread the previous post...the fitting described here with
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| Quote: | >> the O-ring and jam nut enables you to clock the fitting in the
>> direction you choose....then tighten the jam nut against the O-ring
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| Quote: | >> to seal it tight. The fitting happens to be steel but it doesn't
>> have anything to do with the steel vs. aluminum topic. The fitting
>> can also come with a port for the fuel pressure line....I think you
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| Quote: | >> may have one of these on the upstream end of the hose......don't
>> have pic in front of me???
>
> Hey Rick what are you doing not working on the 10:-)
>
> Yes, I have both the fitting you talk about however, I have heard
> from so many people saying you ONLY want to use steel fittings on
> anything on the engine. Now is just a good time, with the alum
> fitting I was using to orient the hose, to discuss what is the deal
> with using only steel fittings when ECI and Van's both supply us
with
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| Quote: | > alum fitting either on the cyls. or with the firewall forward kit.
>
> PS, I have some alum fittings and some steel.
>
> Dana Overall
> Richmond, KY i39
> RV-7 slider, Imron black, "Black Magic"
> O 360 A1A, C/S C2YK-1BF/F7666A4
> http://rvflying.tripod.com/id30.html
> do not archive
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