----[Please read http://ercoupers.com/disclaimer.htm before following any advice in this forum.]----
Pete,
From whom did you ask approval and who said no? I have never seen a
337
or STC for this or never heard of anyone asking for one.
Kevin
-----Original Message-----
From: Pete Thomson [mailto:[EMAIL PROTECTED]
Sent: Thursday, April 29, 2004 11:41 AM
To: 'Ercoupe Technical Discussion'
Subject: [COUPERS-TECH] RE: Digest list: Ercoupe Technical Discussion
(moderated)
----[Please read http://ercoupers.com/disclaimer.htm before following any
advice in this forum.]----
Good morning Steve, I have seen Coupes with the threaded ends and wanted
to
do that to my fuel hoses. I was unable to find approval for such a change
and also unable to find the restrictor fitting with threaded ends for the
fule pump. Does anyone on site know if there is a 337 or STC for using the
better steel braided fuel hoses with the threaded ends, and if so, where
did
you get the restrictor fitting? I use 2 clamps on the ends of all the
hoses
but still have concerns about a hose coming off in flight, and the
possible
engine fire that would result. Thanks Alaska Pete
----------------------------
From: [EMAIL PROTECTED]
To: ercoupe tech <[email protected]>
Reply-To: [EMAIL PROTECTED]
Subject: [COUPERS-TECH] more on fuel hoses
OK. I am going to send this only to the tech list, since we have been
asked
to refrain from "double posting".
Since I started the fuel hose thread I think I should add to it as well.
I was wondering how many people are using fuel and oil hoses with metal
pipe-thread ends, and how many are still using the push on type, secured
by hose clamps.
It seems to me that changing to the threaded ends means changing all my
metal
fuel line ends, which is real "pretzel" work.
Thanks for the note about mil-h-6000 being changed to mil-dtl-6000. I
think
that is where the confusion came from. I was worried that the change, and
the
fact that it says "not recommended for fuel" was because of a material
change
in the hose. It appears that the note refers to the fact that most modern
aircraft use "finished" hoses with fittings, and that is probably what
most
engineers would look for.
The fact that the coupe was made with push-on ends probably leaves us in
the
minority. However, it property installed, and coated with fire-sleeves, I
don't
see why it wouldn't be just as safe.
One problem with looking at other hoses is that the newer hoses are
lighter
and
are acually a smaller diameter for the same hose. For instance the -6 hose
is
actually an I.D. of .32 rather than .37. It might make it difficult to
push
on
the old fittings. The -8 hose is .41 ID and would probably work just as
well
and be lighter in the long run. The same may hold true with the -4 hoses
for
the fuel pump. You may have to go up one size to get it to fit the
fittings.
Steve Finkelman
C-FIWR
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