Aluminum is just fine as a replacement. After all original lasted 40+ yea
rs!!
-----Original Message-----
From: nico css <nico@cybersuperstore.com>
To: commander-list@matronics.com
Sent: Sun, Nov 15, 2009 3:07 pm
Subject: RE: AC-680FLP Hydraulic line problems
Tylor,
Aluminum is 5 times heavier than SS? I guess wall-thickness will have some
thing to do with it, right?
Nico
From: owner-commander-list-server@matronics.com [mailto:owner-commander-li
st-server@matronics.com] On Behalf Of Tylor Hall
Sent: Sunday, November 15, 2009 9:23 AM
To: commander-list@matronics.com
Subject: Re: AC-680FLP Hydraulic line problems
SS 1/4" tubing is 0.08 lbs per foot, and Alum 1/4" tubing is 0.453 lb. per
foot.
300 feet of tubing exchanged out would be 13.50 lb. added to the empty wei
ght.
:)
Tylor Hall
On Nov 15, 2009, at 10:12 AM, Donald Falik wrote:
Thank goodness it wasn't Skydrol. The failure of the line in the baggage
compartment was difficult to find because it was just a pin hole at the
point that it was chafing against an adjacent line. The second failure
shortly thereafter was out side of the compartment in the wing root and
just dumped the fluid outside along the fuselage. That was the one due
to an improper flare. The mechanic showed it to me.
From: Tom Fisher <tfisher@commandergroup.bc.ca>
To: commander-list@matronics.com
Sent: Sun, November 15, 2009 10:00:17 AM
Subject: Re: AC-680FLP Hydraulic line problems
In addition to the last failure two years before that the line entering th
e baggage compartment from the right wing root ruptured at a chaff point
and pissed Skydrol all over the main wiring bundle which dissolved all th
e insulation on most of the wires. I had to replace almost all the wires
in the bundle. Once that was done and paid for I wrapped the entire bund
le in a Skydrol proof sheath so they would be protected from any other lea
ks that may occur in the future.
Tom
Formally C-GISS
680FLP (Mr.RPM)
----- Original Message -----
From: Donald Falik
To: commander-list@matronics.com
Sent: Sunday, November 15, 2009 6:32 AM
Subject: Re: AC-680FLP Hydraulic line problems
I can relate a similar issue with my 500S. I had one line fail due to cha
fing in the baggage area. Boy was that a mess when the fluid erupted in
the baggage compartment. Shortly thereafter another line failed just bey
ond the repaired one and it was due to an improper flare from a previous
repair.
Don
From: Chris <cschuerm@cox.net>
To: commander-list@matronics.com
Sent: Sun, November 15, 2009 9:15:52 AM
Subject: Re: AC-680FLP Hydraulic line problems
Ray Mansfield wrote:
> In other words, is this going to be a problem in the next hours of fligh
t or next years of flight. Does anyone have experience here?
Ray,
If the line failed right at the flare, it was probably due to improper fab
rication. I've seen many cases where someone has made a line and didn't
know that aircraft aluminum lines use a different flare angle than copper
lines. The tool you'll find at your local hardware store to flare line
ends is for copper only and makes too sharp an angle for aluminum. This
causes cracks to form.
You also mentioned that you've been repairing corrosion in other areas.
The aluminum used for aircraft lines is fairly prone to corrosion. It al
so "work hardens" from vibration and becomes more brittle with age. You
may simply be dealing with aging aircraft issues. During my commander re
storation, we ended up having to replace virtually every hard line in the
airplane for these reasons. I'd suggest a very careful inspection of all
your hard lines - especially the ones exposed in the nacelles. Make sure
they are well supported and that the adel clamps are not loose or missing
. If the lines are allowed to vibrate due to old, worn-out supports, that
can lead to rapid fatigue cracking. Clean the lines carefully with scotc
h bright and look for corrosion pitting. Even small pits lead to failure.
Look for any areas where the lines are chaffing (usually due to somethin
g coming loose) and address those areas immediately. It's all just part
of being the care-talectric www.aeroelttp://www.buildersbooks.com/" tHELP
www.homebuip; &n============
==
href="http://www.aeroelectric.com">www.aeroelectric.com
ref="http://www.buildersbooks.com">www.buildersbooks.com
ref="http://www.homebuilthelp.com">www.homebuilthelp.com
ref="http://www.matronics.com/contribution">http://www.matronics.com/chr
ef="http://www.matronics.com/Navigator?Commander-List">http://www.matron
ics.com/Navigator?Commander-Listhref="http://forums.matronics.com">http:
//forums.matronics.com
www.aerow.buildersbooks.com/" rel=nofollow target=_blank>www.buildersb
ooks.comhttp://www.matronronics.com/Navigator?Commander-List" rel=nofoll
ow target=_blank>http://htt===============
========
color="#000000" face="courier new,courier">www.aeroelectric.com
ref="http://www.buildersbooks.com">www.buildersbooks.com
ref="http://www.homebuilthelp.com">www.homebuilthelp.com
ref="http://www.matronics.com/contribution">http://www.matronics.com/con
tribution
ref="http://www.matronics.com/Navigator?Commander-List">http://www.matro
nics.com/Navigator?Commander-List
ref="http://forums.matronics.com">http://forums.matronics.com
www.aeroelectric.com
ref="http://www.buildersbooks.com">www.buildersbooks.com
ref="http://www.homebuilthelp.com">www.homebuilthelp.com
ref="http://www.matronics.com/contribution">http://www.matronics.com/con
tribution
ref="http://www.matronics.com/Navigator?Commander-List">http://www.matro
nics.com/Navigator?Commander-List
ref="http://forums.matronics.com">http://forums.matronics.com
========================
===========
-
-= -- Please Support Your Lists This Month --
-= (And Get Some AWESOME FREE Gifts!)
-
-= November is the Annual List Fund Raiser. Click on
-= the Contribution link below to find out more about
-= this year's Terrific Free Incentive Gifts provided
-= by:
-= * AeroElectric www.aeroelectric.com
-= * The Builder's Bookstore www.buildersbooks.com
-= * HomebuiltHELP www.homebuilthelp.com
-
-= List Contribution Web Site:
-
-= --> http://www.matronics.com/contribution
-
-= Thank you for your generous support!
-
-= -Matt Dralle, List Admin.
-
-========================
========================
===========
-= - The Commander-List Email Forum -
-= Use the Matronics List Features Navigator to browse
-= the many List utilities such as List Un/Subscription,
-= Archive Search & Download, 7-Day Browse, Chat, FAQ,
-= Photoshare, and much much more:
-
-= --> http://www.matronics.com/Navigator?Commander-List
-
-========================
========================
===========
-= - MATRONICS WEB FORUMS -
-= Same great content also available via the Web Forums!
-
-= --> http://forums.matronics.com
-
-========================
========================
===========
