OK, thanks, Tylor.
_____
From: owner-commander-list-server@matronics.com
[mailto:owner-commander-list-server@matronics.com] On Behalf Of Tylor Hall
Sent: Sunday, November 15, 2009 3:27 PM
To: commander-list@matronics.com
Subject: Re: AC-680FLP Hydraulic line problems
NICO,
NO, SS is twice the weight per foot as Aluminum. .080 VS .0453
Typo error.
Tylor Hall
On Nov 15, 2009, at 4:07 PM, nico css wrote:
Tylor,
Aluminum is 5 times heavier than SS? I guess wall-thickness will have
something to do with it, right?
Nico
_____
From: owner-commander-list-server@matronics.com
[mailto:owner-commander-list-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
weight.
:)
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 the
baggage compartment from the right wing root ruptured at a chaff point and
pissed Skydrol all over the main wiring bundle which dissolved all the
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 bundle in
a Skydrol proof sheath so they would be protected from any other leaks that
may occur in the future.
Tom
Formally C-GISS
680FLP (Mr.RPM)
----- Original Message -----
From: Donald Falik <mailto:dfalik@sbcglobal.net>
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
chafing in the baggage area. Boy was that a mess when the fluid erupted in
the baggage compartment. Shortly thereafter another line failed just beyond
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 flight
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
fabrication. 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 also
"work hardens" from vibration and becomes more brittle with age. You may
simply be dealing with aging aircraft issues. During my commander
restoration, 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 scotch
bright and look for corrosion pitting. Even small pits lead to failure.
Look for any areas where the lines are chaffing (usually due to something
coming loose) and address those areas immediately. It's all just part of
being the care-talectric www.aeroelttp://www.buildersbooks.com/" tHELP
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