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 po
int that it was chafing against an adjacent line.- The second failure sho
rtly thereafter was out side of the compartment in the wing root and just d
umped the fluid outside along the fuselage.- That was the one due to an i
mproper flare.- The mechanic showed it to me.=0A=0A=0A=0A=0A_____________
___________________=0AFrom: Tom Fisher <tfisher@commandergroup.bc.ca>=0ATo:
commander-list@matronics.com=0ASent: Sun, November 15, 2009 10:00:17 AM=0A
Subject: Re: AC-680FLP Hydraulic line problems=0A=0A=0AIn a
ddition to the last failure two years before that the line entering the bag
gage compartment from the right wing root ruptured at a chaff point and pis
sed Skydrol all over the main wiring bundle-which dissolved all the insul
ation 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.=0A-=0ATom=0AFormally C-GISS=0A680FLP (Mr.RP
M)=0A----- Original Message ----- =0A>From: Donald Falik =0A>To: commander-
list@matronics.com =0A>Sent: Sunday, November 15, 2009 6:32 AM=0A>Subject:
Re: AC-680FLP Hydraulic line problems=0A>=0A>=0A>I can rela
te a similar issue with my 500S.- I had one line fail due to chafing in t
he baggage area.- Boy was that a mess when the fluid erupted in the bagga
ge compartment.- Shortly thereafter another line failed just beyond the r
epaired one and it was due to an improper flare from a previous repair.=0A>
Don=0A>=0A>=0A>=0A>=0A________________________________=0AFrom: Chris <cschu
erm@cox.net>=0A>To: commander-list@matronics.com=0A>Sent: Sun, November 15,
2009 9:15:52 AM=0A>Subject: Re: AC-680FLP Hydraulic line p
t>=0A>=0A>Ray Mansfield wrote:=0A>> In other words, is this going to be a p
roblem in the next hours of flight or next years of flight. Does anyone hav
e experience here?=0A>=0A>Ray,=0A>If the line failed right at the flare, it
was probably due to improper fabrication.- I've seen many cases where so
meone has made a line and didn't know that aircraft aluminum lines use a di
fferent flare angle than copper lines.- The tool you'll find at your loca
l hardware store to flare line ends is for copper only and makes too sharp
an angle for aluminum.- This causes cracks to form.=0A>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 deal
ing with aging aircraft issues.- During my commander restoration, we ende
d 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 sup
ported and that the adel clamps are not loose or missing.- If the lines a
re 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
www.homebuip; - - - - - - - - - - &n======
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ks.com">www.buildersbooks.com >href="http://www.homebuilthelp.com">www.ho
mebuilthelp.com >href="http://www.matronics.com/contribution">http://www.
matronics.com/chref="http://www.matronics.com/Navigator?Commander-List">h
ttp://www.matronics.com/Navigator?Commander-Listhref="http://forums.matro
nics.com">http://forums.matronics.com=0A>=0A>=0A>=0A>=0A>href="http://www
==
