Today's Message Index:
----------------------
1. 12:34 PM - Pneumatic leak? (Dave Gerrish)
2. 02:04 PM - Re: Pneumatic leak? (Moe Mills)
3. 02:24 PM - Re: Pneumatic leak? (Keith S. Gordon)
4. 02:53 PM - Re: Pneumatic leak? (lloyd silverman)
Message 1
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Hello fellow Commander enthusiasts. I have been reading the back and forth
information on the site for several years but have not chimed in. Until
today.
I own one half of a 500S, N47AC, based in Warrenton, Virginia KHWY. My
partner, Ken Hyde and I have had an interesting time over the last several
years
with the landing gear actuators. Here is the latest. Earlier in the week I
went down to the hangar to preflight and the pneumatic gage was at 150PSI
for no known reason, so I pumped it with nitrogen back to 300PSI. Did not
fly the airplane. Today I am back in the hangar and there is a big puddle
of hydraulic fluid on the floor under the left nacelle. Turns out the
reservoir is showing way past full and it looks to me like the fluid just
went out in the overflow tube in the reservoir on to the floor. OK, so I am
thinking one of the pneumatic main gear actuators must have some kind of
internal failure that allows the nitrogen to push the hydraulic fluid into
the reservoir and when it gets full, onto the floor it goes. Ken and I I'm
sure will research this but I am wondering if others have had this kind of
thing happen to them?
I am also wondering if others just get rebuilt, yellow tagged actuators, or
if they buy new ones or if they pull the darn things apart and fix them
themselves, assuming they meat dimensional specs.
Any thoughts or comments would be greatly appreciated. Dave Gerrish
Message 2
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Hi Dave=2C
Back on May 24=2C 2004 Scott Dickey made a two page post=2C which I believe
will address your accumulator problems. If you can not find it in the arc
hives please email me jack@eclipseindustries.com and I will scan it and se
nd it to you. This was a very good post=2C therefore=2C I printed it and h
ave kept it with my secret hydraulic file.
Regards=2C
"Moe" MillsN680RR680F(p)
From: virginia.gerrish@verizon.net
Subject: Commander-List: Pneumatic leak?
Hello fellow Commander enthusiasts. I have been reading the back and forth
information on the site for several years but have not chimed in. Until t
oday.I own one half of a 500S=2C N47AC=2C based in Warrenton=2C Virginia KH
WY. My partner=2C Ken Hyde and I have had an interesting time over the las
t several years with the landing gear actuators. Here is the latest. Earl
ier in the week I went down to the hangar to preflight and the pneumatic ga
ge was at 150PSI for no known reason=2C so I pumped it with nitrogen back t
o 300PSI. Did not fly the airplane. Today I am back in the hangar and the
re is a big puddle of hydraulic fluid on the floor under the left nacelle.
Turns out the reservoir is showing way past full and it looks to me like t
he fluid just went out in the overflow tube in the reservoir on to the floo
r. OK=2C so I am thinking one of the pneumatic main gear actuators must ha
ve some kind of internal failure that allows the nitrogen to push the hydra
ulic fluid into the reservoir and when it gets full=2C onto the floor it go
es. Ken and I I=92m sure will research this but I am wondering if others h
ave had this kind of thing happen to them?I am also wondering if others jus
t get rebuilt=2C yellow tagged actuators=2C or if they buy new ones or if t
hey pull the darn things apart and fix them themselves=2C assuming they mea
t dimensional specs.Any thoughts or comments would be greatly appreciated.
Dave Gerrish
Message 3
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| Subject: | Re: Pneumatic leak? |
OK, so I am thinking one of the pneumatic main gear actuators must have som
e kind of internal failure that allows the nitrogen to push the hydraulic f
luid into the reservoir and when it gets full, onto the floor it goes.
Dave,
I'm not an aircraft mechanic (I find it's way easier and faster to break an
airplane that to fix one) but you could have one or both of the outboard "
pneudraulic" actuators by-passing pneumatic pressure.
Morris Kernick taught me long ago that if you take a clean rag and hold it
over and then open the Schraeder valve for the nitrogen bottle any hydrauli
c fluid in that system will blow out onto the rag. Best to use a white rag
rather than the usual red shop towel for this test.
Hydraulic fluid on the rag would show that your pneumatic and hydraulic sys
tems are "communicating" with each other.
An O-ring rebuild kit may be all that's needed but your statement about hav
ing an "interesting time over the last several years with the landing gear
actuators," is an interesting statement.
... As in the ancient Chinese curse: "May you live in interesting times."
Wing Commander Gordon
Life is not simple anywhere. Probably less so elsewhere.
KHND RNAV Lead
FAASTeam Lead Rep, Las Vegas
NBAA Access Committee
Las Vegas Airspace Users' Council, NBAA Rep
Las Vegas RNAV Optimization Work Group, NBAA Rep
Las Vegas Class B Redesign Committee, NBAA Rep
-----Original Message-----
From: Dave Gerrish <virginia.gerrish@verizon.net>
Sent: Sat, Feb 2, 2013 12:35 pm
Subject: Commander-List: Pneumatic leak?
Hello fellow Commander enthusiasts. I have been reading the back and forth
information on the site for several years but have not chimed in. Until t
oday.
I own one half of a 500S, N47AC, based in Warrenton, Virginia KHWY. My par
tner, Ken Hyde and I have had an interesting time over the last several yea
rs
with the landing gear actuators. Here is the latest. Earlier in the week
I went down to the hangar to preflight and the pneumatic gage was at 150PSI
for no known reason, so I pumped it with nitrogen back to 300PSI. Did not
fly the airplane. Today I am back in the hangar and there is a big puddle
of hydraulic fluid on the floor under the left nacelle. Turns out the res
ervoir is showing way past full and it looks to me like the fluid just went
out in the overflow tube in the reservoir on to the floor. OK, so I am th
inking one of the pneumatic main gear actuators must have some kind of inte
rnal failure that allows the nitrogen to push the hydraulic fluid into the
reservoir and when it gets full, onto the floor it goes. Ken and I I
=99m sure will research this but I am wondering if others have had this kin
d of thing happen to them?
I am also wondering if others just get rebuilt, yellow tagged actuators, or
if they buy new ones or if they pull the darn things apart and fix them th
emselves, assuming they meat dimensional specs.
Any thoughts or comments would be greatly appreciated. Dave Gerrish
Message 4
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| Subject: | Re: Pneumatic leak? |
MY 500B HAS HAD SIMILAR PROBLEMS. ONE ACTUATOR IN EACH NACELLE IS
HYDRAULIC ON ONE END & PNUEMATIC ON THE OTHER END. O RING FAILURES WILL
ALLOW THEM TO MIX. MAKE SURE YOU REMOVE THE NITROGEN TANK IN THE
BAGGAGE COMPARTMENT DURING THE REPAIR AS IT TENDS TO COLLECT THE FLUID
TRAVELING IN THE PNUEMATIC SYSTEM. GOOD LUCK, LLOYD N6290X
----- Original Message -----
From: Keith S. Gordon<mailto:cloudcraft@aol.com>
To: commander-list@matronics.com<mailto:commander-list@matronics.com>
Sent: Saturday, February 02, 2013 5:24 PM
Subject: Re: Commander-List: Pneumatic leak?
OK, so I am thinking one of the pneumatic main gear actuators must
have some kind of internal failure that allows the nitrogen to push the
hydraulic fluid into the reservoir and when it gets full, onto the floor
it goes.
Dave,
I'm not an aircraft mechanic (I find it's way easier and faster to
break an airplane that to fix one) but you could have one or both of the
outboard "pneudraulic" actuators by-passing pneumatic pressure.
Morris Kernick taught me long ago that if you take a clean rag and
hold it over and then open the Schraeder valve for the nitrogen bottle
any hydraulic fluid in that system will blow out onto the rag. Best to
use a white rag rather than the usual red shop towel for this test.
Hydraulic fluid on the rag would show that your pneumatic and
hydraulic systems are "communicating" with each other.
An O-ring rebuild kit may be all that's needed but your statement
about having an "interesting time over the last several years with the
landing gear actuators," is an interesting statement.
... As in the ancient Chinese curse: "May you live in interesting
times."
Wing Commander Gordon
Life is not simple anywhere. Probably less so elsewhere.
KHND RNAV Lead
FAASTeam Lead Rep, Las Vegas
NBAA Access Committee
Las Vegas Airspace Users' Council, NBAA Rep
Las Vegas RNAV Optimization Work Group, NBAA Rep
Las Vegas Class B Redesign Committee, NBAA Rep
-----Original Message-----
From: Dave Gerrish <virginia.gerrish@verizon.net>
To: commander-list <commander-list@matronics.com>
Sent: Sat, Feb 2, 2013 12:35 pm
Subject: Commander-List: Pneumatic leak?
Hello fellow Commander enthusiasts. I have been reading the back and
forth information on the site for several years but have not chimed in.
Until today.
I own one half of a 500S, N47AC, based in Warrenton, Virginia KHWY.
My partner, Ken Hyde and I have had an interesting time over the last
several years
with the landing gear actuators. Here is the latest. Earlier in the
week I went down to the hangar to preflight and the pneumatic gage was
at 150PSI for no known reason, so I pumped it with nitrogen back to
300PSI. Did not fly the airplane. Today I am back in the hangar and
there is a big puddle of hydraulic fluid on the floor under the left
nacelle. Turns out the reservoir is showing way past full and it looks
to me like the fluid just went out in the overflow tube in the reservoir
on to the floor. OK, so I am thinking one of the pneumatic main gear
actuators must have some kind of internal failure that allows the
nitrogen to push the hydraulic fluid into the reservoir and when it gets
full, onto the floor it goes. Ken and I I=99m sure will research
this but I am wondering if others have had this kind of thing happen to
them?
I am also wondering if others just get rebuilt, yellow tagged
actuators, or if they buy new ones or if they pull the darn things apart
and fix them themselves, assuming they meat dimensional specs.
Any thoughts or comments would be greatly appreciated. Dave Gerrish
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