Today's Message Index:
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1. 04:50 PM - Re: Pneumatic leak? (David Owens)
2. 07:01 PM - Re: Pneumatic leak? (Nico CSS)
Message 1
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| Subject: | Re: Pneumatic leak? |
iF i AM NOT MISTAKEN, the gauge you are referring to is the blow down
bottle pressure, right? The one on the bottle in the baggage
compartment? It has been our experiance that when the blow down bottle
is over filled it can cause all kinds of problems like this...
----- Original Message -----
From: Dave Gerrish
To: commander-list@matronics.com
Sent: Saturday, February 02, 2013 2:33 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'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
No virus found in this message.
Checked by AVG - www.avg.com
02/03/13
Message 2
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Chuck Swan replied to this email thread:
https://www.facebook.com/COMMANDERFLIGHT/posts/505637129487977?comment_id
=5309683¬if_t=feed_comment
Greetings,
Nico
From: owner-commander-list-server@matronics.com
[mailto:owner-commander-list-server@matronics.com] On Behalf Of lloyd
silverman
Sent: Saturday, February 02, 2013 2:54 PM
Subject: Re: Commander-List: 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>
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>
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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