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Pneumatic leak?

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virginia.gerrish(at)veriz
Guest

Posted: Sat Feb 02, 2013 12:34 pm Post subject: 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

  [quote][b]

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moe-rosspistons(at)hotmai
Guest

Posted: Sat Feb 02, 2013 2:04 pm Post subject: Pneumatic leak?

Hi Dave,



Back on May 24, 2004 Scott Dickey made a two page post, which I believe will address your accumulator problems.  If you can not find it in the archives please email me  jack(at)eclipseindustries.com and I will scan it and send it to you.  This was a very good post, therefore, I printed it and have kept it with my secret hydraulic file.

Regards,





"Moe" Mills

N680RR

680F(p)



From: virginia.gerrish(at)verizon.net

To: commander-list(at)matronics.com

Subject: Commander-List: Pneumatic leak?

Date: Sat, 2 Feb 2013 15:33:29 -0500

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

  [quote]



st" target="_blank">http://www.matronics.com/Navigator?Commander-List

http://forums.matronics.com

="_blank">http://www.matronics.com/contribution



[b]

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cloudcraft(at)aol.com
Guest

Posted: Sat Feb 02, 2013 2:24 pm Post subject: Pneumatic leak?

 	  Quote: 	
		  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

     

  

     

  

    --

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lloydsss11(at)MSN.COM
Guest

Posted: Sat Feb 02, 2013 2:53 pm Post subject: Pneumatic leak?

<?xml:namespace prefix="v" /><?xml:namespace prefix="o" /><![endif]-->  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 

 [quote]   ---

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dowens(at)aerialviewpoint
Guest

Posted: Sun Feb 03, 2013 4:50 pm Post subject: 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...

 [quote]   ---

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nico(at)cybersuperstore.c
Guest

Posted: Sun Feb 03, 2013 7:01 pm Post subject: Pneumatic leak?

Chuck Swan replied to this email thread:

 

https://www.facebook.com/COMMANDERFLIGHT/posts/505637129487977?comment_id=5309683&notif_t=feed_comment

 

Greetings,

Nico

 

 

From: owner-commander-list-server(at)matronics.com [mailto:owner-commander-list-server(at)matronics.com] On Behalf Of lloyd silverman

Sent: Saturday, February 02, 2013 2:54 PM

To: commander-list(at)matronics.com

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 

[quote]

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lloydsss11(at)MSN.COM
Guest

Posted: Mon Feb 04, 2013 3:56 pm Post subject: Pneumatic leak?

<?xml:namespace prefix="v" /><?xml:namespace prefix="o" /><![endif]-->  THE GAGE I REFERRED TO IS THE ONE MEASURING NITROGEN PRESSURE.

 [quote]   ---

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