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Depressurizing a Commander

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moe-rosspistons(at)hotmai
Guest

Posted: Fri Jan 30, 2009 11:14 am Post subject: Depressurizing a Commander

Commander Drivers:

  

 Has anyone been involved in removing all  of the pressurizing equipment in a commander (the one I have is a 680Fp),  changing the New York Air Brake Company hydraulic pumps back to normal pumps,  and converting the Skydrol to red fluid?  One of the major expenses of  maintaining the aircraft is the Pressurization system which requires the big  pumps and Skydrol., Since my flying missions have changed since retirement,  certified known icing and pressurization are no longer absolute  requirements.  Based on a past history of about the last 900 hours, removal  of these two systems would cut maintenance cost more than 50%.  Also, the  de-icing equipment weighs 70.2 pounds, and the pressurization optional (the  680Fp was not certified as a pressurized airplane) equipment weighs 89.5  pounds.  After removing this equipment I could then install a cool air  (Freon) air conditioner, which would really be nice here in the New Mexico  desert.

  

 Any and all comments will be greatly  appreciated.

  

 Regards,

  

 Moe Mills

 N680RR

 680Fp

  



  From: Jim Addington (jtaddington(at)verizon.net) 

 Sent: Thursday, January 29, 2009 8:16 PM

 To: commander-list(at)matronics.com (commander-list(at)matronics.com)  

 Subject: RE: FW: Amazing video

 



  

That is a good video  and that is what the new leaders in this country are going to do there dead  level best to do here. 

I got an email that had  a clip that said “A fear of weapons is a sign of retarded sexual and emotional  maturity.” Sigmund Freud. 

I have not seen gun  control work in any city or country. 

Jim  Addington 

     

 

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

Sent: Thursday, January 29, 2009 7:59  PM

To: 'art la  combe'

Subject: Commander-List:  FW: Amazing video

 

  

  

     	  Quote: 	
		           

BETTER BE    JUDGED BY 12 THAN CARRIED BY 6 - VERY BLUNT    CONCLUSION!!!



	
 

   



 The British  called - They want their rights back! 

http://au.youtube.co   m:80/watch?v=yTq2NEUlhDE 



    



  

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tfisher(at)commandergroup
Guest

Posted: Fri Jan 30, 2009 2:08 pm Post subject: Depressurizing a Commander

Keep me on this thread as I too would like to switch from  Skydrol.

 Tom

 C-GISS

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moe-rosspistons(at)hotmai
Guest

Posted: Fri Jan 30, 2009 3:20 pm Post subject: Depressurizing a Commander

Tom,

  

 I will keep you updated.  Sorry, but  I have forgotten what model Commander you fly.  Please  advise.

  

 Regards,

  

 Moe

  

  



  From: Tom Fisher (tfisher(at)commandergroup.bc.ca) 

 Sent: Friday, January 30, 2009 1:58 PM

 To: commander-list(at)matronics.com (commander-list(at)matronics.com)  

 Subject: Re: Depressurizing a  Commander

 



 Keep me on this thread as I too would like to switch from  Skydrol.

 Tom

 C-GISS

 [quote]   ---

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tfisher(at)commandergroup
Guest

Posted: Fri Jan 30, 2009 4:43 pm Post subject: Depressurizing a Commander

Thanks.

 680FLP (Mr.RPM)

 C-GISS is not currently pressurized as this was a survey  aircraft for 19 years.  In time I want to get a COOL AIR as  well.

 Tom.

  

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yourtcfg(at)aol.com
Guest

Posted: Sat Jan 31, 2009 10:10 am Post subject: Depressurizing a Commander

HI MOE.

 Yes, it has been done.  It is a simple matter of nuts & bolts.  Removing the press. system will however require a change in the heating system.  As for the switch to red fluid.  Yes that to has been done.  There is no paper work for that change, but we know of Commanders that have been changed.  Press. Commanders converted to the MR RPM engines use bleed air to press, but are still required to use skydrol.  I spoke with Dick Macoon about this a few years back and he confirmed that his STC does not allow for the change to red fluid.  i believe that the hi press pumps with the reducer must also be retained, but I am not certain.  There is no clear answer on the need to change all of the "O" rings in the system.  Morris K says absolutely, others say no, I cant say.  I would take a skdrol O ring and soak it in red fluid, if it stays the same size, OK.  If it grows, no good.  I believe it would require a 337 and field approval to make the change.  jb

 

 

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moe-rosspistons(at)hotmai
Guest

Posted: Sat Jan 31, 2009 3:33 pm Post subject: Depressurizing a Commander

Thanks, JB, I shall check up on  changing the pumps.  I would not feel very comfortable with the big (4,000  PSI rating) pumps and red fluid, given their tendancy for high pressure  leaks.  This, to me would be a fire hazard that I am not willing to  risk.

  

  Regards,



 Moe  



  From: yourtcfg(at)aol.com (yourtcfg(at)aol.com) 

 Sent: Saturday, January 31, 2009 9:59 AM

 To: commander-list(at)matronics.com (commander-list(at)matronics.com)  

 Subject: Re: Depressurizing a  Commander

 



HI MOE.

Yes, it has been done.  It is a simple  matter of nuts & bolts.  Removing the press. system will however  require a change in the heating system.  As for the switch to red  fluid.  Yes that to has been done.  There is no paper work for that  change, but we know of Commanders that have been changed.  Press.  Commanders converted to the MR RPM engines use bleed air to press, but are still  required to use skydrol.  I spoke with Dick Macoon about this a few years  back and he confirmed that his STC does not allow for the change to red  fluid.  i believe that the hi press pumps with the reducer must also be  retained, but I am not certain.  There is no clear answer on the need to  change all of the "O" rings in the system.  Morris K says absolutely,  others say no, I cant say.  I would take a skdrol O ring and soak it in red  fluid, if it stays the same size, OK.  If it grows, no good.  I  believe it would require a 337 and field approval to make the change.   jb

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kamala(at)msn.com
Guest

Posted: Sun Feb 01, 2009 9:06 am Post subject: Depressurizing a Commander

mm C commander aero converted my 680Fp to 5606.  MrRPM conversion.  it has been 5 years and no real problems C  bad o ring every so often.  talk to gary kromer about the change. gmc

  From: moe-rosspistons(at)hotmail.com

To: commander-list(at)matronics.com

Subject: Depressurizing a Commander

Date: Fri C 30 Jan 2009 11:04:18 -0800

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 Has anyone been involved in removing all of the pressurizing equipment in a commander (the one I have is a 680Fp) C changing the New York Air Brake Company hydraulic pumps back to normal pumps C and converting the Skydrol to red fluid?  One of the major expenses of maintaining the aircraft is the Pressurization system which requires the big pumps and Skydrol. C Since my flying missions have changed since retirement C certified known icing and pressurization are no longer absolute requirements.  Based on a past history of about the last 900 hours C removal of these two systems would cut maintenance cost more than 50%.  Also C the de-icing equipment weighs 70.2 pounds C and the pressurization optional (the 680Fp was not certified as a pressurized airplane) equipment weighs 89.5 pounds.  After removing this equipment I could then install a cool air (Freon) air conditioner C which would really be nice here in the New Mexico desert.

 Any and all comments will be greatly appreciated.

 Regards C

 Moe Mills

 N680RR

 680Fp

  From: Jim Addington (jtaddington(at)verizon.net) 

 Sent: Thursday C January 29 C 2009 8:16 PM

 To: commander-list(at)matronics.com (commander-list(at)matronics.com) 

 Subject: RE: FW: Amazing video

That is a good video and that is what the new leaders in this country are going to do there dead level best to do here. 

I got an email that had a clip that said “A fear of weapons is a sign of retarded sexual and emotional maturity.” Sigmund Freud. 

I have not seen gun control work in any city or country. 

Jim Addington 

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

Sent: Thursday C January 29 C 2009 7:59 PM

To: 'art la combe'

Subject: FW: Amazing video

     	  Quote: 	

BETTER BE JUDGED BY 12 THAN CARRIED BY 6 - VERY BLUNT CONCLUSION!!!

 The British called - They want their rights back! 

http://au.youtube.co  m:80/watch?v=yTq2NEUlhDE 

This e-mail message has been scanned for Viruses and Content and cleared by [b]MailMarshal[/b]

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Which stars will make the biggest headlines in 2009? Get Hollywood news C celebrity photos and more with the PopEater Toolbar. 

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