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Thanks for the help

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hcourier(at)cox.net
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Posted: Mon May 21, 2007 4:44 am Post subject: Thanks for the help

Hello Everyone,

  

     I recently posted a message seeking help with an engine  RPM problem with the Aero Commander 680 FLP that I fly.  I was having  problems with the engine RPM dropping 100, 200, 300 or so RPM particularly  during climb, in a random fashion.  I had about six different replies and  suggestions as to the problem.  Prior to finding the problem maintenance  had checked out some of the suggestions to no avail;  prop governor  and magneto were #1 suspect but were not the problem.  

  

     Well, the problem turned out to be a crack in the upper  deck air line.  That particular line had been removed and the rubber hose  portions had been replaced during the annual.  Evidently the maintenance  guy didn't look at the line close enough or the line may not have been  completely removed and the crack couldn't be seen.  Anyway, the crack was  repaired and the engine hasn't blinked since.  

  

     Thanks to everyone for the ideas.  I relayed all of  the comments to our maintenance people.  They appreciated all the ideas as  for a while we were really baffled.  

  

 Ray Mansfield

 N91ES 

 Aero Commander 680 FLP

    [quote][b]

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tylor.hall(at)sbcglobal.n
Guest

Posted: Mon May 21, 2007 8:06 am Post subject: Thanks for the help

Ray,Those upper deck lines are small and often overlooked on the Rajay Turbo conversions, both 8 cylinder and 6 cylinder.  A little crack will cause funny problems.



The upper deck lines do not exist on Supercharger or normally aspirated aircraft.



Happy flying.



Tylor Hall

On May 21, 2007, at 6:43 AM, Ray Mansfield wrote:

 	  Quote: 	
		  Hello Everyone,

 

    I recently posted a message seeking help with an engine RPM problem with the Aero Commander 680 FLP that I fly.  I was having problems with the engine RPM dropping 100, 200, 300 or so RPM particularly during climb, in a random fashion.  I had about six different replies and suggestions as to the problem.  Prior to finding the problem maintenance had checked out some of the suggestions to no avail;  prop governor and magneto were #1 suspect but were not the problem. 

 

    Well, the problem turned out to be a crack in the upper deck air line.  That particular line had been removed and the rubber hose portions had been replaced during the annual.  Evidently the maintenance guy didn't look at the line close enough or the line may not have been completely removed and the crack couldn't be seen.  Anyway, the crack was repaired and the engine hasn't blinked since. 

 

    Thanks to everyone for the ideas.  I relayed all of the comments to our maintenance people.  They appreciated all the ideas as for a while we were really baffled. 

 

Ray Mansfield

N91ES

Aero Commander 680 FLP

 	  Quote: 	
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 Tylor Hall

tylor.hall(at)sbcglobal.net (tylor.hall(at)sbcglobal.net)



 

 [quote][b]

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bowing74(at)earthlink.net
Guest

Posted: Mon May 21, 2007 9:29 am Post subject: Thanks for the help

I’ll bet it was a pricey crack too.  

bilbo  

         

  

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

 Sent: Monday, May 21, 2007 8:44 AM

 To: commander-list(at)matronics.com

 Subject: Thanks for the help  

  

     

Hello Everyone,  

    

   

    

    I recently posted a message seeking help with an engine RPM problem with the Aero Commander 680 FLP that I fly.  I was having problems with the engine RPM dropping 100, 200, 300 or so RPM particularly during climb, in a random fashion.  I had about six different replies and suggestions as to the problem.  Prior to finding the problem maintenance had checked out some of the suggestions to no avail;  prop governor and magneto were #1 suspect but were not the problem.    

    

   

    

    Well, the problem turned out to be a crack in the upper deck air line.  That particular line had been removed and the rubber hose portions had been replaced during the annual.  Evidently the maintenance guy didn't look at the line close enough or the line may not have been completely removed and the crack couldn't be seen.  Anyway, the crack was repaired and the engine hasn't blinked since.    

    

   

    

    Thanks to everyone for the ideas.  I relayed all of the comments to our maintenance people.  They appreciated all the ideas as for a while we were really baffled.    

    

   

    

Ray Mansfield  

    

N91ES   

    

Aero Commander 680 FLP  

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       [quote][b]

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floydgm(at)hotmail.com
Guest

Posted: Mon May 21, 2007 4:18 pm Post subject: Thanks for the help

With MR RPM's blessing we have fabricated ours from 302 seamless tubing. I 

would provide a set of drawings if you would like.



Mike Floyd

Northern Commanders LLC



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hcourier(at)cox.net
Guest

Posted: Mon May 21, 2007 6:12 pm Post subject: Thanks for the help

Yes, if you consider all the things we did prior to finding the  crack.  

  

 RM

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