Matronics Email Lists :: View topic

Matronics Email Lists
Web Forum Interface to the Matronics Email Lists

Get Email Distribution Too! FAQ Search Memberlist Usergroups Register

Profile Log in to check your private messages Log in

CJ Flap problem

Matronics Email Lists Forum Index -> Yak-List

View previous topic :: View next topic

Author Message

cjaviator(at)gmail.com
Guest

Posted: Thu Mar 13, 2008 11:41 am Post subject: CJ Flap problem

Hi all.

I have been having an intermittant flap problem as follows:

Occasionally when putting the flaps down they exptend partially and then stop. Air continues to vent from the front cockpit flap selector. It is almost like there is a leak across the actuator seals and the air load on the flap itself is equalising with the air across the actuator piston. 

  However, if the rear cockpit lever is selected down then the flaps work normally - full extension and no leaks. The flaps will then work normally with the front selector for a few extensions and then the original problem will occur again.

  Sometime ago I replaced both flap system shuttle valves and this cured the problem for some 12 months or so. Just recently I changed out the front flap selector, but this seems to have had no effect.

  So, where to now? I suspect the shuttle valves again, but getting the damn things apart is such a drama!

Any thoughts would be greatly appreciated. I do not believe the problem to be in the flap actuator itself.

 

Regards, Jay

New Zealand

  [quote][b]

- The Matronics Yak-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?Yak-List

dsavarese(at)elmore.rr.co
Guest

Posted: Thu Mar 13, 2008 12:21 pm Post subject: CJ Flap problem

Did you replace the rear cockpit flap selector?  If not,  I would seriously consider replacing it or having it properly overhauled.   Remember, with the rear flap selector in neutral, air pressure passes through  the rear selector to the front, giving control to the front selector.  If  the rear selector is leaking, even if it is in neutral, it will cause the air  pressure to bleed off going to the flap actuator.

 Dennis

  

 [quote]   ---

- The Matronics Yak-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?Yak-List

dougsappllc(at)gmail.com
Guest

Posted: Thu Mar 13, 2008 12:26 pm Post subject: CJ Flap problem

Jay,

 I have developed the tools to correctly disassemble both types of the diverter valves without breaking them or crushing the bodies out of round.  Most of the div valve problems I have seen stem from rusty springs, out of round due to crushing during disasembly, and of course just plain old gunk in the air system binding up the shuttle.  

   

 You are correct, about the "drama", and until I built the proper tooling I destroyed a few myself.  Send me your valves and I will overhaul them with new shuttles, seals and the new style stainless steel springs.  Note that I now also have stainless steel springs for the check valves.

   

 If your pneumatic system is clean and you are maintaining your desiccant filter, the new overhauled valves with stainless springs should last a long long time.  However if your system is full of gunk, no amount of overhauling is going to help you much long term until you get it 100% cleaned out.  

   

 I also doubt that your problem is in your actuator, or the cockpit valve (QSF2A).  If you have loose gunk moving in your system you might just have a plugged air line restrictor, but my first choice would be to look at the div valve if that fixed the problem last time.

   

 Good luck,

 

 

 On Thu, Mar 13, 2008 at 12:37 PM, Jay McIntyre <cjaviator(at)gmail.com (cjaviator(at)gmail.com)> wrote:

  	  Quote: 	
		   Hi all.

I have been having an intermittant flap problem as follows:

Occasionally when putting the flaps down they exptend partially and then stop. Air continues to vent from the front cockpit flap selector. It is almost like there is a leak across the actuator seals and the air load on the flap itself is equalising with the air across the actuator piston. 

  However, if the rear cockpit lever is selected down then the flaps work normally - full extension and no leaks. The flaps will then work normally with the front selector for a few extensions and then the original problem will occur again.

  Sometime ago I replaced both flap system shuttle valves and this cured the problem for some 12 months or so. Just recently I changed out the front flap selector, but this seems to have had no effect.

 So, where to now? I suspect the shuttle valves again, but getting the damn things apart is such a drama!

Any thoughts would be greatly appreciated. I do not believe the problem to be in the flap actuator itself.

 

Regards, Jay

New Zealand

 	  Quote: 	
		  

	
	


-- 

Always Yakin,

Doug Sapp

Phone 509-826-4610

Fax 509-826-3644   [quote][b]

- The Matronics Yak-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?Yak-List

Display posts from previous:

	Matronics Email Lists Forum Index -> Yak-List	All times are GMT - 8 Hours
Page 1 of 1

Jump to:

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum