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F16ftrplt(at)aol.com
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PostPosted: Tue Jul 25, 2006 8:58 am    Post subject: Flap Reply with quote
Need some pneumatic system troubleshooting help for CJ-6. 
 
With the Rear cockpit Flap handle in the neutral position, the front cockpit flap valve gets the flap down to only 10 degrees.
 
I tried operating the rear valve with the front in neutral and had the same results.  When I position the rear cockpit Flap handle in the UP position, I was able to operate the flap from the front cockpit to the FULL DOWN position. 
 
I have a CD with a very poor schematic of the pneumatic system.  Any ideas or help would be greatly appreciated
 
Thanks
 
Med Ragheb

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JBernier(at)dart.org
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PostPosted: Tue Jul 25, 2006 12:54 pm    Post subject: Flap Reply with quote
One of the two flap actuation valves are leaking across from the pressure side to the up side. That would explain the first situation. A stuck diverter valve would explain the second. Both happening at once is unlikely. If this were my problem I would start by taking the two output lines off each flap valve. Place the handles in neutral and turn on the air supply. Check for leakage in any of the output fittings. If air is leaking that valve needs to be machined or purchased new. New from Doug is my choice. If no air is leaking them take the diverter valves apart and clean. If these valve are dirty you may want to clean the flap valves as well. Be very careful not to scratch the faces of the flap valves. I have used high pressure vacuum grease to mate the two faces. Dow Corning makes vacuum grease. I don't know were to get it. A friend at a college chem lab got my jar.
With the lines off, check the operation of the flap handle.
Be very careful applying pressure when taking them apart. The flap valves are a very simple unit, but the machining is very close tolerance.
Jim B

Quote:
>> F16ftrplt(at)aol.com 07/25/06 11:57 AM >>>
Need some pneumatic system troubleshooting help for CJ-6.


With the Rear cockpit Flap handle in the neutral position, the front cockpit
flap valve gets the flap down to only 10 degrees.

I tried operating the rear valve with the front in neutral and had the same
results. When I position the rear cockpit Flap handle in the UP position, I
was able to operate the flap from the front cockpit to the FULL DOWN
position.

I have a CD with a very poor schematic of the pneumatic system. Any ideas
or help would be greatly appreciated

Thanks

Med Ragheb

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rvfltd(at)televar.com
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PostPosted: Tue Jul 25, 2006 2:28 pm    Post subject: Flap Reply with quote
Great Post Jim! This is why the list is a great resource. I did not know
about "high pressure vacuum grease". I'll do some searching and see what I
can find. The flap/gear valves can be a problem if your air filter system
is not kept in good condition. So one thing to add to your list of gear and
flap valve solutions is to check and maintain the desiccant filter, it's the
"lungs" of your air system, keep it clean and your flap valves will give you
good service. We are all used to "annual" servicing of the majority of our
aircraft, but the desiccant filter requires much more attention than what
you might think, especially if you are operating in hot and humid
conditions.

Always Yakin,
Doug Sapp

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viperdoc(at)mindspring.co
Guest
PostPosted: Tue Jul 25, 2006 3:36 pm    Post subject: Flap Reply with quote
Thanks for the advice Doug. I live in one of those hot humid environs and
have only been checking my air system at annuals.
Doc
Quote:
[Original Message]
From: doug sapp <rvfltd(at)televar.com>
To: <yak-list(at)matronics.com>
Date: 7/25/2006 5:38:18 PM
Subject: RE: Flap



Great Post Jim! This is why the list is a great resource. I did not know
about "high pressure vacuum grease". I'll do some searching and see what
I

Quote:
can find. The flap/gear valves can be a problem if your air filter system
is not kept in good condition. So one thing to add to your list of gear
and

Quote:
flap valve solutions is to check and maintain the desiccant filter, it's
the

Quote:
"lungs" of your air system, keep it clean and your flap valves will give
you

Quote:
good service. We are all used to "annual" servicing of the majority of
our

[quote] aircraft, but the desiccant filter requires much more attention than what
you might think, especially if you are operating in hot and humid
conditions.

Always Yakin,
Doug Sapp

--

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kelmonroe(at)comcast.net
Guest
PostPosted: Tue Jul 25, 2006 4:10 pm    Post subject: Flap Reply with quote
Med I saw your post and your pneumatic system filter had 11 hours on it when you and Ed test flew your CJ.  Thanks Kelley
[quote] ---

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dsavarese(at)elmore.rr.co
Guest
PostPosted: Wed Jul 26, 2006 4:51 am    Post subject: Flap Reply with quote
Roger,
Unlike the CJ, the Yak 52 only has one small air filter with is below the
pop-off valve on the firewall. With the exception of the felt compressor
filter and the aforementioned air filter, there really isn't much we can do
on the 52. Cleaning the "snot" bottle out periodically helps prevent the
goop from getting pushed back through the check valve and the air filter and
finally back into the main air tank. Quite frankly, I think the CJ has a
much better pneumatic filtering system.
Dennis

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