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Emergency air leaks down

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jonboede(at)hotmail.com
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Posted: Sat May 06, 2017 8:05 am Post subject: Emergency air leaks down

I have a CJ in which the emergency air system leaks to zero over the course of about four days. It used to hold air forever and there was no "event" (like opening an emergency air valve) that would have been a before/after deal. 



I've changed out all the one way air valves and hosed a lot of the system down with soapy water but so far nothing. 



Where would y'all go looking first for the culprit?



Jon

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Ernie

Joined: 11 Jan 2006
Posts: 513

Posted: Sat May 06, 2017 9:06 am Post subject: Emergency air leaks down

Check the needles in both the from and rear emergency valves, they tend to rust, this would cause however for air to bleed into your emergency circuit preventing your gear from going up, unless plane has been sitting for several days. The check valve on the top starboard side is the usual suspect, but that has to be coupled with either a leaky check valve on the other side or a leaky pop off valve.



On Sat, May 6, 2017 at 12:03 PM, Jon Boede <jonboede(at)hotmail.com (jonboede(at)hotmail.com)> wrote:

 	  Quote: 	
		  --> Yak-List message posted by: Jon Boede <jonboede(at)hotmail.com (jonboede(at)hotmail.com)>

 

 I have a CJ in which the emergency air system leaks to zero over the course of about four days. It used to hold air forever and there was no "event" (like opening an emergency air valve) that would have been a before/after deal.

 

 I've changed out all the one way air valves and hosed a lot of the system down with soapy water but so far nothing.

 

 Where would y'all go looking first for the culprit?

 

 Jon

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Vic

Joined: 12 Aug 2008
Posts: 116
Location: Southern Bavaria

Posted: Sat May 06, 2017 2:45 pm Post subject: Re: Emergency air leaks down

Did you check the hose to the manometer and the manometer itself ? We had a leak in this hose that was not changed for decades.



     Vic

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wlannon(at)shaw.ca
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Posted: Sat May 06, 2017 8:38 pm Post subject: Emergency air leaks down

Hi Jon;



A few years back one of our more industrious members (whose name, I'm sorry 

to say, escapes me) drew up a really excellent schematic of the CJ pneumatic 

system.

I will attach a copy in case you do not have it.

Note there are two distinct parts of the emergency system:  1.  Charging / 

Storage  (solid red) and 2. Operation (dashed red).   From your description 

I would suspect the problem is in part 1.

If you have not converted the control valves to Doug's stainless steel cones 

one (or both) valves could be leaking internally to the operation side. 

Other possibilities

are:----- Pin hole in tank wall or pipeline due to corrosion:  Poor 

connection to either pressure guage;  Charge line check valve leak (the one 

described by Ernie) also possibly internal.



If you have access to an ultrasonic leak detector that is probably the best 

way to pin it down.



Walt



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