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Emergecy Air (Or Lack Of)

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rocknpilot(at)hotmail.com
Guest

Posted: Thu Oct 09, 2014 5:22 am Post subject: Emergecy Air (Or Lack Of)

Hi, All!



The Yaklist was unusually quiet this week, so I felt it my duty to increase it's usefulness... 

I don't know what's going on w/ my emergency air.  The Yak sat idle from about November to April (with regular and frequent prop turnings). Emergency air was...well...air-tight up until spring. Then I noticed it was leaking off as our thaw commenced. I thought...cold WI Winter...seals shrink / expand / become brittle. I did a retract test in Spring and both air sources operated the gear w/o issue. However, the emergency leak has gotten worse and worse - to the point of where I'm losing the entire load in 24 hours.  There is no audible hiss. I replaced O-rings in both emergency cockpit master valves and the top of the emergency bottle. I got a kit from Jill and redid the 1st check valve in-line from the external fill port. The year before I went through all 3 actuators / shuttle valves.  Main air is tighter than...(boy, it's tempting to be inappropriate here)...tighter than something that is VERY tight. I have 95% or better main air between starts and down time of better than a week. I did the bubble trick and only found a tiny leak at the top of the bottle, but - as previously stated - it is now sealed. Compared to the primary system, the emergency system is pretty straight forward, but...??? I don't know. Short of chocking the thing in the deep end of the school pool to see where the Jacuzzi action originates from, I'm out of ideas. Thoughts?

Thank you ALL!



Rico Jaeger

915 S. 11th Ave.                  

Wausau, WI. 54401     

715.529.7426                    

                                                                    //

1966 Cessna 150F                            ^/---//-X

N8558G                                                  //Hangar #35 / AUW

                                                  //               

1992 Yakovlev Yak 52    ^/---//-X

N21YK                                   //

Hangar #21 / AUW

                                          



 		 	   		  

  [quote][b]

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dsavarese0812(at)bellsout
Guest

Posted: Thu Oct 09, 2014 8:48 am Post subject: Emergecy Air (Or Lack Of)

With the emergency         air bottle filled, did you try spraying           soapy water on the external air fill port?  You can even put a           small dab of saliva on the port to see if there are any air           bubbles.  If there are air bubbles, the             emergency air                 check valve is leaking.  The check valve                       is located just inside the fuselage behind the                       external air fill port.

                         

                         Let me                             know what you find.

                                 Dennis

                                       	  Quote: 	
		  A. Dennis Savarese

334-546-8182 (mobile)

www.yak-52.com

Skype - Yakguy1 	
       On 10/9/2014 8:20 AM, Rico Jaeger wrote:

     

     [quote]              Hi, All!         

         

         The Yaklist was unusually quiet this week, so I felt it my           duty to increase it's usefulness... 

         

         

         I don't know what's going on w/ my emergency air.  The Yak           sat idle from about November to April (with regular and           frequent prop turnings). Emergency air was...well...air-tight           up until spring. Then I noticed it was leaking off as our thaw           commenced. I thought...cold WI Winter...seals shrink / expand           / become brittle. I did a retract test in Spring and both air           sources operated the gear w/o issue. However, the emergency           leak has gotten worse and worse - to the point of where I'm           losing the entire load in 24 hours.  There is no audible hiss.           I replaced O-rings in both emergency cockpit master valves and           the top of the emergency bottle. I got a kit from Jill and           redid the 1st check valve in-line from the external fill port.           The year before I went through all 3 actuators / shuttle           valves.  Main air is tighter than...(boy, it's tempting to be           inappropriate here)...tighter than something that is VERY           tight. I have 95% or better main air between starts and down           time of better than a week. I did the bubble trick and only           found a tiny leak at the top of the bottle, but - as           previously stated - it is now sealed. Compared to the primary           system, the emergency system is pretty straight forward,           but...??? I don't know. Short of chocking the thing in the           deep end of the school pool to see where the Jacuzzi action           originates from, I'm out of ideas. Thoughts?

         

         

         Thank you ALL!

           

           Rico Jaeger

           915 S. 11th Ave.                  

           Wausau, WI. 54401     

           715.529.7426                    

                                                                                         //

           1966 Cessna 150F                            ^/---//-X

           N8558G                                                  //           Hangar #35 / AUW

                                                                           //               

             1992 Yakovlev Yak 52    ^/---//-X

             N21YK                                   //

           Hangar #21 / AUW

                                                       

             

           

         

       

        	  Quote: 	
		  

	
     [b]

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Vic

Joined: 12 Aug 2008
Posts: 115
Location: Southern Bavaria

Posted: Fri Oct 10, 2014 3:20 pm Post subject: Re: Emergecy Air (Or Lack Of)

Rico,

donÂ´t forget to check the line from air tank to the pressure gauge in the cockpit. There is a length of hose that could be decades old and leaking. You will have a total loss of emergency air when that goes, no way to stop this in flight. This rubber hose is usually not in the set of hoses that get exchanged in periods. 



    Vic

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Adrian Coop Cooper

Joined: 02 Feb 2010
Posts: 37
Location: Vancouver, BC

Posted: Mon Oct 13, 2014 3:04 pm Post subject: Re: Emergecy Air (Or Lack Of)

Had a similar issue with my CJ-6A. So I bought an ultrasonic tester off of eBay, and using it found it was the pressure gauge in the rear cockpit that was leaking internally. I got a new one from Doug and the system stopped leaking. In fact, the entire community of Nanchangs, Yaks and Delphins at my home field have benefitted from my tester. Best yet it was reasonably priced on eBay. We still use the soapy water method first in case of obvious leaks and then use the ultrasonic when we can't find bubbles. Strongly recommended. Coop.

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_________________
Coop

Adrian Coop Cooper

Joined: 02 Feb 2010
Posts: 37
Location: Vancouver, BC

Posted: Mon Oct 13, 2014 3:12 pm Post subject: Re: Emergecy Air (Or Lack Of)

Had a similar issue with my CJ-6A. So I bought an ultrasonic tester off of eBay, and using it found it was the pressure gauge in the rear cockpit that was leaking internally. I got a new one from Doug and the system stopped leaking. In fact, the entire community of Nanchangs, Yaks and Delphins at my home field have benefitted from my tester. Best yet it was reasonably priced on eBay. We still use the soapy water method first in case of obvious leaks and then use the ultrasonic when we can't find bubbles. Strongly recommended. Coop.

- 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

_________________
Coop

Adrian Coop Cooper

Joined: 02 Feb 2010
Posts: 37
Location: Vancouver, BC

Posted: Mon Oct 13, 2014 3:13 pm Post subject: Re: Emergecy Air (Or Lack Of)

Had a similar issue with my CJ-6A. So I bought an ultrasonic tester off of eBay, and using it found it was the pressure gauge in the rear cockpit that was leaking internally. I got a new one from Doug and the system stopped leaking. In fact, the entire community of Nanchangs, Yaks and Delphins at my home field have benefitted from my tester. Best yet it was reasonably priced on eBay. We still use the soapy water method first in case of obvious leaks and then use the ultrasonic when we can't find bubbles. Strongly recommended. Coop.

- 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

_________________
Coop

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