---------------------------------------------------------- L29-List Digest Archive --- Total Messages Posted Wed 03/23/16: 4 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 10:26 AM - Nitrogen Loss (Anthony Royal) 2. 06:19 PM - Re: Nitrogen Loss (Frank Deeth) 3. 06:22 PM - Re: Nitrogen Loss (Bill Geipel) 4. 08:19 PM - Re: Nitrogen Loss (Bill Culberson) ________________________________ Message 1 _____________________________________ Time: 10:26:37 AM PST US From: Anthony Royal Subject: L29-List: Nitrogen Loss Guys, =C2-my L-29 has always held nitrogen for days without much loss of pressure. Other day I pressurized to 140 atm because of a long flight and d ay. Pressure bled off immediately from 140 to about 90 atm before I could g et out of the hangar. =C2-And was totally empty the next day. I found sev eral loose, original safety wired, connections not tight. Packing nut on th e nitrogen purge valve was loose too. Tightened every fitting and thing I c ould find from nose to rear cockpit. =C2- Now, if I pressurize to 50 atm, I will lose 30 atm in 12 hours. If I pressu rize to 100 atm I lose 30 atm in 12 hours. Very consistent now. =C2-That' s about 2.5 atm per hour. =C2-Any suggestions what else might cause such a consistent leak? Thinking maybe the pressure relief valve leaking? Check valve? =C2-Reading manuals and reviewing diagrams but thought maybe someo ne else may have run into this same problem and save a lot of time Someone, in a post I can't find, suggested an ultrasonic tester of some sor t to detect high pressure leaks. Does anyone know which one it was? Also, looking for the glass lens for the taxi light. Rock must have hit min eand cracked it in half. Glued it back but would like to replacement. =C2 -Also looking for connector to ARC EA-401A encoding altimeter. Thanks for any info Anthony ________________________________ Message 2 _____________________________________ Time: 06:19:47 PM PST US From: Frank Deeth Subject: Re: L29-List: Nitrogen Loss Anthony, The post about the ultra sonic tester was, I think, originally to do with th e thread about the electric air pump system installed in the nose section an d used to pump up the pneumatic system as required. I think the jet was/is b ased in Sweden or Norway? FWIW I think I saw recently that jet is now for sa le too? Cheers, Frank Sent from my iPad > On Mar 24, 2016, at 2:22 AM, Anthony Royal wrote: > > Guys, my L-29 has always held nitrogen for days without much loss of pres sure. Other day I pressurized to 140 atm because of a long flight and day. P ressure bled off immediately from 140 to about 90 atm before I could get out of the hangar. And was totally empty the next day. I found several loose, o riginal safety wired, connections not tight. Packing nut on the nitrogen pur ge valve was loose too. Tightened every fitting and thing I could find from n ose to rear cockpit. > > Now, if I pressurize to 50 atm, I will lose 30 atm in 12 hours. If I press urize to 100 atm I lose 30 atm in 12 hours. Very consistent now. That's abo ut 2.5 atm per hour. Any suggestions what else might cause such a consisten t leak? Thinking maybe the pressure relief valve leaking? Check valve? Read ing manuals and reviewing diagrams but thought maybe someone else may have r un into this same problem and save a lot of time > > Someone, in a post I can't find, suggested an ultrasonic tester of some so rt to detect high pressure leaks. Does anyone know which one it was? > > Also, looking for the glass lens for the taxi light. Rock must have hit mi neand cracked it in half. Glued it back but would like to replacement. Also looking for connector to ARC EA-401A encoding altimeter. > > Thanks for any info > > Anthony ________________________________ Message 3 _____________________________________ Time: 06:22:48 PM PST US From: Bill Geipel Subject: Re: L29-List: Nitrogen Loss Remove the front seat and the floor boards to the left of the stick and the stick boot. 2 Brake valves on the left. Check the lower one that is hardest to get to. 19mm. good luck. need a small, bent, twisted wrench. On Mar 23, 2016, at 9:22, Anthony Royal wrote: > Guys, my L-29 has always held nitrogen for days without much loss of pressure. Other day I pressurized to 140 atm because of a long flight and day. Pressure bled off immediately from 140 to about 90 atm before I could get out of the hangar. And was totally empty the next day. I found several loose, original safety wired, connections not tight. Packing nut on the nitrogen purge valve was loose too. Tightened every fitting and thing I could find from nose to rear cockpit. > > Now, if I pressurize to 50 atm, I will lose 30 atm in 12 hours. If I pressurize to 100 atm I lose 30 atm in 12 hours. Very consistent now. That's about 2.5 atm per hour. Any suggestions what else might cause such a consistent leak? Thinking maybe the pressure relief valve leaking? Check valve? Reading manuals and reviewing diagrams but thought maybe someone else may have run into this same problem and save a lot of time > > Someone, in a post I can't find, suggested an ultrasonic tester of some sort to detect high pressure leaks. Does anyone know which one it was? > > Also, looking for the glass lens for the taxi light. Rock must have hit mineand cracked it in half. Glued it back but would like to replacement. Also looking for connector to ARC EA-401A encoding altimeter. > > Thanks for any info > > Anthony ________________________________ Message 4 _____________________________________ Time: 08:19:36 PM PST US From: Bill Culberson Subject: RE: L29-List: Nitrogen Loss The valve Bill is talking about is the one I had a problem with. Find a sma ll guy that's good with tools. In my case, fitting was loose...tightened an d all was well. Bill N39DE Sent from my T-Mobile 4G LTE Device -------- Original message -------- From: Bill Geipel Subject: Re: L29-List: Nitrogen Loss Remove the front seat and the floor boards to the left of the stick and the stick boot. 2 Brake valves on the left. Check the lower one that is hardest to get to. 19mm. good luck. need a small, bent, twisted wre nch. On Mar 23, 2016, at 9:22, Anthony Royal > wrote: Guys, my L-29 has always held nitrogen for days without much loss of press ure. Other day I pressurized to 140 atm because of a long flight and day. P ressure bled off immediately from 140 to about 90 atm before I could get ou t of the hangar. And was totally empty the next day. I found several loose , original safety wired, connections not tight. Packing nut on the nitrogen purge valve was loose too. Tightened every fitting and thing I could find from nose to rear cockpit. Now, if I pressurize to 50 atm, I will lose 30 atm in 12 hours. If I pressu rize to 100 atm I lose 30 atm in 12 hours. Very consistent now. That's abo ut 2.5 atm per hour. Any suggestions what else might cause such a consiste nt leak? Thinking maybe the pressure relief valve leaking? Check valve? Re ading manuals and reviewing diagrams but thought maybe someone else may hav e run into this same problem and save a lot of time Someone, in a post I can't find, suggested an ultrasonic tester of some sor t to detect high pressure leaks. Does anyone know which one it was? Also, looking for the glass lens for the taxi light. Rock must have hit min eand cracked it in half. Glued it back but would like to replacement. Also looking for connector to ARC EA-401A encoding altimeter. Thanks for any info Anthony ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message l29-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/L29-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/l29-list Browse Digests http://www.matronics.com/digest/l29-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.