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1. 05:27 PM - Re: Nitrogen Loss (Anthony Royal)
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| Subject: | Re: Nitrogen Loss |
Good idea Bill but if I can get the original part and bolt in, much easier
and faster. =C2-I was lucky, found NOS part in CR.
Anthony=C2-
On Sunday, March 27, 2016 12:52 AM, Bill Geipel <l129bs@gmail.com> wrot
e:
A schrader valve would prevent back flow.
Sent from my iPad
On Mar 27, 2016, at 08:08, Anthony Royal <skyking76t@verizon.net> wrote:
I would be interested too!
Found part of my leak problem.Removed the check valve that prevents nitroge
n from the Nitro bottles from flowing back out of bottles. The flare on the
check valve had a large burr,ridge on it. Not sure how that could have hap
pened. Smoothed it out ( yes I know you can't really repair because you alt
er the angle) and used some aircraft grade sealer made for sealing a damage
d flare and put back together for a test. Added 50 atm nitro last night and
still had 20 atm left over 24 hours later and was stable. =C2-May leak a
t higher pressure but it is a start. Also removed the nitrogen tank purge/d
rain valve. Packing nut was still a little loose and it looked to have a li
ttle something on the sealing seat. When I first tried to tighten in the pl
ane I got a significant increase in nitrogen pressure time. I'm working my
way back toward the cockpit. =C2-Checked the 2 connections at the brake v
alve beside the stick. All seems to be very tight.
Anybody have a new or good used check valve?=C2-
On Saturday, March 26, 2016 2:32 AM, Bill Geipel <l129bs@gmail.com> wro
te:
send description and pix.
On Mar 25, 2016, at 20:36, Jean de Roubin <delfin29@me.com> wrote:
I think the best way is an air compressor, working automatically at 20 bars
and stopping at 50.My, installed by the tzechs and approved by the factory
is perfectly working since 15 years. No need of ground support.Jean de Rou
bin
Envoy=C3=A9 de mon iPhone
Le 25 mars 2016 =C3- 19:58, Frank Deeth <tr.9@westnet.com.au> a =C3=A9cri
t=C2-:
Thanks Jorgen!
Sent from my iPhone
On 26 Mar 2016, at 6:50 AM, Jorgen Nielsen <jorgen.nielsen@mweb.co.za> wrot
e:
Mine is also done like that.=C2- I only posted half the story earlier, he
rewith then the full story=C2-J=C2-I don=99t use oxygen, so repur
posed the tanks.=C2-=C2-My oxygen tanks have a tap on them, close to th
e bottles, and a pressure gauge.=C2- The tap & gauge is situated in the n
ose compartment.My normal air bottle (N2) also have a tap on them, and a ga
uge, also in the nose compartment.=C2-So far, 2 separate systems.After th
e taps, they are interconnected via a T, output goes to the air system.=C2
-Benefits:Closing the valves means no leaks when she is standing.Having t
he 2 systems that close means I can go away for a weekend with no ground su
pport, or for example a 3 hop ferry I did a while back.=C2- At the destin
ation, close the active system.=C2- For the next flight, pick a system an
d open valve.=C2- When the system is empty use the next one.=C2-To fill
, if its just a normal flight from home base, I open the valve for whicheve
r system is in use, and fill normally.=C2- For extended flights, one can
fill one system at a time, or open both and fill both, then close one.=C2
-So far, completely trouble free for a number of years.=C2-I will have
to take some pics when at the airport.=C2- I used spare hand operated val
ves, similar to the pressure release inside the cockpit.=C2- I never did
the work myself, I have a Russian guy who does all my maintenance, I just d
reamt it up and asked him to do it.=C2-Another mod we did:=C2- my front
/ rear braking system has been reversed. =C2-I was once taxying with pax
, and asked them to hold the brake while I did something.=C2- On release,
when I took over, suddenly I had no brakes, and no steering obviously.=C2
- We almost went farming.=C2- In normal ops, the rear brake is for the
instructor, and held a certain way can disable the front cabin system.=C2
- Not good for how we operate them privately. =C2-=C2-=C2-=C2-Reg
ards to allJorgen=C2-From:=C2-owner-l29-list-server@matronics.com=C2-
[mailto:owner-l29-list-server@matronics.com]=C2-On Behalf Of=C2-Frank D
eeth
Sent:=C2-Friday, 25 March 2016 21:07
To:=C2-l29-list@matronics.com
Subject:=C2-Re: L29-List: Nitrogen Loss =C2-I read once about an L-29 b
eing operated in the UK where they disconnected the oxy system and plumbed
those bottles into the pneumatic system, almost doubles the capacity if I r
ecall...? Has anyone else looked at doing that? =C2-Frank
Sent from my iPad
On Mar 26, 2016, at 4:20 AM, Bill Culberson <bculberson@staraviation.com> w
rote:
Ultrasonic leak detector only works on the high pressure leaks (75-100 BAR)
, as it detects the specific audio signature of high pressure gas escaping.
Canopy seals and brakes are at lower pressures and the soap and water test
seems best.=C2-I don=99t use a Schrader valve but rather the origi
nal quarter turn valve but recently converted the N2 Cover to having a Schr
ader adapter =9Cjust in case=9D. My plane doesn=99t leak
much but discovered that with the cover changed and a good gasket the N2 co
ver that the N2 remains for weeks instead of days. Main check valve must be
leaking.=C2-I like the Hand valve at the tanks, what did you use? Pics?
=C2-BillN39DE=C2-From:=C2-owner-l29-list-server@matronics.com=C2-[m
ailto:owner-l29-list-server@matronics.com]=C2-On Behalf Of=C2-Jorgen Ni
elsen
Sent:=C2-Friday, March 25, 2016 2:52 AM
To:=C2-l29-list@matronics.com
Subject:=C2-RE: L29-List: Nitrogen Loss=C2-I also tried an ultrasonic l
eak detector, got a very expensive version on trial for a week from a speci
alty supplier.=C2- Could not find anything using it either.=C2- Soapy w
ater is messy but seems to work best.=C2-My air system is modified, with
a hand valve installed close to the bottles.=C2- When I am done flying, I
shut it off.=C2- Also nice if using the L29 to go somewhere, turn it off
after landing, turn it back on before flight, no losses.=C2-From:=C2-o
wner-l29-list-server@matronics.com=C2-[mailto:owner-l29-list-server@matro
nics.com]=C2-On Behalf Of=C2-Anthony Royal
Sent:=C2-Friday, 25 March 2016 02:17
To:=C2-l29-list@matronics.com
Subject:=C2-Re: L29-List: Nitrogen Loss=C2-Hey guys,Thanks for all your
suggestions! =C2-John, I did the soapy water test on every fitting I cou
ld find all the way back to the fittings for the emergency bottle and beyon
d. ...tightened too. No Joy.=C2-Bill, I think I did the top nut but misse
d the lower nut. I'll look at that next . Yeah, I'm 60 and a little too big
to get into that small of quarters.=C2-Hey Frank, thanks for the info to
o!=C2-I'm also looking at disconnecting the the main pressurizing line li
ne at the pressure reduction valve for the down stream items, after the nit
rogen bottles, and capping off the line and then pressurizing the bottles.
This should tell me if there is a leak anywhere upstream of the reduction v
alve in the main charging system. The emergency bottle holds pressure perfe
ctly so no problems there.=C2-According to the service manual, the minimu
m loss is 5 atm over 2 hours. So, I'm right on that limit at 2.5 atm per ho
ur.=C2-Thanks!Tony=C2-=C2-=C2-=C2-On Thursday, March 24, 2016 7:1
5 PM, John Cabrera <jetblast1@me.com> wrote:=C2-I don=9Dt know if t
his is going to be of any help and some may laugh at me but i was chasing a
t leak in the rear canopy. =C2-Bought a fancy ultrasonic leak detector an
d could not find any leak. =C2-Finally decided to check with old fashion
soapy water and a spray bottle. =C2-That worked. =C2-=C2-John=C2-
=C2-=C2-
On Mar 23, 2016, at 8:22 AM, Anthony Royal <skyking76t@verizon.net> wrote:
=C2-Guys, =C2-my L-29 has always held nitrogen for days without much lo
ss 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 c
ould get out of the hangar. =C2-And was totally empty the next day. I fou
nd several loose, original safety wired, connections not tight. Packing nut
on the nitrogen purge valve was loose too. Tightened every fitting and thi
ng I could find from nose to rear cockpit. =C2-=C2-Now, if I pressurize
to 50 atm, I will lose 30 atm in 12 hours. If I pressurize to 100 atm I lo
se 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? T
hinking maybe the pressure relief valve leaking? Check valve? =C2-Reading
manuals and reviewing diagrams but thought maybe someone else may have run
into this same problem and save a lot of time=C2-Someone, in a post I ca
n't find, suggested an ultrasonic tester of some sort to detect high pressu
re leaks. Does anyone know which one it was?=C2-Also, looking for the gla
ss lens for the taxi light. Rock must have hit mineand cracked it in half.
Glued it back but would like to replacement. =C2-Also looking for connect
or to ARC EA-401A encoding altimeter.=C2-Thanks for any info=C2-Anthony
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