Today's Message Index:
----------------------
1. 03:33 AM - Re: Air Leak (Rob Rowe)
2. 04:46 AM - Re: Air Leak (A. Dennis Savarese)
3. 04:54 AM - Re: Air Leak (Herb Coussons)
4. 05:18 AM - Re: Air Leak (Rico Jaeger)
5. 05:25 AM - Re: Air Leak (ssssskippy)
6. 05:32 AM - Re: Air Leak (George Coy)
7. 05:36 AM - Re: Air Leak (A. Dennis Savarese)
8. 05:42 AM - Re: Air Leak (A. Dennis Savarese)
9. 05:58 AM - Re: Air Leak (George Coy)
10. 06:10 AM - Re: Air Leak (Rico Jaeger)
11. 06:14 AM - Re: Air Leak (A. Dennis Savarese)
12. 06:30 AM - Re: Air Leak (Rico Jaeger)
13. 06:49 AM - Re: Air Leak (Rob Rowe)
14. 09:44 AM - Re: Re: Air Leak (A. Dennis Savarese)
15. 10:19 AM - Re: Air Leak (Brian Lloyd)
16. 10:34 AM - Re: Air Leak (Rico Jaeger)
17. 11:01 AM - Re: Air Leak (delfin)
18. 11:33 AM - Re: Air Leak (A. Dennis Savarese)
19. 11:49 AM - Re: Air Leak (Rico Jaeger)
20. 01:14 PM - Re: Air Leak (A. Dennis Savarese)
21. 01:22 PM - Re: Air Leak (Rico Jaeger)
Message 1
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Rico,
It's possible the emergency air test itself has stressed a seal or similar in your
air system, as it uses the full air pressure without restriction. If anything
is getting near to its limits then this test is the most likely to finally
break it.
>From your description it appears that the emergency protection valve (under the
front seat) is doing its job ok - to vent the emergency system after use and
to allow small leaks to dissipate. Bigger leaks, or full on emergency air use,
shuts the valve above 5 kgf/cm2. So the fact that you're hearing this valve
vent identifies that we're dealing with a relatively small, if noisy, leak.
Air leaking into the emergency system (on a -52) can come from a number of sources,
so let's work through these and try to eliminate them by some simple checks
where we can;
1 - Emergency Air Cocks
One per cockpit plumbed in parallel so either one not sealing can leak air into
the system. As the -52 does not have the emergency air system recharged by the
engine air compressor then if one of these cocks is seeping then the emergency
air pressure will progressively drop. So is your -52 emergency air gauge giving
a constant reading over time or is it dropping down? (Assuming it wasn't
doing this before this latest issue arose)
2 - Brake Emergency Non-Return Valve (NRV)
The emergency air system feeds the brakes via a NRV that's tee'd with a similar
feed from the main air system, before it gets to the common brake actuator valve.
If the emergency NRV is leaking then air from the main system can bleed into
the emergency system. This only requires the main air to be on and it doesn't
matter whether the downstream brake lever is operated or not.
There is a simple test here but it requires some caution! With the main air OFF,
carefully select BOTH cockpit gear selectors to NEUTRAL - this isolates the
main air feed into the gear system and vents it. Open the main air cock and if
you still get air hissing from the emergency protection valve then it's probably
the brake emergency NRV that's the culprit. Don't forget to reselect (at least
the front) gear selectors down again once you've finished this test!
3 - Up-Lock Release
The emergency air system feeds each of the 3 gear up-lock releases in between the
two pistons inside each device (independently operating one on top of the other).
Such that if the main air fed first piston fails/seizes then the second
piston might still be operated via emergency air. Hence it's possible that if
the first piston seal is seeping air (seal deterioration or cylinder corrosion)
then main air might leak into the emergency system when the gear is down. No
simple check here, all you can do is use your leak detector to try and pick
up the sound of the leak around (one of) the up-lock release mechanisms.
4 - Shuttle Valves
The emergency air system feeds each of the 3 gear shuttle valves (each with a main
& emergency air feed, with a common output to the gear actuator), such that
the hard rubber 'pea' inside shuttles to block off the lowest pressure air feed
port. So the pea tends to spend much of its life blocking the emergency air
feed port off, until disturbed by an emergency gear activation. Consequently
it ends up being slightly distorted and over time perishes, either way there's
no guarantee than once disturbed it will re-seat properly again. Hence this
could be another (and probably most likely) source of main air bleed into the
emergency system. No simple checks here either other than, as you've already done,
using your leak detector. Although as these are not external leaks then any
highly directional ultrasound produced is going to be muffled by the internal
plumbing.
Anyway hope the above at least allows you to eliminate some of the potential causes
of your leak ... I'll leave it to the experienced hands-on engineers to advise
on the easiest way to rectify what you discover.
Rob R
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=382361#382361
Message 2
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Rico,
Most likely the valve you speak of is corroded inside and won't reset or shut
off as it is suppose to do. You most likely will have to replace it. I
personally have never tried disassembling one. But I guess it is possible.
Either way, it will need to be removed.
Dennis
________________________________
From: Rico Jaeger <rijaeger@wausau.k12.wi.us>
Sent: Mon, September 3, 2012 10:16:38 PM
Subject: Re: Yak-List: Air Leak
Yes - zero'd both the primary and emergency systems.
Thank you for your response!
On Mon, Sep 3, 2012 at 9:50 PM, Jon Boede <jonboede@hotmail.com> wrote:
Have you completely drained both air systems? I'm more familiar with the CJ but
I recall that the Yak system has to be completely drained before it will switch
back over from the emergency system.
>
>
________________________________
>Subject: Yak-List: Air Leak
>From: rijaeger@wausau.k12.wi.us
>To: yak-list@matronics.com
>
>
>Greetings All! A while back my Yak 52 was test flown and at one point, the
>emergency air was opened. Now the air system is reluctant to switch back over
to
>the primary system and there's an audible hiss from the relief valve immediately
>below the front seat / right side every time I open up the main air valve after
>recharging. This valve has a large escape hole on top and if I seal it w/ my
>thumb it seems to close the system and all is back to normal.
>Unfortunately, everytime I open the master valve I go back to square one w/ this
>process. I was told by one source that one of my actuator shuttle valves is
>malfunctioning. But which one? I purchased an ultrasonic listening device in an
>attempt to trace down the source of the leaks. In "tapping" lines on all 3 gear,
>the audible leak seems to resonate through all lines. It DOES seem to be
>noticably-louder on the nose gear line - or is this simply because that point
is
>physically-closer to the floor-mounted escape valve? What do I do next? Anyone
>w/ experience in this area would be a welcome sight on my screen. Thank you for
>your assistance and patience, guys!
>
> rget="_blank">http://www.matronics.com/Navigator?Yak-List
>http://forums.matronics.com ="_blank">http://www.matronics.com/contribution
>
> et="_blank">http://www.matronics.com/Navigator?Yak-List
>tp://forums.matronics.com _blank">http://www.matronics.com/contribution
>
Message 3
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Rico. Call me and I'll explain.
Sent from DrC@wscare.com on the iPhone. Please excuse spelling and autocorre
ct. Siri makes mistakes :).
On Sep 3, 2012, at 8:17 PM, Rico Jaeger <rijaeger@wausau.k12.wi.us> wrote:
> Greetings All! A while back my Yak 52 was test flown and at one point, the
emergency air was opened. Now the air system is reluctant to switch back ov
er to the primary system and there's an audible hiss from the relief valve i
mmediately below the front seat / right side every time I open up the main a
ir valve after recharging. This valve has a large escape hole on top and if I
seal it w/ my thumb it seems to close the system and all is back to normal.
Unfortunately, everytime I open the master valve I go back to square one w/
this process. I was told by one source that one of my actuator shuttle valv
es is malfunctioning. But which one? I purchased an ultrasonic listening dev
ice in an attempt to trace down the source of the leaks. In "tapping" lines o
n all 3 gear, the audible leak seems to resonate through all lines. It DOES s
eem to be noticably-louder on the nose gear line - or is this simply because
that point is physically-closer to the floor-mounted escape valve? What do I
do next? Anyone w/ experience in this area would be a welcome sight on my s
creen. Thank you for your assistance and patience, guys!
>
>
==========================
=========
==========================
=========
==========================
=========
==========================
=========
>
Message 4
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Replace the nose gear actuator?
On Tue, Sep 4, 2012 at 6:42 AM, A. Dennis Savarese <
dsavarese0812@bellsouth.net> wrote:
> Rico,
> Most likely the valve you speak of is corroded inside and won't reset or
> shut off as it is suppose to do. You most likely will have to replace it.
> I personally have never tried disassembling one. But I guess it is
> possible. Either way, it will need to be removed.
> Dennis
>
> ------------------------------
> *From:* Rico Jaeger <rijaeger@wausau.k12.wi.us>
> *To:* yak-list@matronics.com
> *Sent:* Mon, September 3, 2012 10:16:38 PM
> *Subject:* Re: Yak-List: Air Leak
>
> Yes - zero'd both the primary and emergency systems.
>
> Thank you for your response!
>
> On Mon, Sep 3, 2012 at 9:50 PM, Jon Boede <jonboede@hotmail.com> wrote:
>
>> Have you completely drained both air systems? I'm more familiar with
>> the CJ but I recall that the Yak system has to be completely drained before
>> it will switch back over from the emergency system.
>>
>> ------------------------------
>> Date: Mon, 3 Sep 2012 20:17:26 -0500
>> Subject: Yak-List: Air Leak
>> From: rijaeger@wausau.k12.wi.us
>> To: yak-list@matronics.com
>>
>>
>> Greetings All! A while back my Yak 52 was test flown and at one point,
>> the emergency air was opened. Now the air system is reluctant to switch
>> back over to the primary system and there's an audible hiss from the relief
>> valve immediately below the front seat / right side every time I open up
>> the main air valve after recharging. This valve has a large escape hole on
>> top and if I seal it w/ my thumb it seems to close the system and all is
>> back to normal. Unfortunately, everytime I open the master valve I go back
>> to square one w/ this process. I was told by one source that one of my
>> actuator shuttle valves is malfunctioning. But which one? I purchased an
>> ultrasonic listening device in an attempt to trace down the source of
>> the leaks. In "tapping" lines on all 3 gear, the audible leak seems to
>> resonate through all lines. It DOES seem to be noticably-louder on the nose
>> gear line - or is this simply because that point is physically-closer to
>> the floor-mounted escape valve? What do I do next? Anyone w/ experience in
>> this area would be a welcome sight on my screen. Thank you for your
>> assistance and patience, guys!
>>
>> *
>>
>> rget="_blank">http://www.matronics.com/Navigator?Yak-Listhttp://forums.matronics.com
>> ="_blank">http://www.matronics.com/contribution
>> *
>>
>> *
>>
>> et="_blank">http://www.matronics.com/Navigator?Yak-List
>> tp://forums.matronics.com
>> _blank">http://www.matronics.com/contribution
>> *
>>
>>
> *
>
> *
>
> *
>
> *
>
>
Message 5
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Hi all
During my last annual (yak52) the emergency releaf valve was stuck due to ex
ces of water In the air circuit.
I had some difficulty to unscrew the valve but it is possible.
After cleaning the valve was running as a new one.
Olivier V
Le 4 sept. 2012 =C3- 13:42, "A. Dennis Savarese" <dsavarese0812@bellsouth.
net> a =C3=A9crit :
> Rico,
> Most likely the valve you speak of is corroded inside and won't reset or s
hut off as it is suppose to do. You most likely will have to replace it. I
personally have never tried disassembling one. But I guess it is possible.
Either way, it will need to be removed.
> Dennis
>
> From: Rico Jaeger <rijaeger@wausau.k12.wi.us>
> To: yak-list@matronics.com
> Sent: Mon, September 3, 2012 10:16:38 PM
> Subject: Re: Yak-List: Air Leak
>
> Yes - zero'd both the primary and emergency systems.
>
> Thank you for your response!
>
> On Mon, Sep 3, 2012 at 9:50 PM, Jon Boede <jonboede@hotmail.com> wrote:
> Have you completely drained both air systems? I'm more familiar with the C
J but I recall that the Yak system has to be completely drained before it wi
ll switch back over from the emergency system.
>
> Date: Mon, 3 Sep 2012 20:17:26 -0500
> Subject: Yak-List: Air Leak
> From: rijaeger@wausau.k12.wi.us
> To: yak-list@matronics.com
>
>
> Greetings All! A while back my Yak 52 was test flown and at one point, the
emergency air was opened. Now the air system is reluctant to switch back ov
er to the primary system and there's an audible hiss from the relief valve i
mmediately below the front seat / right side every time I open up the main a
ir valve after recharging. This valve has a large escape hole on top and if I
seal it w/ my thumb it seems to close the system and all is back to normal.
Unfortunately, everytime I open the master valve I go back to square one w/
this process. I was told by one source that one of my actuator shuttle valv
es is malfunctioning. But which one? I purchased an ultrasonic listening dev
ice in an attempt to trace down the source of the leaks. In "tapping" lines o
n all 3 gear, the audible leak seems to resonate through all lines. It DOES s
eem to be noticably-louder on the nose gear line - or is this simply because
that point is physically-closer to the floor-mounted escape valve? What do I
do next? Anyone w/ experience in this area would be a welcome sight on my s
creen. Thank you for your assistance and patience, guys!
>
>
> rget="_blank">http://www.matronics.com/Navigator?Yak-List
> http://forums.matronics.com
> ="_blank">http://www.matronics.com/contribution
>
>
>
> et="_blank">http://www.matronics.com/Navigator?Yak-List
> tp://forums.matronics.com
> _blank">http://www.matronics.com/contribution
>
>
>
>
>
>
>
==========================
=========
==========================
=========
==========================
=========
==========================
=========
>
Message 6
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Rico, The shuttle valves are the probably the problem. Disconnect the nose
emergency line and see if air comes out the line or the valve. If the line
then repeat with one of the landing gear. The shuttle valves are nothing
more than two lines into the top of a "T". the bottom of the "T" goes to the
actuator. There is a little rubber ball that shuttles back and forth in the
top of the "T". They become hard and deformed over the years and when you
use the emergency gear then the deformed ball does not seat the appropriate
side of the "T" and thus the leak. We have some of the rubber balls if
necessary. Jill has the kits to reseal the whole assembly.
George
From: owner-yak-list-server@matronics.com
[mailto:owner-yak-list-server@matronics.com] On Behalf Of Rico Jaeger
Sent: Tuesday, September 04, 2012 8:16 AM
Subject: Re: Yak-List: Air Leak
Replace the nose gear actuator?
On Tue, Sep 4, 2012 at 6:42 AM, A. Dennis Savarese
<dsavarese0812@bellsouth.net> wrote:
Rico,
Most likely the valve you speak of is corroded inside and won't reset or
shut off as it is suppose to do. You most likely will have to replace it.
I personally have never tried disassembling one. But I guess it is
possible. Either way, it will need to be removed.
Dennis
_____
From: Rico Jaeger <rijaeger@wausau.k12.wi.us>
Sent: Mon, September 3, 2012 10:16:38 PM
Subject: Re: Yak-List: Air Leak
Yes - zero'd both the primary and emergency systems.
Thank you for your response!
On Mon, Sep 3, 2012 at 9:50 PM, Jon Boede <jonboede@hotmail.com> wrote:
Have you completely drained both air systems? I'm more familiar with the CJ
but I recall that the Yak system has to be completely drained before it will
switch back over from the emergency system.
_____
Subject: Yak-List: Air Leak
From: rijaeger@wausau.k12.wi.us
Greetings All! A while back my Yak 52 was test flown and at one point, the
emergency air was opened. Now the air system is reluctant to switch back
over to the primary system and there's an audible hiss from the relief valve
immediately below the front seat / right side every time I open up the main
air valve after recharging. This valve has a large escape hole on top and if
I seal it w/ my thumb it seems to close the system and all is back to
normal. Unfortunately, everytime I open the master valve I go back to square
one w/ this process. I was told by one source that one of my actuator
shuttle valves is malfunctioning. But which one? I purchased an ultrasonic
listening device in an attempt to trace down the source of the leaks. In
"tapping" lines on all 3 gear, the audible leak seems to resonate through
all lines. It DOES seem to be noticably-louder on the nose gear line - or is
this simply because that point is physically-closer to the floor-mounted
escape valve? What do I do next? Anyone w/ experience in this area would be
a welcome sight on my screen. Thank you for your assistance and patience,
guys!
rget="_blank">http://www.matronics.com/Navigator?Yak-List
http://forums.matronics.com <http://forums.matronics.com/>
="_blank">http://www.matronics.com/contribution
et="_blank">http://www.matronics.com/Navigator?Yak-List
tp://forums.matronics.com <http://forums.matronics.com/>
_blank">http://www.matronics.com/contribution
et="_blank">http://www.matronics.com/Navigator?Yak-List
ttp://forums.matronics.com
_blank">http://www.matronics.com/contribution
Message 7
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No, the valve under the seat on the right side with a large hex head and a hole
in the middle.
Dennis
________________________________
From: Rico Jaeger <rijaeger@wausau.k12.wi.us>
Sent: Tue, September 4, 2012 7:18:56 AM
Subject: Re: Yak-List: Air Leak
Replace the nose gear actuator?
On Tue, Sep 4, 2012 at 6:42 AM, A. Dennis Savarese <dsavarese0812@bellsouth.net>
wrote:
Rico,
>Most likely the valve you speak of is corroded inside and won't reset or shut
>off as it is suppose to do. You most likely will have to replace it. I
>personally have never tried disassembling one. But I guess it is possible.
>Either way, it will need to be removed.
>Dennis
>
>
________________________________
From: Rico Jaeger <rijaeger@wausau.k12.wi.us>
>To: yak-list@matronics.com
>Sent: Mon, September 3, 2012 10:16:38 PM
>Subject: Re: Yak-List: Air Leak
>
>
>
>Yes - zero'd both the primary and emergency systems.
>
>Thank you for your response!
>
>
>On Mon, Sep 3, 2012 at 9:50 PM, Jon Boede <jonboede@hotmail.com> wrote:
>
>Have you completely drained both air systems? I'm more familiar with the CJ but
>I recall that the Yak system has to be completely drained before it will switch
>back over from the emergency system.
>>
>>
>>
________________________________
Date: Mon, 3 Sep 2012 20:17:26 -0500
>>Subject: Yak-List: Air Leak
>>From: rijaeger@wausau.k12.wi.us
>>To: yak-list@matronics.com
>>
>>
>>Greetings All! A while back my Yak 52 was test flown and at one point, the
>>emergency air was opened. Now the air system is reluctant to switch back over
to
>>the primary system and there's an audible hiss from the relief valve immediately
>>below the front seat / right side every time I open up the main air valve after
>>recharging. This valve has a large escape hole on top and if I seal it w/ my
>>thumb it seems to close the system and all is back to normal.
>>Unfortunately, everytime I open the master valve I go back to square one w/ this
>>process. I was told by one source that one of my actuator shuttle valves is
>>malfunctioning. But which one? I purchased an ultrasonic listening device in
an
>>attempt to trace down the source of the leaks. In "tapping" lines on all 3 gear,
>>the audible leak seems to resonate through all lines. It DOES seem to be
>>noticably-louder on the nose gear line - or is this simply because that point
is
>>physically-closer to the floor-mounted escape valve? What do I do next? Anyone
>>w/ experience in this area would be a welcome sight on my screen. Thank you for
>>your assistance and patience, guys!
>>
>> rget="_blank">http://www.matronics.com/Navigator?Yak-List
>>http://forums.matronics.com/ ="_blank">http://www.matronics.com/contribution
>>
>> et="_blank">http://www.matronics.com/Navigator?Yak-List
>>tp://forums.matronics.com _blank">http://www.matronics.com/contribution
>>
>
> et="_blank">http://www.matronics.com/Navigator?Yak-List
>ttp://forums.matronics.com _blank">http://www.matronics.com/contribution
>
Message 8
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George,=0ABut if he depletes all the air in both tanks, then pressurizes th
e tanks through =0Athe external air fill port, then turns the main air valv
e on and the emergency =0Arelief valve ("fart" valve) still leaks, I would
think it is more likely the =0Aemergency relief valve than a shuttle valve.
No? I guess one shuttle valve =0Acould be stuck, but with zero pressure
and then a full 50+ ATM's to push the =0Aball back the other way, my suspic
ion would be the relief valve just won't shut =0Aoff. I've had that happen
once or twice before.=0ADennis=0A=0A=0A=0A=0A_____________________________
___=0AFrom: George Coy <george.coy@gmail.com>=0ATo: yak-list@matronics.com
=0ASent: Tue, September 4, 2012 7:33:08 AM=0ASubject: RE: Yak-List: Air Lea
k=0A=0A=0ARico, The shuttle valves are the probably the problem. Disconnect
the nose =0Aemergency line and see if air comes out the line or the valve.
If the line then =0Arepeat with one of the landing gear. The shuttle val
ves are nothing more than =0Atwo lines into the top of a =9CT
=9D. the bottom of the =9CT=9D goes to the actuator. =0AThere i
s a little rubber ball that shuttles back and forth in the top of the =0A
=9CT=9D. They become hard and deformed over the years and when
you use the emergency =0Agear then the deformed ball does not seat the appr
opriate side of the =9CT=9D and =0Athus the leak. We have some
of the rubber balls if necessary. Jill has the kits =0Ato reseal the whole
assembly. =0A=0AGeorge=0A =0AFrom:owner-yak-list-server@matronics.com =0A[m
ailto:owner-yak-list-server@matronics.com] On Behalf Of Rico Jaeger=0ASent:
Tuesday, September 04, 2012 8:16 AM=0ATo: yak-list@matronics.com=0ASubject
: Re: Yak-List: Air Leak=0A =0AReplace the nose gear actuator?=0AOn Tue, Se
p 4, 2012 at 6:42 AM, A. Dennis Savarese <dsavarese0812@bellsouth.net> =0Aw
rote:=0ARico,=0AMost likely the valve you speak of is corroded inside and w
on't reset or shut =0Aoff as it is suppose to do. You most likely will hav
e to replace it. I =0Apersonally have never tried disassembling one. But
I guess it is possible. =0AEither way, it will need to be removed.=0ADenni
s=0A =0A=0A________________________________=0A=0AFrom:Rico Jaeger <rijaeger
@wausau.k12.wi.us>=0ATo: yak-list@matronics.com=0ASent: Mon, September 3, 2
012 10:16:38 PM=0ASubject: Re: Yak-List: Air Leak=0A =0AYes - zero'd both t
he primary and emergency systems.=0A =0AThank you for your response!=0AOn M
on, Sep 3, 2012 at 9:50 PM, Jon Boede <jonboede@hotmail.com> wrote:=0AHave
you completely drained both air systems? I'm more familiar with the CJ but
=0AI recall that the Yak system has to be completely drained before it wil
l switch =0Aback over from the emergency system.=0A>=0A____________________
____________=0A=0A>Date: Mon, 3 Sep 2012 20:17:26 -0500=0A>Subject: Yak-Lis
t: Air Leak=0A>From: rijaeger@wausau.k12.wi.us=0A>To: yak-list@matronics.co
m =0A>=0A>=0A>Greetings All! A while back my Yak 52 was test flown and at o
ne point, the =0A>emergency air was opened. Now the air system is reluctant
to switch back over to =0A>the primary system and there's an audible hiss
from the relief valve immediately =0A>below the front seat / right side eve
ry time I open up the main air valve after =0A>recharging. This valve has a
large escape hole on top and if I seal it w/ my =0A>thumb it seems to clos
e the system and all is back to normal. =0A>Unfortunately, everytime I open
the master valve I go back to square one w/ this =0A>process. I was told b
y one source that one of my actuator shuttle valves is =0A>malfunctioning.
But which one? I purchased an ultrasonic listening device in an =0A>attempt
to trace down the source of the leaks. In "tapping" lines on all 3 gear,
=0A>the audible leak seems to resonate through all lines. It DOES seem to b
e =0A>noticably-louder on the nose gear line - or is this simply because th
at point is =0A>physically-closer to the floor-mounted escape valve? What d
o I do next? Anyone =0A>w/ experience in this area would be a welcome sight
on my screen. Thank you for =0A>your assistance and patience, guys! =0A>
=0A> =0A> =0A>rget="_blank">http://www.matronics.com/Navigator?Yak-List
=0A>http://forums.matronics.com/=0A>="_blank">http://www.matronics.com/co
ntribution=0A> =0A> =0A> =0A>et="_blank">http://www.matronics.com/Navi
gator?Yak-List=0A>tp://forums.matronics.com=0A>_blank">http://www.matronics
.com/contribution=0A> =0A =0A =0A =0A =0A =0A =0Aet="_blank">http:/
/www.matronics.com/Navigator?Yak-List=0Attp://forums.matronics.com=0A_blank
">http://www.matronics.com/contribution=0A =0A =0A =0A =0Ahttp://www.mat
ronics.com/Navigator?Yak-List=0Ahttp://forums.matronics.com=0Ahttp://www.ma
====================== =0A
Message 9
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If the ball does not seal the emergency side (ie it is deformed) then
air will go from one side to the other and leak from the emergency
relief valve.
George
From: owner-yak-list-server@matronics.com
[mailto:owner-yak-list-server@matronics.com] On Behalf Of A. Dennis
Savarese
Sent: Tuesday, September 04, 2012 8:40 AM
Subject: Re: Yak-List: Air Leak
George,
But if he depletes all the air in both tanks, then pressurizes the tanks
through the external air fill port, then turns the main air valve on and
the emergency relief valve ("fart" valve) still leaks, I would think it
is more likely the emergency relief valve than a shuttle valve. No? I
guess one shuttle valve could be stuck, but with zero pressure and then
a full 50+ ATM's to push the ball back the other way, my suspicion would
be the relief valve just won't shut off. I've had that happen once or
twice before.
Dennis
_____
From: George Coy <george.coy@gmail.com>
Sent: Tue, September 4, 2012 7:33:08 AM
Subject: RE: Yak-List: Air Leak
Rico, The shuttle valves are the probably the problem. Disconnect the
nose emergency line and see if air comes out the line or the valve. If
the line then repeat with one of the landing gear. The shuttle valves
are nothing more than two lines into the top of a =9CT=9D.
the bottom of the =9CT=9D goes to the actuator. There is a
little rubber ball that shuttles back and forth in the top of the
=9CT=9D. They become hard and deformed over the years and
when you use the emergency gear then the deformed ball does not seat the
appropriate side of the =9CT=9D and thus the leak. We have
some of the rubber balls if necessary. Jill has the kits to reseal the
whole assembly.
George
From: owner-yak-list-server@matronics.com
[mailto:owner-yak-list-server@matronics.com] On Behalf Of Rico Jaeger
Sent: Tuesday, September 04, 2012 8:16 AM
Subject: Re: Yak-List: Air Leak
Replace the nose gear actuator?
On Tue, Sep 4, 2012 at 6:42 AM, A. Dennis Savarese
<dsavarese0812@bellsouth.net> wrote:
Rico,
Most likely the valve you speak of is corroded inside and won't reset or
shut off as it is suppose to do. You most likely will have to replace
it. I personally have never tried disassembling one. But I guess it is
possible. Either way, it will need to be removed.
Dennis
_____
From: Rico Jaeger <rijaeger@wausau.k12.wi.us>
Sent: Mon, September 3, 2012 10:16:38 PM
Subject: Re: Yak-List: Air Leak
Yes - zero'd both the primary and emergency systems.
Thank you for your response!
On Mon, Sep 3, 2012 at 9:50 PM, Jon Boede <jonboede@hotmail.com> wrote:
Have you completely drained both air systems? I'm more familiar with
the CJ but I recall that the Yak system has to be completely drained
before it will switch back over from the emergency system.
_____
Subject: Yak-List: Air Leak
From: rijaeger@wausau.k12.wi.us
Greetings All! A while back my Yak 52 was test flown and at one point,
the emergency air was opened. Now the air system is reluctant to switch
back over to the primary system and there's an audible hiss from the
relief valve immediately below the front seat / right side every time I
open up the main air valve after recharging. This valve has a large
escape hole on top and if I seal it w/ my thumb it seems to close the
system and all is back to normal. Unfortunately, everytime I open the
master valve I go back to square one w/ this process. I was told by one
source that one of my actuator shuttle valves is malfunctioning. But
which one? I purchased an ultrasonic listening device in an attempt to
trace down the source of the leaks. In "tapping" lines on all 3 gear,
the audible leak seems to resonate through all lines. It DOES seem to be
noticably-louder on the nose gear line - or is this simply because that
point is physically-closer to the floor-mounted escape valve? What do I
do next? Anyone w/ experience in this area would be a welcome sight on
my screen. Thank you for your assistance and patience, guys!
rget="_blank">http://www.matronics.com/Navigator?Yak-List
http://forums.matronics.com/
="_blank">http://www.matronics.com/contribution
et="_blank">http://www.matronics.com/Navigator?Yak-List
tp://forums.matronics.com <http://forums.matronics.com/>
_blank">http://www.matronics.com/contribution
et="_blank">http://www.matronics.com/Navigator?Yak-List
ttp://forums.matronics.com
_blank">http://www.matronics.com/contribution
http://www.matronics.com/Navigator?Yak-List
http://forums.matronics.com
http://www.matronics.com/contribution
httprel="nofollow" target="_blank"
href="http://forums.matronics.com">htt===========
============
://www.matronics.com/contribution">http://www.matronics.com/contribution
Message 10
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I certainly appreciate these tips, guys! I will attempt to dig into this
this week and post my findings... THANX!
On Tue, Sep 4, 2012 at 7:35 AM, George Coy <george.coy@gmail.com> wrote:
> If the ball does not seal the emergency side (ie it is deformed) then
> air will go from one side to the other and leak from the emergency relief
> valve. ****
>
> George****
>
> ** **
>
> *From:* owner-yak-list-server@matronics.com [mailto:
> owner-yak-list-server@matronics.com] *On Behalf Of *A. Dennis Savarese
> *Sent:* Tuesday, September 04, 2012 8:40 AM
>
> *To:* yak-list@matronics.com
> *Subject:* Re: Yak-List: Air Leak****
>
> ** **
>
> George,
> But if he depletes all the air in both tanks, then pressurizes the tanks
> through the external air fill port, then turns the main air valve on and
> the emergency relief valve ("fart" valve) still leaks, I would think it i
s
> more likely the emergency relief valve than a shuttle valve. No? I gues
s
> one shuttle valve could be stuck, but with zero pressure and then a full
> 50+ ATM's to push the ball back the other way, my suspicion would be the
> relief valve just won't shut off. I've had that happen once or twice
> before.
> Dennis****
>
> ** **
> ------------------------------
>
> *From:* George Coy <george.coy@gmail.com>
> *To:* yak-list@matronics.com
> *Sent:* Tue, September 4, 2012 7:33:08 AM
> *Subject:* RE: Yak-List: Air Leak****
>
> Rico, The shuttle valves are the probably the problem. Disconnect the nos
e
> emergency line and see if air comes out the line or the valve. If the lin
e
> then repeat with one of the landing gear. The shuttle valves are nothin
g
> more than two lines into the top of a =93T=94. the bottom of the =93T=94
goes to
> the actuator. There is a little rubber ball that shuttles back and forth
in
> the top of the =93T=94. They become hard and deformed over the years and
when
> you use the emergency gear then the deformed ball does not seat the
> appropriate side of the =93T=94 and thus the leak. We have some of the ru
bber
> balls if necessary. Jill has the kits to reseal the whole assembly. ****
>
> George****
>
> ****
>
> *From:* owner-yak-list-server@matronics.com [
> mailto:owner-yak-list-server@matronics.com<owner-yak-list-server@matronic
s.com>]
> *On Behalf Of *Rico Jaeger
> *Sent:* Tuesday, September 04, 2012 8:16 AM
> *To:* yak-list@matronics.com
> *Subject:* Re: Yak-List: Air Leak****
>
> ****
>
> Replace the nose gear actuator?****
>
> On Tue, Sep 4, 2012 at 6:42 AM, A. Dennis Savarese <
> dsavarese0812@bellsouth.net> wrote:****
>
> Rico,
> Most likely the valve you speak of is corroded inside and won't reset or
> shut off as it is suppose to do. You most likely will have to replace it
.
> I personally have never tried disassembling one. But I guess it is
> possible. Either way, it will need to be removed.
> Dennis****
>
> ****
> ------------------------------
>
> *From:* Rico Jaeger <rijaeger@wausau.k12.wi.us>
> *To:* yak-list@matronics.com
> *Sent:* Mon, September 3, 2012 10:16:38 PM
> *Subject:* Re: Yak-List: Air Leak****
>
> ****
>
> Yes - zero'd both the primary and emergency systems.****
>
> ****
>
> Thank you for your response!****
>
> On Mon, Sep 3, 2012 at 9:50 PM, Jon Boede <jonboede@hotmail.com> wrote:**
*
> *
>
> Have you completely drained both air systems? I'm more familiar with
> the CJ but I recall that the Yak system has to be completely drained befo
re
> it will switch back over from the emergency system.****
> ------------------------------
>
> Date: Mon, 3 Sep 2012 20:17:26 -0500
> Subject: Yak-List: Air Leak
> From: rijaeger@wausau.k12.wi.us
> To: yak-list@matronics.com ****
>
>
> Greetings All! A while back my Yak 52 was test flown and at one point, th
e
> emergency air was opened. Now the air system is reluctant to switch back
> over to the primary system and there's an audible hiss from the relief
> valve immediately below the front seat / right side every time I open up
> the main air valve after recharging. This valve has a large escape hole o
n
> top and if I seal it w/ my thumb it seems to close the system and all is
> back to normal. Unfortunately, everytime I open the master valve I go bac
k
> to square one w/ this process. I was told by one source that one of my
> actuator shuttle valves is malfunctioning. But which one? I purchased an
> ultrasonic listening device in an attempt to trace down the source of
> the leaks. In "tapping" lines on all 3 gear, the audible leak seems to
> resonate through all lines. It DOES seem to be noticably-louder on the no
se
> gear line - or is this simply because that point is physically-closer to
> the floor-mounted escape valve? What do I do next? Anyone w/ experience i
n
> this area would be a welcome sight on my screen. Thank you for your
> assistance and patience, guys! ****
>
> * *****
>
> * *****
>
> *rget="_blank">http://www.matronics.com/Navigator?Yak-List*****
>
> *http://forums.matronics.com/*****
>
> *="_blank">http://www.matronics.com/contribution*****
>
> * *****
>
> * *****
>
> * *****
>
> *et="_blank">http://www.matronics.com/Navigator?Yak-List*****
>
> *tp://forums.matronics.com*****
>
> *_blank">http://www.matronics.com/contribution*****
>
> * *****
>
> ****
>
> * *****
>
> * *****
>
> * *****
>
> * *****
>
> * *****
>
> *et="_blank">http://www.matronics.com/Navigator?Yak-List*****
>
> *ttp://forums.matronics.com*****
>
> *_blank">http://www.matronics.com/contribution*****
>
> * *****
>
> ****
>
> * *****
>
> * *
>
> * *****
>
> *http://www.matronics.com/Navigator?Yak-List*****
>
> *http://forums.matronics.com*****
>
> *http://www.matronics.com/contribution*****
>
> * *****
>
> *httprel="nofollow" target="_blank" href="http://forums.matronics.c
om">htt======================
==*
>
> *://www.matronics.com/contribution">http://www.matronics.com/contribution
*****
>
> * *
>
> * *
>
> **
>
> **
>
> **
>
> **
>
> **
>
> *http://www.matronics.com/Navigator?Yak-List*
>
> **
>
> **
>
> *http://forums.matronics.com*
>
> **
>
> **
>
> **
>
> **
>
> *http://www.matronics.com/contribution*
>
> **
>
> * *
>
> *
>
===========
===========
===========
===========
> *
>
>
Message 11
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Yes, I do agree with that. All Rico has to do is figure out which of the 3
=0Ashuttle valves is not sealing off. If Rico had the actuators overhaule
d, which =0Ashould have included the shuttle valves, then I think he needs
to go back to the =0Arelief valve.=0A=0ARico, did you recently overhaul the
actuators or have the actuators overhauled =0Aand were the shuttle valves
overhauled at the same time?=0ADennis=0A=0A=0A=0A=0A_______________________
_________=0AFrom: George Coy <george.coy@gmail.com>=0ATo: yak-list@matronic
s.com=0ASent: Tue, September 4, 2012 7:59:10 AM=0ASubject: RE: Yak-List: Ai
r Leak=0A=0A=0AIf the ball does not seal the emergency side (ie it is defor
med) then air will =0Ago from one side to the other and leak from the emerg
ency relief valve. =0AGeorge=0A =0AFrom:owner-yak-list-server@matronics.co
m =0A[mailto:owner-yak-list-server@matronics.com] On Behalf Of A. Dennis Sa
varese=0ASent: Tuesday, September 04, 2012 8:40 AM=0ATo: yak-list@matronics
.com=0ASubject: Re: Yak-List: Air Leak=0A =0AGeorge,=0ABut if he depletes a
ll the air in both tanks, then pressurizes the tanks through =0Athe externa
l air fill port, then turns the main air valve on and the emergency =0Areli
ef valve ("fart" valve) still leaks, I would think it is more likely the
=0Aemergency relief valve than a shuttle valve. No? I guess one shuttle v
alve =0Acould be stuck, but with zero pressure and then a full 50+ ATM's to
push the =0Aball back the other way, my suspicion would be the relief valv
e just won't shut =0Aoff. I've had that happen once or twice before.=0ADen
nis=0A =0A=0A________________________________=0A=0AFrom:George Coy <george.
coy@gmail.com>=0ATo: yak-list@matronics.com=0ASent: Tue, September 4, 2012
7:33:08 AM=0ASubject: RE: Yak-List: Air Leak=0ARico, The shuttle valves are
the probably the problem. Disconnect the nose =0Aemergency line and see if
air comes out the line or the valve. If the line then =0Arepeat with one
of the landing gear. The shuttle valves are nothing more than =0Atwo lines
into the top of a =9CT=9D. the bottom of the =9CT
=9D goes to the actuator. =0AThere is a little rubber ball that shuttles ba
ck and forth in the top of the =0A=9CT=9D. They become hard and
deformed over the years and when you use the emergency =0Agear then the de
formed ball does not seat the appropriate side of the =9CT=9D a
nd =0Athus the leak. We have some of the rubber balls if necessary. Jill ha
s the kits =0Ato reseal the whole assembly. =0A=0AGeorge=0A =0AFrom:owner-y
ak-list-server@matronics.com =0A[mailto:owner-yak-list-server@matronics.com
] On Behalf Of Rico Jaeger=0ASent: Tuesday, September 04, 2012 8:16 AM=0ATo
: yak-list@matronics.com=0ASubject: Re: Yak-List: Air Leak=0A =0AReplace th
e nose gear actuator?=0AOn Tue, Sep 4, 2012 at 6:42 AM, A. Dennis Savarese
<dsavarese0812@bellsouth.net> =0Awrote:=0ARico,=0AMost likely the valve you
speak of is corroded inside and won't reset or shut =0Aoff as it is suppos
e to do. You most likely will have to replace it. I =0Apersonally have ne
ver tried disassembling one. But I guess it is possible. =0AEither way, i
t will need to be removed.=0ADennis=0A =0A=0A______________________________
__=0A=0AFrom:Rico Jaeger <rijaeger@wausau.k12.wi.us>=0ATo: yak-list@matroni
cs.com=0ASent: Mon, September 3, 2012 10:16:38 PM=0ASubject: Re: Yak-List:
Air Leak=0A =0AYes - zero'd both the primary and emergency systems.=0A =0AT
hank you for your response!=0AOn Mon, Sep 3, 2012 at 9:50 PM, Jon Boede <jo
nboede@hotmail.com> wrote:=0AHave you completely drained both air systems?
I'm more familiar with the CJ but =0AI recall that the Yak system has to b
e completely drained before it will switch =0Aback over from the emergency
system.=0A>=0A________________________________=0A=0A>Date: Mon, 3 Sep 2012
20:17:26 -0500=0A>Subject: Yak-List: Air Leak=0A>From: rijaeger@wausau.k12.
wi.us=0A>To: yak-list@matronics.com =0A>=0A>=0A>Greetings All! A while back
my Yak 52 was test flown and at one point, the =0A>emergency air was opene
d. Now the air system is reluctant to switch back over to =0A>the primary s
ystem and there's an audible hiss from the relief valve immediately =0A>bel
ow the front seat / right side every time I open up the main air valve afte
r =0A>recharging. This valve has a large escape hole on top and if I seal i
t w/ my =0A>thumb it seems to close the system and all is back to normal.
=0A>Unfortunately, everytime I open the master valve I go back to square on
e w/ this =0A>process. I was told by one source that one of my actuator shu
ttle valves is =0A>malfunctioning. But which one? I purchased an ultrasonic
listening device in an =0A>attempt to trace down the source of the leaks.
In "tapping" lines on all 3 gear, =0A>the audible leak seems to resonate th
rough all lines. It DOES seem to be =0A>noticably-louder on the nose gear l
ine - or is this simply because that point is =0A>physically-closer to the
floor-mounted escape valve? What do I do next? Anyone =0A>w/ experience in
this area would be a welcome sight on my screen. Thank you for =0A>your ass
istance and patience, guys! =0A>=0A> =0A> =0A>rget="_blank">http://www.
matronics.com/Navigator?Yak-List=0A>http://forums.matronics.com/=0A>="_bl
ank">http://www.matronics.com/contribution=0A> =0A> =0A> =0A>et="_blan
k">http://www.matronics.com/Navigator?Yak-List=0A>tp://forums.matronics.com
=0A>_blank">http://www.matronics.com/contribution=0A> =0A =0A =0A =0A
=0A =0A =0Aet="_blank">http://www.matronics.com/Navigator?Yak-List=0Att
p://forums.matronics.com=0A_blank">http://www.matronics.com/contribution=0A
=0A =0A =0A =0A =0Ahttp://www.matronics.com/Navigator?Yak-List=0Ahttp:
//forums.matronics.com=0Ahttp://www.matronics.com/contribution=0A =0Ahttpr
el="nofollow" target="_blank" =0Ahref="http://forums.matronics.com">h
tt========================
=0A://www.matronics.com/contribution">http://www.matronics.com/contribution
=0A =0A =0Ahttp://www.matronics.com/Navigator?Yak-List=0Ahttp://forums.ma
===== =0A
Message 12
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Dennis - No work done on the actuators or relief valve since I've owned it
almost a year now. But there have been speratic air issues all along -
namely the system not charging much during engine runs and an audible hiss
that appears and crescendos (occasionally) AFTER shut down and AFTER master
air valve is closed. But as I stated earlier, this is a major leak that was
triggered by the emergency system being activated.
On Tue, Sep 4, 2012 at 8:11 AM, A. Dennis Savarese <
dsavarese0812@bellsouth.net> wrote:
> Yes, I do agree with that. All Rico has to do is figure out which of
> the 3 shuttle valves is not sealing off. If Rico had the actuators
> overhauled, which should have included the shuttle valves, then I think h
e
> needs to go back to the relief valve.
>
> Rico, did you recently overhaul the actuators or have the actuators
> overhauled and were the shuttle valves overhauled at the same time?
> Dennis
>
> ------------------------------
> *From:* George Coy <george.coy@gmail.com>
> *To:* yak-list@matronics.com
> *Sent:* Tue, September 4, 2012 7:59:10 AM
>
> *Subject:* RE: Yak-List: Air Leak
>
> If the ball does not seal the emergency side (ie it is deformed) then
> air will go from one side to the other and leak from the emergency relief
> valve.
>
> George
>
>
> *From:* owner-yak-list-server@matronics.com [mailto:
> owner-yak-list-server@matronics.com] *On Behalf Of *A. Dennis Savarese
> *Sent:* Tuesday, September 04, 2012 8:40 AM
> *To:* yak-list@matronics.com
> *Subject:* Re: Yak-List: Air Leak
>
>
> George,
> But if he depletes all the air in both tanks, then pressurizes the tanks
> through the external air fill port, then turns the main air valve on and
> the emergency relief valve ("fart" valve) still leaks, I would think it i
s
> more likely the emergency relief valve than a shuttle valve. No? I gues
s
> one shuttle valve could be stuck, but with zero pressure and then a full
> 50+ ATM's to push the ball back the other way, my suspicion would be the
> relief valve just won't shut off. I've had that happen once or twice
> before.
> Dennis
>
>
> ------------------------------
>
> *From:* George Coy <george.coy@gmail.com>
> *To:* yak-list@matronics.com
> *Sent:* Tue, September 4, 2012 7:33:08 AM
> *Subject:* RE: Yak-List: Air Leak
>
> Rico, The shuttle valves are the probably the problem. Disconnect the nos
e
> emergency line and see if air comes out the line or the valve. If the lin
e
> then repeat with one of the landing gear. The shuttle valves are nothin
g
> more than two lines into the top of a =93T=94. the bottom of the =93T=94
goes to
> the actuator. There is a little rubber ball that shuttles back and forth
in
> the top of the =93T=94. They become hard and deformed over the years and
when
> you use the emergency gear then the deformed ball does not seat the
> appropriate side of the =93T=94 and thus the leak. We have some of the ru
bber
> balls if necessary. Jill has the kits to reseal the whole assembly.
>
> George
>
>
> *From:* owner-yak-list-server@matronics.com [
> mailto:owner-yak-list-server@matronics.com<owner-yak-list-server@matronic
s.com>]
> *On Behalf Of *Rico Jaeger
> *Sent:* Tuesday, September 04, 2012 8:16 AM
> *To:* yak-list@matronics.com
> *Subject:* Re: Yak-List: Air Leak
>
>
> Replace the nose gear actuator?
>
> On Tue, Sep 4, 2012 at 6:42 AM, A. Dennis Savarese <
> dsavarese0812@bellsouth.net> wrote:
>
> Rico,
> Most likely the valve you speak of is corroded inside and won't reset or
> shut off as it is suppose to do. You most likely will have to replace it
.
> I personally have never tried disassembling one. But I guess it is
> possible. Either way, it will need to be removed.
> Dennis
>
>
> ------------------------------
>
> *From:* Rico Jaeger <rijaeger@wausau.k12.wi.us>
> *To:* yak-list@matronics.com
> *Sent:* Mon, September 3, 2012 10:16:38 PM
> *Subject:* Re: Yak-List: Air Leak
>
>
> Yes - zero'd both the primary and emergency systems.
>
>
> Thank you for your response!
>
> On Mon, Sep 3, 2012 at 9:50 PM, Jon Boede <jonboede@hotmail.com> wrote:
>
> Have you completely drained both air systems? I'm more familiar with
> the CJ but I recall that the Yak system has to be completely drained befo
re
> it will switch back over from the emergency system.
> ------------------------------
>
> Date: Mon, 3 Sep 2012 20:17:26 -0500
> Subject: Yak-List: Air Leak
> From: rijaeger@wausau.k12.wi.us
> To: yak-list@matronics.com
>
>
> Greetings All! A while back my Yak 52 was test flown and at one point, th
e
> emergency air was opened. Now the air system is reluctant to switch back
> over to the primary system and there's an audible hiss from the relief
> valve immediately below the front seat / right side every time I open up
> the main air valve after recharging. This valve has a large escape hole o
n
> top and if I seal it w/ my thumb it seems to close the system and all is
> back to normal. Unfortunately, everytime I open the master valve I go bac
k
> to square one w/ this process. I was told by one source that one of my
> actuator shuttle valves is malfunctioning. But which one? I purchased an
> ultrasonic listening device in an attempt to trace down the source of
> the leaks. In "tapping" lines on all 3 gear, the audible leak seems to
> resonate through all lines. It DOES seem to be noticably-louder on the no
se
> gear line - or is this simply because that point is physically-closer to
> the floor-mounted escape valve? What do I do next? Anyone w/ experience i
n
> this area would be a welcome sight on my screen. Thank you for your
> assistance and patience, guys!
>
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Message 13
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If the main & emergency air system components are all working correctly then there
shouldn't be any significant air seeping out via the emergency protection
(relief) valve anyway.
So IMHO I'd eliminate all the other sources of air leaks before scutinising the
emergency protection (relief) valve.
Rob R
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=382376#382376
Message 14
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Rico,
Since your airplane was a 'project', I think it might be a very good
idea to remove the actuators and overhaul them. The shuttle valves are
physically at the top of each of the actuators. You will save yourself
a whole lot of grief down the road by overhauling them now. Look at it
this way, which is less expensive? Overhauling all the actuators on the
airplane or potentially have one of the gear legs NOT come down when
you're getting ready to land.
BTW, don't just do the landing gear actuators and shuttle valves. Do ALL
the actuators including the uplock actuators and the flap actuator with
its two shuttle valves.
Dennis
A. Dennis Savarese
334-285-6263
334-546-8182 (mobile)
www.yak-52.com
Skype - Yakguy1
On 9/4/2012 8:46 AM, Rob Rowe wrote:
>
> If the main & emergency air system components are all working correctly then
there shouldn't be any significant air seeping out via the emergency protection
(relief) valve anyway.
> So IMHO I'd eliminate all the other sources of air leaks before scutinising the
emergency protection (relief) valve.
> Rob R
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=382376#382376
>
>
Message 15
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On Tue, Sep 4, 2012 at 6:28 AM, Rico Jaeger <rijaeger@wausau.k12.wi.us>wrote:
> Dennis - No work done on the actuators or relief valve since I've owned it
> almost a year now. But there have been speratic air issues all along -
> namely the system not charging much during engine runs and an audible hiss
> that appears and crescendos (occasionally) AFTER shut down and AFTER master
> air valve is closed. But as I stated earlier, this is a major leak that was
> triggered by the emergency system being activated.
>
Some times a shotgun really is the right answer. If you have been having
sporadic problems with your air system, it is probably time to just
rebuild/replace all the check valves and shuttle valves. (And wash every
line clean then blow it dry too.) Then you are starting with a pneumatic
system in a known state that you can readily maintain. You would be amazed
at the myriad faults that some rust flakes from a check-valve spring can
cause as they work their way through the pneumatic system causing one
check-valve or shuttle-valve after another to fault and then clear as the
detritus moves on.
Bite the bullet. Do it right. Reap the reward.
--
Brian Lloyd, WB6RQN/J79BPL
3191 Western Dr.
Cameron Park, CA 95682
brian@lloyd.com
+1.767.617.1365 (Dominica)
+1.916.877.5067 (USA)
Message 16
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Good point...also echoed by others here w/ much more experience than
myself! :)
On Tue, Sep 4, 2012 at 12:17 PM, Brian Lloyd <brian@lloyd.com> wrote:
> On Tue, Sep 4, 2012 at 6:28 AM, Rico Jaeger <rijaeger@wausau.k12.wi.us>wrote:
>
>> Dennis - No work done on the actuators or relief valve since I've owned
>> it almost a year now. But there have been speratic air issues all along -
>> namely the system not charging much during engine runs and an audible hiss
>> that appears and crescendos (occasionally) AFTER shut down and AFTER master
>> air valve is closed. But as I stated earlier, this is a major leak that was
>> triggered by the emergency system being activated.
>>
>
> Some times a shotgun really is the right answer. If you have been having
> sporadic problems with your air system, it is probably time to just
> rebuild/replace all the check valves and shuttle valves. (And wash every
> line clean then blow it dry too.) Then you are starting with a pneumatic
> system in a known state that you can readily maintain. You would be amazed
> at the myriad faults that some rust flakes from a check-valve spring can
> cause as they work their way through the pneumatic system causing one
> check-valve or shuttle-valve after another to fault and then clear as the
> detritus moves on.
>
> Bite the bullet. Do it right. Reap the reward.
>
> --
> Brian Lloyd, WB6RQN/J79BPL
> 3191 Western Dr.
> Cameron Park, CA 95682
> brian@lloyd.com
> +1.767.617.1365 (Dominica)
> +1.916.877.5067 (USA)
>
>
> *
>
> *
>
>
Message 17
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In many cases the check valve for the emergency fill is allowing some air t
o escape as it is not closing- completely. =0AHowever I have not been abl
e to find any source for the Romanian YAK version of the check valve- new
. Only rebuild kits.- If someone knows where to buy the original valve ne
w I am most interested as I have a small leak also
Message 18
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If either the check valve for the emergency fill or main fill are
leaking, you can spray soapy water on the external air fill port and see
if it bubbles. If it does, look at the air pressure instrument and the
side that is depleting is the check valve that is leaking. If the leak
is very slow, sometimes you may have to wait overnight to determine
which side is leaking by looking at the instrument. Then you will know
what check valve to attack.
Dennis
A. Dennis Savarese
334-285-6263
334-546-8182 (mobile)
www.yak-52.com
Skype - Yakguy1
On 9/4/2012 12:58 PM, delfin wrote:
> In many cases the check valve for the emergency fill is allowing some
> air to escape as it is not closing completely.
> However I have not been able to find any source for the Romanian YAK
> version of the check valve new. Only rebuild kits. If someone knows
> where to buy the original valve new I am most interested as I have a
> small leak also
>
> *
>
>
> *
Message 19
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Where is the emergency check valve located?
On Tue, Sep 4, 2012 at 1:31 PM, A. Dennis Savarese <
dsavarese0812@bellsouth.net> wrote:
> dsavarese0812@bellsouth.net>
>
> If either the check valve for the emergency fill or main fill are leaking,
> you can spray soapy water on the external air fill port and see if it
> bubbles. If it does, look at the air pressure instrument and the side that
> is depleting is the check valve that is leaking. If the leak is very slow,
> sometimes you may have to wait overnight to determine which side is leaking
> by looking at the instrument. Then you will know what check valve to
> attack.
> Dennis
>
> A. Dennis Savarese
> 334-285-6263
> 334-546-8182 (mobile)
> www.yak-52.com
> Skype - Yakguy1
>
>
> On 9/4/2012 12:58 PM, delfin wrote:
>
>> In many cases the check valve for the emergency fill is allowing some air
>> to escape as it is not closing completely.
>> However I have not been able to find any source for the Romanian YAK
>> version of the check valve new. Only rebuild kits. If someone knows where
>> to buy the original valve new I am most interested as I have a small leak
>> also
>>
>> *
>>
>>
>> *
>>
>
>
Message 20
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On the inside of the fuselage right behind the external air fill port.
A. Dennis Savarese
334-285-6263
334-546-8182 (mobile)
www.yak-52.com
Skype - Yakguy1
On 9/4/2012 1:47 PM, Rico Jaeger wrote:
> Where is the emergency check valve located?
>
> On Tue, Sep 4, 2012 at 1:31 PM, A. Dennis Savarese
> <dsavarese0812@bellsouth.net <mailto:dsavarese0812@bellsouth.net>> wrote:
>
> <dsavarese0812@bellsouth.net <mailto:dsavarese0812@bellsouth.net>>
>
> If either the check valve for the emergency fill or main fill are
> leaking, you can spray soapy water on the external air fill port
> and see if it bubbles. If it does, look at the air pressure
> instrument and the side that is depleting is the check valve that
> is leaking. If the leak is very slow, sometimes you may have to
> wait overnight to determine which side is leaking by looking at
> the instrument. Then you will know what check valve to attack.
> Dennis
>
> A. Dennis Savarese
> 334-285-6263
> 334-546-8182 (mobile)
> www.yak-52.com <http://www.yak-52.com/>
> Skype - Yakguy1
>
>
> On 9/4/2012 12:58 PM, delfin wrote:
>
> In many cases the check valve for the emergency fill is
> allowing some air to escape as it is not closing completely.
> However I have not been able to find any source for the
> Romanian YAK version of the check valve new. Only rebuild
> kits. If someone knows where to buy the original valve new I
> am most interested as I have a small leak also
>
> *
>
>
> *
>
> ============================================ties such as List
> Un/Subscription,
> www.matronics.com/Navigator?Yak-List"
> target="_blank">http://www.matronics.com/Navigator?Yak-List
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Message 21
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Got it - thanks!!
On Tue, Sep 4, 2012 at 3:11 PM, A. Dennis Savarese <
dsavarese0812@bellsouth.net> wrote:
> dsavarese0812@bellsouth.net>
>
> On the inside of the fuselage right behind the external air fill port.
>
>
> A. Dennis Savarese
> 334-285-6263
> 334-546-8182 (mobile)
> www.yak-52.com
> Skype - Yakguy1
>
> On 9/4/2012 1:47 PM, Rico Jaeger wrote:
>
>> Where is the emergency check valve located?
>>
>> On Tue, Sep 4, 2012 at 1:31 PM, A. Dennis Savarese <
>> dsavarese0812@bellsouth.net <mailto:dsavarese0812@**bellsouth.net<dsavarese0812@bellsouth.net>>>
>> wrote:
>>
>> <dsavarese0812@bellsouth.net <mailto:dsavarese0812@**bellsouth.net<dsavarese0812@bellsouth.net>>>
>>
>>
>>
>> If either the check valve for the emergency fill or main fill are
>> leaking, you can spray soapy water on the external air fill port
>> and see if it bubbles. If it does, look at the air pressure
>> instrument and the side that is depleting is the check valve that
>> is leaking. If the leak is very slow, sometimes you may have to
>> wait overnight to determine which side is leaking by looking at
>> the instrument. Then you will know what check valve to attack.
>> Dennis
>>
>> A. Dennis Savarese
>> 334-285-6263
>> 334-546-8182 (mobile)
>> www.yak-52.com <http://www.yak-52.com/>
>>
>> Skype - Yakguy1
>>
>>
>> On 9/4/2012 12:58 PM, delfin wrote:
>>
>> In many cases the check valve for the emergency fill is
>> allowing some air to escape as it is not closing completely.
>> However I have not been able to find any source for the
>> Romanian YAK version of the check valve new. Only rebuild
>> kits. If someone knows where to buy the original valve new I
>> am most interested as I have a small leak also
>>
>> *
>>
>>
>> *
>>
>> ==============================**==============ties such as List
>> Un/Subscription,
>> www.matronics.com/Navigator?**Yak-List<http://www.matronics.com/Navigator?Yak-List>
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