Today's Message Index:
----------------------
1. 02:18 AM - Re: Air leak - Don't have much more hair to pull out. (Aubrey Price)
2. 03:13 AM - Re: Air leak - Don't have much more hair to pull out. (A. Dennis Savarese)
3. 09:52 AM - Yak-52 and its implications (Richard Goode)
4. 11:57 AM - fuel vapor (Mark Jefferies YAK UK Ltd)
5. 12:02 PM - air leak (Mark Jefferies YAK UK Ltd)
6. 11:05 PM - home for a while. (cjpilot710@aol.com)
Message 1
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| Subject: | Air leak - Don't have much more hair to pull out. |
--> Yak-List message posted by: Aubrey Price <aprice@vartec.net>
I did check the gauges in both cockpits. I assume that if the valve beside
the pop off were leaking I would see it at the pop off, so I don't think
that is a problem. I didn't find the valves under the rear cockpit, but I
suspected there was at least one that I missed. I am in Europe. When I
return I will check those. How do I get to them?
-----Original Message-----
From: A. Dennis Savarese [mailto:adsavar@gte.net]
Subject: Re: Yak-List: Air leak - Don't have much more hair to pull out.
--> Yak-List message posted by: "A. Dennis Savarese" <adsavar@gte.net>
The check valve near the air fill port on the 52 is for the emergency
system. The two check valve on the firewall at the right and left side of
the pop off valve are for the main air system. The one on the left is from
the air fill port. The one on the right is from the "snot" bottle. There
are also two check valves under the rear cockpit floor on the right side
that go to the brake reducing valve. One from the main system and the other
from the emergency system.
Did you check the connections at the gauges in each cockpit? I have seen a
connection on a gauge leaking. There are two separate connections on each
gauge; one to the main system and one to the emergency system.
Dennis
----- Original Message -----
From: <cjpilot710@aol.com>
Subject: Re: Yak-List: Air leak - Don't have much more hair to pull out.
> --> Yak-List message posted by: cjpilot710@aol.com
>
>
> In a message dated 10/6/2003 1:34:49 PM Eastern Daylight Time,
> aprice@vartec.net writes:
>
> > >
> >
> > Last week my YAK52 started leaking down at night ( main system only ). I
> > have checked the pop off and put soap on every connection I can find. I
have
> > disconnected the down stream side of the main air valve and checked to
see
> > if it was leaking. I have checked at the fill port and it isn't leaking.
I
> > have removed the airtank, inspected and soap tested it and the
fittings.I
> > have had several people that have great hearing check and have found
> > nothing. The leak is getting worse every day. It will leak from 50ATM to
0
> > in less than 24 hours. I think there is a check valve somewhere that I
am
> > missing.I tested the check valve near the filler and it's not leaking.
This
> > almost has to be a leak inside the system or I could hear the leak. The
> > drawings I have of the system are bad quality and hard to read.Yesterday
I
> > pressurized the system with dry Freon and used an electronic devise to
sniff
> > for leaks. I found one small leak that wouldn't change the system
pressure
> > 1ATM in a week. Since the Freon detector never found anything inside the
> > aircraft, I have to assume the leak is between systems. I cycled the
flaps
> > and the detector went wild, so I know it was working.I am open for all
> > suggustions.
> >
> >
>
> Did you check the main air valve it self? I had this problem. It turned
out
> that the valve seat is aluminum while the valve itself is common steel.
What
> I found was a nice ball of rust (valve) and a very very thin grove on the
> valve seat. It continued to leak even after replacing the valve with a
stainless
> steel valve from Bill Blackwell. It was not until I refaced the valve
seat
> it self, did I get a good seal which lasts me a good month at times
between
> starts - when I remember to close it of course :}
>
> Jim Goolsby
>
> "They that can give up essential liberty to obtain a little safety,
> deserve neither liberty nor safety"
> Benjamin Franklin 1759
> "With my shield, or on it"
> Trojan Warriors BC
> "The reason older men are like fine wine. When young, they are like
grapes
> until some woman stomps all over them."
> Unknown older man.
>
>
> <HTML><FONT FACEarial,helvetica><FONT SIZE2 FAMILY"SANSSERIF" FACE=
> "Arial" LANG"0">In a message dated 10/6/2003 1:34:49 PM Eastern Daylig=
> ht Time, aprice@vartec.net writes:<BR>
> <BR>
> <BLOCKQUOTE TYPECITE style"BORDER-LEFT: #0000ff 2px solid; MARGIN-LEFT=
> : 5px; MARGIN-RIGHT: 0px; PADDING-LEFT: 5px">><BR>
> <BR>
> Last week my YAK52 started leaking down at night ( main system only ).
I<BR>
> have checked the pop off and put soap on every connection I can find. I
have=
> <BR>
> disconnected the down stream side of the main air valve and checked to
see<B=
> R>
> if it was leaking. I have checked at the fill port and it isn't leaking.
I<B=
> R>
> have removed the airtank, inspected and soap tested it and the
fittings.I<BR=
> >
> have had several people that have great hearing check and have found<BR>
> nothing. The leak is getting worse every day. It will leak from 50ATM to
0<B=
> R>
> in less than 24 hours. I think there is a check valve somewhere that I
am<BR=
> >
> missing.I tested the check valve near the filler and it's not leaking.
This<=
> BR>
> almost has to be a leak inside the system or I could hear the leak.
The<BR>
> drawings I have of the system are bad quality and hard to read.Yesterday
I<B=
> R>
> pressurized the system with dry Freon and used an electronic devise to
sniff=
> <BR>
> for leaks. I found one small leak that wouldn't change the system
pressure<B=
> R>
> 1ATM in a week. Since the Freon detector never found anything inside
the<BR>
> aircraft, I have to assume the leak is between systems. I cycled the
flaps<B=
> R>
> and the detector went wild, so I know it was working.I am open for all<BR>
> suggustions. <BR>
> <BR>
> </BLOCKQUOTE><BR>
> <BR>
> Did you check the main air valve it self? I had this problem.
It=
> turned out that the valve seat is aluminum while the valve itself is
common=
> steel. What I found was a nice ball of rust (valve) and a very very
t=
> hin grove on the valve seat. It continued to leak even after
replacing=
> the valve with a stainless steel valve from Bill Blackwell. It was
no=
> t until I refaced the valve seat it self, did I get a good seal which
lasts=20=
> me a good month at times between starts - when I remember to close it of
cou=
> rse :}<BR>
> <BR>
> </FONT><FONT COLOR"#000000" style"BACKGROUND-COLOR: #ffffff" SIZE3=
> FACE"Jimsrs" LANG"0">Jim Goolsby</FONT><FONT COLOR"#000000" style=
> "BACKGROUND-COLOR: #ffffff" SIZE2 FAMILY"SANSSERIF" FACE"Arial"=20=
> LANG"0"><BR>
> <BR>
> "They that can give up essential liberty to obtain a little safety, <BR>
> deserve neither liberty nor safety"<BR>
>
&nbs
=
>
p; &n
=
>
bsp;
=
> <U>Benjamin
Fra=
> nklin 1759</U><BR>
> "With my shield, or on it"<BR>
>
&nbs
=
>
p; &n
=
>
bsp;
=
> <U>Trojan
Warri=
> ors BC</U><BR>
> "The reason older men are like fine wine. When young, they are like
gr=
> apes until some woman stomps all over them."<BR>
>
&nbs
=
>
p; &n
=
>
bsp;
=
> <U>Unknown
olde=
> r man.</U><BR>
> </FONT></HTML>
>
>
Message 2
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| Subject: | Re: Air leak - Don't have much more hair to pull out. |
--> Yak-List message posted by: "A. Dennis Savarese" <adsavar@gte.net>
Remove the floor panels where your right foot would rest in the rear
cockpit.
Dennis
----- Original Message -----
From: "Aubrey Price" <aprice@vartec.net>
Subject: RE: Yak-List: Air leak - Don't have much more hair to pull out.
> --> Yak-List message posted by: Aubrey Price <aprice@vartec.net>
>
> I did check the gauges in both cockpits. I assume that if the valve beside
> the pop off were leaking I would see it at the pop off, so I don't think
> that is a problem. I didn't find the valves under the rear cockpit, but I
> suspected there was at least one that I missed. I am in Europe. When I
> return I will check those. How do I get to them?
> -----Original Message-----
> From: A. Dennis Savarese [mailto:adsavar@gte.net]
> To: yak-list@matronics.com
> Subject: Re: Yak-List: Air leak - Don't have much more hair to pull out.
>
>
> --> Yak-List message posted by: "A. Dennis Savarese" <adsavar@gte.net>
>
> The check valve near the air fill port on the 52 is for the emergency
> system. The two check valve on the firewall at the right and left side of
> the pop off valve are for the main air system. The one on the left is
from
> the air fill port. The one on the right is from the "snot" bottle. There
> are also two check valves under the rear cockpit floor on the right side
> that go to the brake reducing valve. One from the main system and the
other
> from the emergency system.
>
> Did you check the connections at the gauges in each cockpit? I have seen
a
> connection on a gauge leaking. There are two separate connections on each
> gauge; one to the main system and one to the emergency system.
> Dennis
>
> ----- Original Message -----
> From: <cjpilot710@aol.com>
> To: <yak-list@matronics.com>
> Subject: Re: Yak-List: Air leak - Don't have much more hair to pull out.
>
>
> > --> Yak-List message posted by: cjpilot710@aol.com
> >
> >
> > In a message dated 10/6/2003 1:34:49 PM Eastern Daylight Time,
> > aprice@vartec.net writes:
> >
> > > >
> > >
> > > Last week my YAK52 started leaking down at night ( main system only ).
I
> > > have checked the pop off and put soap on every connection I can find.
I
> have
> > > disconnected the down stream side of the main air valve and checked to
> see
> > > if it was leaking. I have checked at the fill port and it isn't
leaking.
> I
> > > have removed the airtank, inspected and soap tested it and the
> fittings.I
> > > have had several people that have great hearing check and have found
> > > nothing. The leak is getting worse every day. It will leak from 50ATM
to
> 0
> > > in less than 24 hours. I think there is a check valve somewhere that I
> am
> > > missing.I tested the check valve near the filler and it's not leaking.
> This
> > > almost has to be a leak inside the system or I could hear the leak.
The
> > > drawings I have of the system are bad quality and hard to
read.Yesterday
> I
> > > pressurized the system with dry Freon and used an electronic devise to
> sniff
> > > for leaks. I found one small leak that wouldn't change the system
> pressure
> > > 1ATM in a week. Since the Freon detector never found anything inside
the
> > > aircraft, I have to assume the leak is between systems. I cycled the
> flaps
> > > and the detector went wild, so I know it was working.I am open for all
> > > suggustions.
> > >
> > >
> >
> > Did you check the main air valve it self? I had this problem. It
turned
> out
> > that the valve seat is aluminum while the valve itself is common steel.
> What
> > I found was a nice ball of rust (valve) and a very very thin grove on
the
> > valve seat. It continued to leak even after replacing the valve with a
> stainless
> > steel valve from Bill Blackwell. It was not until I refaced the valve
> seat
> > it self, did I get a good seal which lasts me a good month at times
> between
> > starts - when I remember to close it of course :}
> >
> > Jim Goolsby
> >
> > "They that can give up essential liberty to obtain a little safety,
> > deserve neither liberty nor safety"
> > Benjamin Franklin 1759
> > "With my shield, or on it"
> > Trojan Warriors BC
> > "The reason older men are like fine wine. When young, they are like
> grapes
> > until some woman stomps all over them."
> > Unknown older man.
> >
> >
> > <HTML><FONT FACEarial,helvetica><FONT SIZE2 FAMILY"SANSSERIF" FACE=
> > "Arial" LANG"0">In a message dated 10/6/2003 1:34:49 PM Eastern Daylig=
> > ht Time, aprice@vartec.net writes:<BR>
> > <BR>
> > <BLOCKQUOTE TYPECITE style"BORDER-LEFT: #0000ff 2px solid; MARGIN-LEFT=
> > : 5px; MARGIN-RIGHT: 0px; PADDING-LEFT: 5px">><BR>
> > <BR>
> > Last week my YAK52 started leaking down at night ( main system only ).
> I<BR>
> > have checked the pop off and put soap on every connection I can find. I
> have=
> > <BR>
> > disconnected the down stream side of the main air valve and checked to
> see<B=
> > R>
> > if it was leaking. I have checked at the fill port and it isn't leaking.
> I<B=
> > R>
> > have removed the airtank, inspected and soap tested it and the
> fittings.I<BR=
> > >
> > have had several people that have great hearing check and have found<BR>
> > nothing. The leak is getting worse every day. It will leak from 50ATM to
> 0<B=
> > R>
> > in less than 24 hours. I think there is a check valve somewhere that I
> am<BR=
> > >
> > missing.I tested the check valve near the filler and it's not leaking.
> This<=
> > BR>
> > almost has to be a leak inside the system or I could hear the leak.
> The<BR>
> > drawings I have of the system are bad quality and hard to read.Yesterday
> I<B=
> > R>
> > pressurized the system with dry Freon and used an electronic devise to
> sniff=
> > <BR>
> > for leaks. I found one small leak that wouldn't change the system
> pressure<B=
> > R>
> > 1ATM in a week. Since the Freon detector never found anything inside
> the<BR>
> > aircraft, I have to assume the leak is between systems. I cycled the
> flaps<B=
> > R>
> > and the detector went wild, so I know it was working.I am open for
all<BR>
> > suggustions. <BR>
> > <BR>
> > </BLOCKQUOTE><BR>
> > <BR>
> > Did you check the main air valve it self? I had this
problem.
> It=
> > turned out that the valve seat is aluminum while the valve itself is
> common=
> > steel. What I found was a nice ball of rust (valve) and a very
very
> t=
> > hin grove on the valve seat. It continued to leak even after
> replacing=
> > the valve with a stainless steel valve from Bill Blackwell. It
was
> no=
> > t until I refaced the valve seat it self, did I get a good seal which
> lasts=20=
> > me a good month at times between starts - when I remember to close it of
> cou=
> > rse :}<BR>
> > <BR>
> > </FONT><FONT COLOR"#000000" style"BACKGROUND-COLOR: #ffffff" SIZE3=
> > FACE"Jimsrs" LANG"0">Jim Goolsby</FONT><FONT COLOR"#000000" style=
> > "BACKGROUND-COLOR: #ffffff" SIZE2 FAMILY"SANSSERIF" FACE"Arial"=20=
> > LANG"0"><BR>
> > <BR>
> > "They that can give up essential liberty to obtain a little safety, <BR>
> > deserve neither liberty nor safety"<BR>
> >
>
&nbs
>
> >
>
p; &n
>
> >
>
bsp;
>
> > <U>Benjamin
> Fra=
> > nklin 1759</U><BR>
> > "With my shield, or on it"<BR>
> >
>
&nbs
>
> >
>
p; &n
>
> >
>
bsp;
>
> > <U>Trojan
> Warri=
> > ors BC</U><BR>
> > "The reason older men are like fine wine. When young, they are
like
> gr=
> > apes until some woman stomps all over them."<BR>
> >
>
&nbs
>
> >
>
p; &n
>
> >
>
bsp;
>
> > <U>Unknown
> olde=
> > r man.</U><BR>
> > </FONT></HTML>
> >
> >
>
>
Message 3
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| Subject: | Yak-52 and its implications |
--> Yak-List message posted by: "Richard Goode" <Richard.Goode@russianaeros.com>
Dear Yak Club
Yak-52M and its implications
The Russian airforce has long needed a new training aircraft. They have for=
many years used the L-39, even for basic airforce training, but obviously
with high associated costs. The Yak-52s have been operated principally by R=
OSTO, the successor to DOSAAF, in more of a sport-flying role, and of cours=
e many 52s have been exported to the West.
An internal competition was established between Sukhoi and Yakovlev, result=
ing in the Su-49, an all composite, tricycle version of the Su-29 and the Y=
ak-54M, similarly a modified Yak-54. Both aircraft were to be powered by a
450hp engine, and incorporate the Zvesda Pilot Extraction Systems.
The airforce was not keen on a composite aircraft, both because of signific=
antly greater cost, but also because of the problems of repairing localised=
damage, but Sukhoi has considerably more governmental influence than Yakov=
lev, and apparently won the competition. However there remained critical sh=
ortage in Russian military funding, and while a mock up Su-49 has been buil=
t, OKB Sukhoi are not prepared to make a flying prototype without governmen=
t funding, and thus far none has been forth coming. In consequence the airf=
orce has looked again at the Yak-52, and a new version, the 52M, was shown
at this years Moscow airshow. The basic airframe would appear to be unchang=
ed, but the principal differences seem to be:
a.. 420/450hp engine and 3-blade propeller.
b.. Large sideways-hinging canopy.
c.. Zvesda Extraction seats.
d.. A "glass" cockpit.
e.. "Strengthened" wing - apparently increasing "life" from a thousand ho=
urs to three thousand hours!
f.. Long range fuel.
The potential requirement is for up to four hundred aircraft made from 'old=
52s', and, should this happen; it would surely remove the vast majority of=
good condition 52s from the potential market for Western owners. Like most=
things in Russia these decisions are unlikely to be made quickly, but once=
it does things could change rapidly! (In passing the Ukrainians are planin=
g to make a turbine version of the 52 for their airforce training requireme=
nts).
Richard Goode
Richard Goode Aerobatics
Newport House
Almeley
Hereford
HR3 6LL
Tel: +44 (0) 1544 322200
Fax:+44 (0) 1544 322208
www.russianaeros.com
--
This message has been scanned for viruses and
dangerous content by the http://www.anti84787.com
MailScanner, and is believed to be clean.
--
<HTML><HEAD>
<META content"MSHTML 5.00.2614.3500" nameGENERATOR>
<STYLE></STYLE>
</HEAD>
<BODY bgColor#ffffff>
<DIV style"FONT: 10pt arial"></DIV>
<DIV><FONT face"Bookman Old Style">
<P>Dear Yak Club</P><B><U>
<P>Yak-52M and its implications</P></B></U>
<P>The Russian airforce has long needed a new training aircraft. They have
for
many years used the L-39, even for basic airforce training, but obviously w=
ith
high associated costs. The Yak-52s have been operated principally by ROSTO,=
the
successor to DOSAAF, in more of a sport-flying role, and of course many 52s=
have
been exported to the West.</P>
<P>An internal competition was established between Sukhoi and Yakovlev,
resulting in the Su-49, an all composite, tricycle version of the Su-29 and=
the
Yak-54M, similarly a modified Yak-54. Both aircraft were to be powered by a=
450hp engine, and incorporate the Zvesda Pilot Extraction Systems. </P>
<P>The airforce was not keen on a composite aircraft, both because of
significantly greater cost, but also because of the problems of repairing=
localised damage, but Sukhoi has considerably more governmental influence t=
han
Yakovlev, and apparently won the competition. However there remained critic=
al
shortage in Russian military funding, and while a mock up Su-49 has been bu=
ilt,
OKB Sukhoi are not prepared to make a flying prototype without government=
funding, and thus far none has been forth coming. In consequence the airfor=
ce
has looked again at the Yak-52, and a new version, the 52M, was shown at th=
is
years Moscow airshow. The basic airframe would appear to be unchanged, but
the
principal differences seem to be:</P>
<UL>
<LI>420/450hp engine and 3-blade propeller.
<LI>Large sideways-hinging canopy.
<LI>Zvesda Extraction seats.
<LI>A "glass" cockpit.
<LI>"Strengthened" wing - apparently increasing "life" from a thousand ho=
urs
to three thousand hours!
<LI>Long range fuel.</LI></UL>
<P>The potential requirement is for up to four hundred aircraft made from '=
old
52s', and, should this happen; it would surely remove the vast majority of
good
condition 52s from the potential market for Western owners. Like most thing=
s in
Russia these decisions are unlikely to be made quickly, but once it does th=
ings
could change rapidly! (In passing the Ukrainians are planing to make a turb=
ine
version of the 52 for their airforce training requirements).</P>
<P>Richard Goode</P></FONT></DIV>
<DIV><FONT face"Bookman Old Style">Richard Goode Aerobatics<BR>Newport=
House<BR>Almeley<BR>Hereford<BR>HR3 6LL<BR> <BR>Tel: +44 (0) 1544
322200<BR>Fax:+44 (0) 1544 322208<BR><A
href"http://www.russianaeros.com">www.russianaeros.com</A></FONT></DIV><=
-------------
<br/>This message has been scanned for viruses and
<br/>dangerous content by the http://www.anti84787.com
<br/>MailScanner, and is believed to be clean.
-------
</HTML>
Message 4
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type="multipart/alternative"
--> Yak-List message posted by: "Mark Jefferies YAK UK Ltd" <mark@yakuk.com>
Its most likely that the fuel is entering the vent pipe whilst inverted.
Then when you errect it flows out to the underside of the a/c, this
being a high pressure area then vents to the low pressure area ie the
cockpit entering via the fairings and other joints.
On the 50 make sure that the vent is actually outside the the cockpit
behind the seat area, if you have the early vent which exits behine the
exhaust area move it aft.
cheers, MJ
Time: 07:47:52 AM PST US
Subject: Yak-List: fuel vapour in cockpit while inverted/negative G
From: "BUTLER, FRANCIS" <FRANCIS_BUTLER@butler-machinery.com>
--> Yak-List message posted by: "BUTLER, FRANCIS"
<FRANCIS_BUTLER@butler-machinery.com>
I have had three Yaks, (1) 52 and (2)50's, that after sustained negative
G, I can
smell fuel vapour in the cockpit. Is this common on all 52 and 50's? I
am
doing more negative stuff with my 50 now and would like to find a
solution.
Francis Butler
Butler Machinery Co.
(701) 298-1758 direct
(701) 476-3208 fax
francis_butler@butler-machinery.com
<HTML><HEAD>
href"file://C:\Program Files\Common Files\Microsoft
Shared\Stationery\">
<STYLE>BODY {
BACKGROUND-POSITION: left top; MARGIN-TOP: 25px; FONT-SIZE: 10pt;
MARGIN-LEFT: 50px; COLOR: #808080; BACKGROUND-REPEAT: repeat-y;
FONT-STYLE: italic; FONT-FAMILY: Georgia
}
</STYLE>
<META content"MSHTML 6.00.2800.1264" nameGENERATOR></HEAD>
<BODY bgColor#808080
backgroundcid:028901c38d04$b5e56080$0b00000a@marklaptop>
<DIV>Its most likely that the fuel is entering the vent pipe whilst
inverted.
Then when you errect it flows out to the underside of the a/c, this
being a high
pressure area then vents to the low pressure area ie the cockpit
entering via
the fairings and other joints.</DIV>
<DIV> </DIV>
<DIV>On the 50 make sure that the vent is actually outside the the
cockpit
behind the seat area, if you have the early vent which exits behine the
exhaust
area move it aft. </DIV>
<DIV> </DIV>
<DIV>cheers, MJ</DIV>
<DIV> </DIV>
<DIV>Time: 07:47:52 AM PST US<BR>Subject: Yak-List: fuel vapour in
cockpit while
inverted/negative G<BR>From: "BUTLER, FRANCIS" <<A
href"mailto:FRANCIS_BUTLER@butler-machinery.com">FRANCIS_BUTLER@butler=
-machinery.com</A>><BR><BR>-->
Yak-List message posted by: "BUTLER, FRANCIS" <<A
href"mailto:FRANCIS_BUTLER@butler-machinery.com">FRANCIS_BUTLER@butler=
-machinery.com</A>><BR><BR><BR>I
have had three Yaks, (1) 52 and (2)50's, that after sustained negative
G, I
can<BR>smell fuel vapour in the cockpit. Is this common on all 52
and
50's? I am<BR>doing more negative stuff with my 50 now and would
like to
find a solution. <BR><BR>Francis Butler<BR>Butler Machinery
Co.<BR>(701)
298-1758 direct<BR>(701) 476-3208 fax<BR><A
href"mailto:francis_butler@butler-machinery.com">francis_butler@butler=
-machinery.com</A></DIV>
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Message 5
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type="multipart/alternative"
--> Yak-List message posted by: "Mark Jefferies YAK UK Ltd" <mark@yakuk.com>
Check the "o" ring on the air taps, this is a week point and covers
about 80% of over night leaks. The 52 does not suffer from porus pipe
like the 50. The pipe made in ashenyev is "crap", the Y55 also has porus
pipe. The 52 pipe will crack first!!!
-------
Best regards
Mark Jefferies
Managing director YAK UK Ltd
+ Little Gransden Airfield, Sandy, Beds SG19 3BP, England.
* mark@yakuk.com
: www.yakuk.com
( +44 (0)1767 651156 Office
( +44 (0)1767 651157 Fax
( +44 (0)7785 538 317 Mobile
Time: 10:33:50 AM PST US
From: Aubrey Price <aprice@vartec.net>
Subject: Yak-List: Air leak - Don't have much more hair to pull out.
--> Yak-List message posted by: Aubrey Price <aprice@vartec.net>
Last week my YAK52 started leaking down at night ( main system only ). I
have checked the pop off and put soap on every connection I can find. I
have
disconnected the down stream side of the main air valve and checked to
see
if it was leaking. I have checked at the fill port and it isn't leaking.
I
have removed the airtank, inspected and soap tested it and the
fittings.I
have had several people that have great hearing check and have found
nothing. The leak is getting worse every day. It will leak from 50ATM to
0
in less than 24 hours. I think there is a check valve somewhere that I
am
missing.I tested the check valve near the filler and it's not leaking.
This
almost has to be a leak inside the system or I could hear the leak. The
drawings I have of the system are bad quality and hard to read.Yesterday
I
pressurized the system with dry Freon and used an electronic devise to
sniff
for leaks. I found one small leak that wouldn't change the system
pressure
1ATM in a week. Since the Freon detector never found anything inside the
aircraft, I have to assume the leak is between systems. I cycled the
flaps
and the detector went wild, so I know it was working.I am open for all
suggustions.
Aubrey Price
N288Y
-------
Best regards
Mark Jefferies
Managing director YAK UK Ltd
+ Little Gransden Airfield, Sandy, Beds SG19 3BP, England.
* mark@yakuk.com
: www.yakuk.com
( +44 (0)1767 651156 Office
( +44 (0)1767 651157 Fax
( +44 (0)7785 538 317 Mobile
<HTML><HEAD>
href"file://C:\Program Files\Common Files\Microsoft
Shared\Stationery\">
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backgroundcid:029301c38d05$504d9340$0b00000a@marklaptop>
<DIV>Check the "o" ring on the air taps, this is a week point and covers
about
80% of over night leaks. The 52 does not suffer from porus pipe like the
50. The
pipe made in ashenyev is "crap", the Y55 also has porus pipe. The 52
pipe will
crack first!!!</DIV>
<DIV> </DIV>
<DIV>
<DIV idMarquee2 style"FONT-SIZE: 10pt; WIDTH: 415px; HEIGHT:
150px" <MARQUEE
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<MARQUEE idMarquee1 style"WIDTH: 306px; HEIGHT: 58px" trueSpeed
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border"0">
<DIV><FONT faceTahoma color#000080 size4>Best
regards</FONT></DIV>
<DIV><FONT faceTahoma color#000080 size5>Mark
Jefferies</FONT></DIV></MARQUEE>
<DIV><STRONG><FONT color#000080>Managing director YAK UK
Ltd</FONT></STRONG></DIV>
<DIV>
<MARQUEE idMarquee2 style"WIDTH: 424px; HEIGHT: 19px" trueSpeed
scrollAmount1
scrollDelay6 behaviorslide loop1 border"0"><FONT
faceWingdings><FONT
color#000099 size2>+ </FONT><STRONG><FONT faceTahoma
color#000080>Little
Gransden Airfield, Sandy, Beds SG19 3BP,
England.</FONT></STRONG></FONT></MARQUEE></DIV>
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New"></FONT>
</FONT><FONT faceTahoma color#333333><STRONG><A
href"mailto:mark@yakuk.com">mark@yakuk.com</A></STRONG></FONT></MARQUE=
E></DIV>
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href"http://www.yakuk.com/">www.yakuk.com</A></STRONG></FONT></MARQUEE=
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<BLOCKQUOTE></BLOCKQUOTE>
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<DIV> </DIV>
<DIV>Time: 10:33:50 AM PST US<BR>From: Aubrey Price <<A
href"mailto:aprice@vartec.net">aprice@vartec.net</A>><BR>Subject:
Yak-List:
Air leak - Don't have much more hair to pull out.<BR><BR>--> Yak-List
message
posted by: Aubrey Price <<A
href"mailto:aprice@vartec.net">aprice@vartec.net</A>><BR><BR>Last
week my
YAK52 started leaking down at night ( main system only ). I<BR>have
checked the
pop off and put soap on every connection I can find. I
have<BR>disconnected the
down stream side of the main air valve and checked to see<BR>if it was
leaking.
I have checked at the fill port and it isn't leaking. I<BR>have removed
the
airtank, inspected and soap tested it and the fittings.I<BR>have had
several
people that have great hearing check and have found<BR>nothing. The leak
is
getting worse every day. It will leak from 50ATM to 0<BR>in less than 24
hours.
I think there is a check valve somewhere that I am<BR>missing.I tested
the check
valve near the filler and it's not leaking. This<BR>almost has to be a
leak
inside the system or I could hear the leak. The<BR>drawings I have of
the system
are bad quality and hard to read.Yesterday I<BR>pressurized the system
with dry
Freon and used an electronic devise to sniff<BR>for leaks. I found one
small
leak that wouldn't change the system pressure<BR>1ATM in a week. Since
the Freon
detector never found anything inside the<BR>aircraft, I have to assume
the leak
is between systems. I cycled the flaps<BR>and the detector went wild, so
I know
it was working.I am open for all<BR>suggustions. <BR><BR>Aubrey Price
<BR>N288Y</DIV>
<DIV>
<DIV idMarquee2 style"FONT-SIZE: 10pt; WIDTH: 415px; HEIGHT:
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behavior"slide" direction"down" loop"1" scrollAmount"1"
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<DIV><FONT faceTahoma color#000080 size4>Best
regards</FONT></DIV>
<DIV><FONT faceTahoma color#000080 size5>Mark
Jefferies</FONT></DIV></MARQUEE>
<DIV><STRONG><FONT color#000080>Managing director YAK UK
Ltd</FONT></STRONG></DIV>
<DIV>
<MARQUEE idMarquee2 style"WIDTH: 424px; HEIGHT: 19px" trueSpeed
scrollAmount1
scrollDelay6 behaviorslide loop1 border"0"><FONT
faceWingdings><FONT
color#000099 size2>+ </FONT><STRONG><FONT faceTahoma
color#000080>Little
Gransden Airfield, Sandy, Beds SG19 3BP,
England.</FONT></STRONG></FONT></MARQUEE></DIV>
<DIV>
<MARQUEE idMarquee2 style"FONT-SIZE: 10pt; WIDTH: 230px; HEIGHT:
15px"
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New"></FONT>
</FONT><FONT faceTahoma color#333333><STRONG><A
href"mailto:mark@yakuk.com">mark@yakuk.com</A></STRONG></FONT></MARQUE=
E></DIV>
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New"></FONT>
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href"http://www.yakuk.com/">www.yakuk.com</A></STRONG></FONT></MARQUEE=
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Message 6
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| Subject: | home for a while. |
--> Yak-List message posted by: cjpilot710@aol.com
Well gang,
Finaly caught up on all my e-mail.
Just got back from 2 weeks of flying the B-24 for the Collings Foundation.
It all started in Nasua, NH, where on arriving, I had to jump right in and help
change a bad cylinder on the B-17. This is an oily mess no matter how you do
it. About 5 days later we had to make a NDB approach into Oxford, CT. (the
ILS was OS). When was the last time you've done a fixed card ADF approach to
minimums? And did I tell you the B-24 leaks? During this trip, I was
interviewed by newspapers, TV, and even did a local live radio interview. Yes,
I've
had more than my 15 seconds of fame.
In Newburg, NY we change tires on the B-17. This happens about every 4 or 5
months. These tires cost $2,500 new, ($800 recap) and the tubes are $500 a
shot. BTW tires are made in lots of 100 only. I finished up my part of the
tour at Pittsburgh's Allegheny airport. What should show up on the ramp and
garner almost as much attention as our bombers? An unpainted CJ-6A owned by Ed
Lovejoy. He has owned it a couple of years, I think he said. I wasn't able to
talk long because I was "working" but my fellow bomber pilots were hearing a
lot of "What is that airplane?" by the folks who were walking though ours. I
had to chase a number of them away because they were passing over our crowd
control ropes for a look-see.
As usual I met a lot of nice WW2 vets, perhaps the best part of this "job".
The school kids are always full of questions, particularly about the nude
painted on the side of the B-24. Up at Pittsfeild, MA. some 'lady' call to say
she was going to sue us, because she was offended by it. Yes folks, they're
still out there, dumb as ever!
Hey! Just heard. Gen. Yeager just ground hoop a AT-6. Banged it up some
too. Hmmmmm "Those who have and those who - - - -"
Anyway will go back out on the 28th and finish the season on Nov 9, at the
Columbia, SC airshow. Will than fly the plane down to Florida for its winter
maintenance. ITMT is anyone wanting to do some CJ/Yak formation near here? :-)
Jim Goolsby
"They that can give up essential liberty to obtain a little safety,
deserve neither liberty nor safety"
Benjamin Franklin 1759
"With my shield, or on it"
Trojan Warriors BC
"The reason older men are like fine wine. When young, they are like grapes
until some woman stomps all over them."
Unknown older man.
<HTML><FONT FACEarial,helvetica><FONT SIZE2 FAMILY"SANSSERIF" FACE=
"Arial" LANG"0">Well gang,<BR>
Finaly caught up on all my e-mail.<BR>
Just got back from 2 weeks of flying the B-24 for the Collings Foundation.&n=
bsp; It all started in Nasua, NH, where on arriving, I had to jump right in=20=
and help change a bad cylinder on the B-17. This is an oily mess no ma=
tter how you do it. About 5 days later we had to make a NDB approach i=
nto Oxford, CT. (the ILS was OS). When was the last time you've done a=
fixed card ADF approach to minimums? And did I tell you the B-24 leak=
s? During this trip, I was interviewed by newspapers, TV, and even did=
a local live radio interview. Yes, I've had more than my 15 seconds o=
f fame. <BR>
<BR>
In Newburg, NY we change tires on the B-17. This happens about every 4=
or 5 months. These tires cost $2,500 new, ($800 recap) and the tubes=20=
are $500 a shot. BTW tires are made in lots of 100 only. I finis=
hed up my part of the tour at Pittsburgh's Allegheny airport. What sho=
uld show up on the ramp and garner almost as much attention as our bombers?&=
nbsp; An unpainted CJ-6A owned by Ed Lovejoy. He has owned it a couple=
of years, I think he said. I wasn't able to talk long because I was "=
working" but my fellow bomber pilots were hearing a lot of "What is that air=
plane?" by the folks who were walking though ours. I had to chase a nu=
mber of them away because they were passing over our crowd control ropes for=
a look-see.<BR>
<BR>
As usual I met a lot of nice WW2 vets, perhaps the best part of this "job".&=
nbsp; The school kids are always full of questions, particularly about the n=
ude painted on the side of the B-24. Up at Pittsfeild, MA. some 'lady'=
call to say she was going to sue us, because she was offended by it. =20=
Yes folks, they're still out there, dumb as ever!<BR>
<BR>
Hey! Just heard. Gen. Yeager just ground hoop a AT-6. Bang=
ed it up some too. Hmmmmm "Those who have and those who - - - -"=
<BR>
<BR>
Anyway will go back out on the 28th and finish the season on Nov 9, at the C=
olumbia, SC airshow. Will than fly the plane down to Florida for its w=
inter maintenance. ITMT is anyone wanting to do some CJ/Yak formation=20=
near here? :-)<BR>
<BR>
</FONT><FONT COLOR"#000000" style"BACKGROUND-COLOR: #ffffff" SIZE3=
FACE"Jimsrs" LANG"0">Jim Goolsby<BR>
</FONT><FONT COLOR"#000000" style"BACKGROUND-COLOR: #ffffff" SIZE2=
FAMILY"SANSSERIF" FACE"Arial" LANG"0"><BR>
<BR>
"They that can give up essential liberty to obtain a little safety, <BR>
deserve neither liberty nor safety"<BR>
&nbs=
p; &n=
bsp; =
<U>Benjamin Fra=
nklin 1759</U><BR>
"With my shield, or on it"<BR>
&nbs=
p; &n=
bsp; =
<U>Trojan Warri=
ors BC</U><BR>
"The reason older men are like fine wine. When young, they are like gr=
apes until some woman stomps all over them."<BR>
&nbs=
p; &n=
bsp; =
<U>Unknown olde=
r man.</U><BR>
</FONT></HTML>
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