Today's Message Index:
----------------------
1. 06:02 AM - Losing Air After Start (Rich Langer)
2. 06:17 AM - Re: Losing Air After Start (A. Dennis Savarese)
3. 08:21 AM - Re: Losing air after start, been there! (Justin Drafts)
4. 11:12 AM - Re: Re: Losing air after start, been there! (Hank Gibson)
5. 08:02 PM - Re: [Non-DoD Source] Re: Gyro compass adjustment (Bitterlich, Mark G CIV NAVAIR, WD)
6. 08:53 PM - CJ6 Cone Bolt (or Taper Pin)... (stephen.hayne)
7. 10:02 PM - Re: [Non-DoD Source] Re: Gyro compass adjustment (Walter Lannon)
8. 10:29 PM - [Non-DoD Source] Re: Gyro compass adjustment (Looigi)
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| Subject: | Losing Air After Start |
Here is my problem. I open the main air valve and the air pressure holds steady
at 36. After pressing the start button, the engine starts normally and for roughly
the next few minutes the pressure holds steady at 28. Then the pressure
starts to drop and goes to 0 in about 10 minutes. Emergency air is at 42 and
holds steady at 42. I was at Sun-n-fun and there was too much noise to hear any
leaks.
Here is what we have checked so far. We checked the fill port for leaks, after
we added air from an air tank, with a little spit and no bubbles formed. We pulled
the banjo fitting off the air compressor and found the compressor and the
banjo fitting were functioning normal. I checked the the snot bottle after the
initial start and it was closed. We pulled the pop off valve and it looked normal,
spring was good. We pulled the tab on the side of the air start valve and
it operated and then closed.
We had no more air, too much noise to hear a leak and ran out of spit.
To recap. No leaks noted after main air valve opened. Main air tank does not refill
after engine start and leaks down to 0 after start. Emergency air has no
leaks.
Any ideas of where to look next? Thanks in advance for your expertise.
Rich
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=468174#468174
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| Subject: | Re: Losing Air After Start |
Rich,
As we discussed at S&F, the air start valve itself could be leaking
after it opens when you start the engine. Other than the air start
valve, if you have an actuator leaking, you should be able to hear air
leaking from the gear selector in the front cockpit. But you probably
need to be in a much quieter place than the S&F flight line to hear any
air leaking.
If the air start valve iscausing the leak down, the compressor most
likely will not be able to keep up with the leak. If the main air tank
is not leaking down with the main air valve closed, thatindicates the
leak is after the main air valve. ie: air start valve, actuators (gear,
flaps, uplock), air hose between the firewall and the air start valve.
Dennis
A. Dennis Savarese
334-546-8182 (mobile)
www.yak-52.com
Skype - Yakguy1
On 4/9/2017 8:58 AM, Rich Langer wrote:
>
> Here is my problem. I open the main air valve and the air pressure holds steady
at 36. After pressing the start button, the engine starts normally and for
roughly the next few minutes the pressure holds steady at 28. Then the pressure
starts to drop and goes to 0 in about 10 minutes. Emergency air is at 42 and
holds steady at 42. I was at Sun-n-fun and there was too much noise to hear
any leaks.
>
> Here is what we have checked so far. We checked the fill port for leaks, after
we added air from an air tank, with a little spit and no bubbles formed. We
pulled the banjo fitting off the air compressor and found the compressor and the
banjo fitting were functioning normal. I checked the the snot bottle after
the initial start and it was closed. We pulled the pop off valve and it looked
normal, spring was good. We pulled the tab on the side of the air start valve
and it operated and then closed.
>
> We had no more air, too much noise to hear a leak and ran out of spit.
>
> To recap. No leaks noted after main air valve opened. Main air tank does not
refill after engine start and leaks down to 0 after start. Emergency air has
no leaks.
>
> Any ideas of where to look next? Thanks in advance for your expertise.
>
> Rich
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=468174#468174
>
>
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| Subject: | Re: Losing air after start, been there! |
Good morning Rich, sorry to gear about your gremlin.
Very very similar event haopened to me in my CJ6 a few years back; after
beautiful start and on taxi out, could visibly watch my air gauge move in
the WRONG direction going down. Taxiied back to quiet-as-a-grave hangar
while I still had air for brakes. Turning air back on after shutdown and
pushing into hangar, listening I found the culprit: a likely-original flex
hose in LH main wheel well had a 1" longitudinal rupture from old age,
which opened under pressure. I could hear the very gentle hiss and the psi
was so low then that it was safe to feel it w/ fingertips. (PLS be careful,
feeling for leaks in moderate to high pressure air can be a bloody mistake!
Better in this case to listen and use soapy water/spit/piece of paper.)
Replaced ALL my landing gear hoses (Doug has them), and problem
disappeared.
Maybe this is a place to start the search?
Best,
Justin
N280NC
On Apr 9, 2017 9:05 AM, "Rich Langer" <rlanger2@comcast.net> wrote:
Here is my problem. I open the main air valve and the air pressure holds
steady at 36. After pressing the start button, the engine starts normally
and for roughly the next few minutes the pressure holds steady at 28. Then
the pressure starts to drop and goes to 0 in about 10 minutes. Emergency
air is at 42 and holds steady at 42. I was at Sun-n-fun and there was too
much noise to hear any leaks.
Here is what we have checked so far. We checked the fill port for leaks,
after we added air from an air tank, with a little spit and no bubbles
formed. We pulled the banjo fitting off the air compressor and found the
compressor and the banjo fitting were functioning normal. I checked the the
snot bottle after the initial start and it was closed. We pulled the pop
off valve and it looked normal, spring was good. We pulled the tab on the
side of the air start valve and it operated and then closed.
We had no more air, too much noise to hear a leak and ran out of spit.
To recap. No leaks noted after main air valve opened. Main air tank does
not refill after engine start and leaks down to 0 after start. Emergency
air has no leaks.
Any ideas of where to look next? Thanks in advance for your expertise.
Rich
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=468174#468174
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| Subject: | Re: Losing air after start, been there! |
Hey Rich-
I would check the three brake system belly valves as possible culprit (QS-1,
QS-2 and deposit valve). Not sure why engine running vs not running makes s
uch a big difference regarding any leak once you open the Main Air valve and
are apparently producing air via the compressor...Let us know what you find
.
Hoot
CJ / N82792
Sent from my iPhone
> On Apr 10, 2017, at 3:17 AM, Justin Drafts <draftsjust417@gmail.com> wrote
:
>
> Good morning Rich, sorry to gear about your gremlin.
> Very very similar event haopened to me in my CJ6 a few years back; after b
eautiful start and on taxi out, could visibly watch my air gauge move in the
WRONG direction going down. Taxiied back to quiet-as-a-grave hangar while I
still had air for brakes. Turning air back on after shutdown and pushing in
to hangar, listening I found the culprit: a likely-original flex hose in LH m
ain wheel well had a 1" longitudinal rupture from old age, which opened unde
r pressure. I could hear the very gentle hiss and the psi was so low then th
at it was safe to feel it w/ fingertips. (PLS be careful, feeling for leaks i
n moderate to high pressure air can be a bloody mistake! Better in this case
to listen and use soapy water/spit/piece of paper.)
> Replaced ALL my landing gear hoses (Doug has them), and problem disappeare
d.
>
> Maybe this is a place to start the search?
>
> Best,
> Justin
> N280NC
>
>
> On Apr 9, 2017 9:05 AM, "Rich Langer" <rlanger2@comcast.net> wrote:
>
> Here is my problem. I open the main air valve and the air pressure holds s
teady at 36. After pressing the start button, the engine starts normally and
for roughly the next few minutes the pressure holds steady at 28. Then the p
ressure starts to drop and goes to 0 in about 10 minutes. Emergency air is a
t 42 and holds steady at 42. I was at Sun-n-fun and there was too much noise
to hear any leaks.
>
> Here is what we have checked so far. We checked the fill port for leaks, a
fter we added air from an air tank, with a little spit and no bubbles formed
. We pulled the banjo fitting off the air compressor and found the compresso
r and the banjo fitting were functioning normal. I checked the the snot bott
le after the initial start and it was closed. We pulled the pop off valve an
d it looked normal, spring was good. We pulled the tab on the side of the ai
r start valve and it operated and then closed.
>
> We had no more air, too much noise to hear a leak and ran out of spit.
>
> To recap. No leaks noted after main air valve opened. Main air tank does n
ot refill after engine start and leaks down to 0 after start. Emergency air
has no leaks.
>
> Any ideas of where to look next? Thanks in advance for your expertise.
>
> Rich
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=468174#468174
>
>
>
>
>
>
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Message 5
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| Subject: | Re: Gyro compass adjustment |
Interesting Walt.
Are you trying to remove single or two cycle error?
Mark Bitterlich.
p.s. Swinging a compass is an art form. "First thing is to find the compass".
I think you might be talking about a flux valve. I have not worked on this
system in a YAK-52 and if it is what I think you are talking about, I have no
desire to, but I would like to know the facts regarding this particular system.
Can you educate me please? For what it is worth, my input is that first you
have to find a calibrated north south line. Good luck with that.
________________________________
From: owner-yak-list-server@matronics.com [owner-yak-list-server@matronics.com]
on behalf of Walter Lannon [wlannon@shaw.ca]
Sent: Sunday, April 09, 2017 1:36 AM
Subject: [Non-DoD Source] Re: Yak-List: Gyro compass adjustment
The gyrosyn compass is a gyro stabilized magnetic compass and is not tied to
the ADF. First thing is find the compass. Most likely in the aft
fuselage - remote from
electrical interference as much as possible.
It has a corrector unit like the standby compass and is swung in the same
manner but has an additional feature. Once the standard swing is complete
calculate the average algebraic sum of the corrections (+ or -), unlock and
rotate the entire compass in the correct direction to remove that error.
Walt
-----Original Message-----
From: Looigi
Sent: Saturday, April 08, 2017 4:57 PM
Subject: Yak-List: Gyro compass adjustment
Hi All,
We have just imported a Yak-52 into New Zealand from Italy. He is almost
ready for flight, but one job that remains is to do a compass swing.
Our plane has had the ADF system removed. I am not sure if that affects
things; I know the systems are sort of tied together.
The direct reading compasses are easy, but does anyone have any data on how
to adjust the gyro compass? I have flicked the switch on the control panel
to "South" and set the lattitude, but I am thinking I will need to fiddle
with it to sort the deviation.
Many thanks
Chris
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=468154#468154
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| Subject: | CJ6 Cone Bolt (or Taper Pin)... |
Hey,
I'm replacing a "cone bolt" or taper pin in the rudder balance (see pics below
- top one is fine), because the old one was corroded and not enough threads. The
2 I found in a box on this project and the new one I got from Doug are somewhat
different in sizes. They don't fit the old holes, most likely because they
were hand reamed for fit.
My problem is that the standard taper pin reamers (1:48), and the metric (1:50)
ones are the wrong "angle" - their "taper per foot" is either 1/4" per foot,
or just a little less for metric. These cone bolts measure out at about .5714-.5964"
per foot, or ~1.35-1.42 degrees.
I'm hesitant to just file away with a tapered rat...
Any ideas?
Stephen
PS - wings are almost on, and this rudder balance is the last thing in the tail!
--------
-
Dr. Stephen C. Hayne, Professor, CIS, Colorado State University
__!__
_____(_)_____ 666CJ
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=468221#468221
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| Subject: | Re: Gyro compass adjustment |
Hi Mark;
Damned if I know; That is way beyond my pay grade but I'm sure you could
help.
Yes; looking for the flux gate; transmitter; or whatever it may be called.
But in my 1965 CJ it is still a magnetic compass (though a very large one),
with a card and a viewing window to facilitate calibration. Entirely
possible I have made a grave error by assuming the Yak 52 uses the same
unit, a mistake I make too often.
The calibrated North/South line is usually included in the compass rose
which is found somewhere on most airport tarmacs. Can't say I have ever
seen one without that line, but then--------.
Don't know about "art form" but often the compass swing can be one hell of a
lot of work and, in Canada, is a requirement for every Annual Inspection and
Certification that I do.
Cheers;
Walt
-----Original Message-----
From: Bitterlich, Mark G CIV NAVAIR, WD
Sent: Sunday, April 09, 2017 7:51 PM
Subject: RE: [Non-DoD Source] Re: Yak-List: Gyro compass adjustment
<mark.bitterlich@navy.mil>
Interesting Walt.
Are you trying to remove single or two cycle error?
Mark Bitterlich.
p.s. Swinging a compass is an art form. "First thing is to find the
compass". I think you might be talking about a flux valve. I have not
worked on this system in a YAK-52 and if it is what I think you are talking
about, I have no desire to, but I would like to know the facts regarding
this particular system. Can you educate me please? For what it is worth,
my input is that first you have to find a calibrated north south line.
Good luck with that.
________________________________
From: owner-yak-list-server@matronics.com
[owner-yak-list-server@matronics.com] on behalf of Walter Lannon
[wlannon@shaw.ca]
Sent: Sunday, April 09, 2017 1:36 AM
Subject: [Non-DoD Source] Re: Yak-List: Gyro compass adjustment
The gyrosyn compass is a gyro stabilized magnetic compass and is not tied to
the ADF. First thing is find the compass. Most likely in the aft
fuselage - remote from
electrical interference as much as possible.
It has a corrector unit like the standby compass and is swung in the same
manner but has an additional feature. Once the standard swing is complete
calculate the average algebraic sum of the corrections (+ or -), unlock and
rotate the entire compass in the correct direction to remove that error.
Walt
-----Original Message-----
From: Looigi
Sent: Saturday, April 08, 2017 4:57 PM
Subject: Yak-List: Gyro compass adjustment
Hi All,
We have just imported a Yak-52 into New Zealand from Italy. He is almost
ready for flight, but one job that remains is to do a compass swing.
Our plane has had the ADF system removed. I am not sure if that affects
things; I know the systems are sort of tied together.
The direct reading compasses are easy, but does anyone have any data on how
to adjust the gyro compass? I have flicked the switch on the control panel
to "South" and set the lattitude, but I am thinking I will need to fiddle
with it to sort the deviation.
Many thanks
Chris
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=468154#468154
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| Subject: | Re: [Non-DoD Source] Re: Gyro compass adjustment |
Hi Guys,
Getting rid of the deviation is easy if the whole card needs to be adjusted, like
Walt says, just turn the flux valve to suit.
Does anyone know how to adjust the KM-8 Correction Mechanism that hides behind
the back seat on the yak-52? It looks like this..... https://forums.eagle.ru/attachment.php?attachmentid=135933&d=1457048380
I am guessing that by looking at it the adjusting know makes the same correction
as turning the flux valve does, but has anyone else played with it?
Cheers
Chris
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=468224#468224
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