Today's Message Index:
----------------------
1. 08:26 AM - Re: Tragedy strikes on of our own (Tim Gagnon)
2. 02:38 PM - Re: Re: Radio Troubleshooting (Bitterlich, Mark G CIV Det Cherry Point, MALS-14 64E)
3. 02:50 PM - Re: Radio Troubleshooting (Bitterlich, Mark G CIV Det Cherry Point, MALS-14 64E)
4. 02:51 PM - Re: Re: Compressor Issues (Bitterlich, Mark G CIV Det Cherry Point, MALS-14 64E)
5. 03:02 PM - Re: Compressor Issues (Bitterlich, Mark G CIV Det Cherry Point, MALS-14 64E)
6. 05:18 PM - Re: Aircraft Paint Shops (Craig Payne)
7. 07:15 PM - Re: Re: Compressor Issues (A. Dennis Savarese)
8. 09:01 PM - Re: Yak-50 Electrical System Troubleshooting (Harry Hirschman)
Message 1
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| Subject: | Re: Tragedy strikes on of our own |
--> Yak-List message posted by: "Tim Gagnon" <NiftyYak50@msn.com>
Just wanted to confirm that this is the story concerning the daycare provider.
If so, someone would get a late night visit....
If there is anything my wife and I can do, please tell Deon to let us know...prayers
incoming.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=67140#67140
Message 2
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| Subject: | Re: Radio Troubleshooting |
--> Yak-List message posted by: "Bitterlich, Mark G CIV Det Cherry Point, MALS-14
64E" <mark.bitterlich@navy.mil>
Troubleshooting antenna problems is really not best approached by the
premise of just changing parts and then see what happens.
Never-the-less, it is possible that the radio squealing when you
transmit is indeed caused by a high VSWR issue. That issue can be
caused by a bad antenna, OR bad coax, OR bad connectors. Any one of the
three can cause an impedance mismatch. The proper troubleshooting
method is to either install a directional wattmeter inline and measure
forward and reverse power, or... Use an antenna analyzer such as the MFJ
series. The latter are wonderful devices and every group of airplane
owners at a local airport should spring for one so that it can be
available for just these kind of issues.
To answer your question:
All of the Russian VHF radios use the world wide standard of 50 ohm
systems. Thus our coax and our antennas will work just fine with their
radios, assuming you can the proper connectors to hook things together
with.
The best way to troubleshoot your problem is to connect a 50 ohm dummy
load to your Balkan 5, and then test it. If the squeal goes away and
you have good side-tone, then you indeed have a coax/antenna issue. If
the problem remains when using a dummy load, and it does it with
multiple radios, then look for bad wiring from the mike connector to the
radio itself.
Make sure you put those pots back where they were when you are done.
The TRANSMIT AUDIO LEVEL (MOA) adjustment actually adjusts percentage of
modulation for the Amplitude Modulated transmitter (AM). If set too
high, this will cause bad splatter and adjacent channel interference and
that is a bad thing. Since you have already messed with it without the
proper test equipment available, the best "fix" you can do there is to
listen to your radio from ANOTHER AIRPLANE and then listen to say the
"tower" transmitting. Adjust the MOA in your Balkan 5 so that it does
not sound any "louder" then anyone else's radio. This is crude, but
better than nothing. Avoid turning the MOA pot around if possible.
Mark Bitterlich
N50YK
-----Original Message-----
From: owner-yak-list-server@matronics.com
[mailto:owner-yak-list-server@matronics.com] On Behalf Of Mike Beresford
Sent: Tuesday, October 10, 2006 16:19
Subject: Re: Yak-List: Re: Radio Troubleshooting
--> Yak-List message posted by: Mike Beresford
--> <mike_beresford@yahoo.co.uk>
Hi all
No great success with adjusting the pots.
I have an idea that the problem is aerial related. Two radios have given
similar problems, so I'm of the opinion that the fault is outside the
actual radio unit.
Since the intercom is working, I'm assuming that the problem is not
related to the microphone set-up.
Pushing the radio PTT causes a squeeling noise in the headset, which can
only be eliminated by turning the left hand (looking back) pot on the
Baklan radio right down. Turning the right hand pot alters the pitch of
the sound. (NB radio pots, not the panel controls) Is this perhaps some
form of feedback through the system?
A previous owner had some VHF equipment fitted that is no longer in the
aircraft, save for an American VHF antenna. If I make a cable with the
correct fittings, is there any reason that I can't connect this antenna
to the BAKLAN-5? This may help determine if the Russian aerial system is
the cause of the problems.
Blue skies
Mike
--- Rob Rowe <yak-list@robrowe.plus.com> wrote:
> --> Yak-List message posted by: "Rob Rowe"
> <yak-list@robrowe.plus.com>
>
> Hi Mike,
>
> You might try adjusting the two slotted pots on the front panel of the
> Baklan 5 transceiver ... sounds like you have a -52 so just pop the
> tray lid off in the rear cockpit to access the avionics bay & you'll
> be able to see them (transceiver is the left most box, looking
> rearward).
>
> They're labelled (in Cyrillic, so nearest chars
> shown) "Cn" & "MOA".
>
> "Cn" is receive audio level control.
>
> "MOA" is transmit audio level control.
>
> Your transmit carrier wave only problem might be over or under
> modulation ... so try adjusting "MOA"
> down as well as up to see if this improves the quality.
>
> There are some other headset impedance mismatch issues on the receive
> side that might impact intercom longevity, but lets try & get the
> basics sorted first.
>
> I'm off-line for a few days so will catch up with you later in the
> week to see how you've got on.
>
> Cheers, Rob Rowe
>
>
>
>
> Read this topic online here:
>
>
http://forums.matronics.com/viewtopic.php?p=66714#66714
>
>
>
>
>
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>
>
> browse
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Message 3
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| Subject: | Radio Troubleshooting |
--> Yak-List message posted by: "Bitterlich, Mark G CIV Det Cherry Point, MALS-14
64E" <mark.bitterlich@navy.mil>
Ring out the microphone wiring to the radio. I suspect that it was
tapped and fed to the new radio and never properly disconnected since
they pulled the Balkan 5 R/T and it would have just led to a dead end.
Make sure the Balkan 5 you are testing with works good in another known
good aircraft. Lastly, suspect antenna coax problems as a bad "Z"
mismatch could cause this problem.
My money is that the wiring is messed up, regardless of whether the ICS
works or not.
Mark Bitterlich
N50YK
P.s. I've repaired a number of Balkan 5's, so I do have a little
experience anyway.
-----Original Message-----
From: owner-yak-list-server@matronics.com
[mailto:owner-yak-list-server@matronics.com] On Behalf Of Mike Beresford
Sent: Sunday, October 08, 2006 3:07
Subject: Yak-List: Radio Troubleshooting
--> Yak-List message posted by: Mike Beresford
--> <mike_beresford@yahoo.co.uk>
Hi all
I'm trying to sort out a radio problem, would appreciate any advice from
the experts.
When the aircraft was with its previous owner, the
Baklan-5 failed. The owner fitted a Bendix King, and simply stopped
using the original set-up. As far as I know the PTT button on the fron
throttle is the only part of the system that has any connection to the
old radio.
I've been trying to get the old system working again, as I preferred the
PTT intercom / radio setup. First had some local radio boffins look at
the old Baklan-5, but they couldn;t do anything with it. They put
another Baklan-5 in there, but couldn't get it to transmit properly. At
that point they gave up.
I've now obtained a replacement radio and selector from Mark, which I
fitted yesterday. I am finding
that:
- The intercoms work fine, just a little soft.
- The radio receives, again a little soft
- When transmitting there is an odd wave-like noise in the headset
- Tower report "carrier wave only" (tried from both
cockpits)
I went through all the aerial connections, but couldn't see anything out
of place. Since the intercoms work, I suspect it's not microphone wiring
related. The Bendix King is "off", so it shouldn't be interfering with
the Baklan. As far as I can see, the Bendix-King has its own antenna.
Does anyone have any suggestions on where to look next?
Thanks
Mike
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Message 4
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| Subject: | Re: Compressor Issues |
--> Yak-List message posted by: "Bitterlich, Mark G CIV Det Cherry Point, MALS-14
64E" <mark.bitterlich@navy.mil>
Think so? Pull the starting air distributor off, and then try to put it
back on and get it to work again.
Mark
-----Original Message-----
From: owner-yak-list-server@matronics.com
[mailto:owner-yak-list-server@matronics.com] On Behalf Of A. Dennis
Savarese
Sent: Saturday, October 07, 2006 20:27
Subject: Re: Yak-List: Re: Compressor Issues
--> Yak-List message posted by: "A. Dennis Savarese"
--> <dsavarese@elmore.rr.com>
Personally, I think it's the worse job in the engine compartment.
Dennis
----- Original Message -----
From: "Tim Gagnon" <NiftyYak50@msn.com>
Sent: Saturday, October 07, 2006 2:29 PM
Subject: Yak-List: Re: Compressor Issues
> --> Yak-List message posted by: "Tim Gagnon" <NiftyYak50@msn.com>
>
> This thing is a mofo to get off. I will have to slam the Russians for
this
> one. A bitch of a part surrounded by a fine airplane.
>
> I have three nuts off and feel like I have been kicked in mine. I have
to
> step away and took another look at this.....
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=66408#66408
>
>
>
Message 5
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| Subject: | Compressor Issues |
--> Yak-List message posted by: "Bitterlich, Mark G CIV Det Cherry Point, MALS-14
64E" <mark.bitterlich@navy.mil>
By this time, I guess you have for sure determined that it is indeed
the compressor that is bad. Normally, it is either the banjo fitting
leaking, or the line going from the compressor banjo fitting to the snot
valve itself that has failed.
The best method to determine this is to remove the line from the snot
valve and reverse pressurize the line from some high pressure source.
You can then hear where the leak is coming from and fix it.
9 times out of 10, it is NOT the compressor.....
Mark Bitterlich
N50YK
-----Original Message-----
From: owner-yak-list-server@matronics.com
[mailto:owner-yak-list-server@matronics.com] On Behalf Of Tim Gagnon
Sent: Friday, October 06, 2006 9:00
Subject: Yak-List: Compressor Issues
--> Yak-List message posted by: "Tim Gagnon" <NiftyYak50@msn.com>
So I take off and am flying along when I do an instrument check and my
primary pressure is not moving. Not going down and certainly not going
up! I turn around, head back to the airport and land without incident.
Taxing in I am using air that is not being replenished.
Pull the "output" line off the snot valve, have a brave mechanic put his
finger over the port and crank the engine....nothing! So, I have a
compressor that is Tango Uniform.
I have been told that the coupling could be inop and could replace just
that instead of the whole pump. I am in need of either.......sources??
Thanks in advance.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=66159#66159
Message 6
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| Subject: | Re: Aircraft Paint Shops |
Too bad it ended up like that. I'll still re-assembling mine from the shop just
on the other side of the airport. The owner does not advertise and only has a
simple listing in the Yellow Pages, just a small sign on one door. With a constant
stream of mid-size jets at $60K per job, and spam of all sizes coming through
the door, ad monies would be a waste.
We sat in the shade under the wing one hot summer day (in Florida no less) and
negotiated a deal. Just a handshake agreement and a generalized target date. Half
up front when the airplane came in and the other half with sales tax on the
way out. The deal was that I worked there in his shop on my airplane, laying
out the markings, taking it apart and putting it back together. I also did the
stripping and some prep work in my own hanger.
One tip, get test panels made up, 18" wide by however long it takes to view colors
side by side. However, at $51/qt for each sample, I decided to make up my
mind at the $300 level.
I cannot imagine 60 hours of body work. I did most of mine but the pros in the
shop worked some other spots in the fraction of the time it took me. I wasn't
charged extra but was gently reminded that they could not let an airplane out
of THEIR shop with highly visible dings.
In all, it was an interesting experience and I learned a lot about what it takes
to process an airplane through a shop.
Craig Payne
cpayne@joimail.com
Message 7
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| Subject: | Re: Compressor Issues |
--> Yak-List message posted by: "A. Dennis Savarese" <dsavarese@elmore.rr.com>
You're right Mark. You win!
Dennis
----- Original Message -----
From: "Bitterlich, Mark G CIV Det Cherry Point, MALS-14 64E"
<mark.bitterlich@navy.mil>
Sent: Wednesday, October 11, 2006 4:51 PM
Subject: RE: Yak-List: Re: Compressor Issues
> --> Yak-List message posted by: "Bitterlich, Mark G CIV Det Cherry Point,
> MALS-14 64E" <mark.bitterlich@navy.mil>
>
> Think so? Pull the starting air distributor off, and then try to put it
> back on and get it to work again.
>
> Mark
>
>
> -----Original Message-----
> From: owner-yak-list-server@matronics.com
> [mailto:owner-yak-list-server@matronics.com] On Behalf Of A. Dennis
> Savarese
> Sent: Saturday, October 07, 2006 20:27
> To: yak-list@matronics.com
> Subject: Re: Yak-List: Re: Compressor Issues
>
> --> Yak-List message posted by: "A. Dennis Savarese"
> --> <dsavarese@elmore.rr.com>
>
> Personally, I think it's the worse job in the engine compartment.
> Dennis
>
> ----- Original Message -----
> From: "Tim Gagnon" <NiftyYak50@msn.com>
> To: <yak-list@matronics.com>
> Sent: Saturday, October 07, 2006 2:29 PM
> Subject: Yak-List: Re: Compressor Issues
>
>
>> --> Yak-List message posted by: "Tim Gagnon" <NiftyYak50@msn.com>
>>
>> This thing is a mofo to get off. I will have to slam the Russians for
> this
>> one. A bitch of a part surrounded by a fine airplane.
>>
>> I have three nuts off and feel like I have been kicked in mine. I have
> to
>> step away and took another look at this.....
>>
>>
>>
>>
>> Read this topic online here:
>>
>> http://forums.matronics.com/viewtopic.php?p=66408#66408
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>
>
>
Message 8
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| Subject: | Re: Yak-50 Electrical System Troubleshooting |
--> Yak-List message posted by: Harry Hirschman <hairball192@yahoo.com>
All:
The problem with my Yak-50's electrical system has been found and repaired, and
the working fix will get prettied up by a pro this weekend. Advisory info for
those with similar planes below.
A heartfelt thanks to all who offered suggestions on how to find/fix it and to
those who provided schematics. I'd specifically like to thank Mark Bitterlich,
Rob Rowe, and Jorgen. Experienced hands of some folks at Palo Alto airport
located the problem. Dave Masters was relentless in his pursuit of understanding
Russian circuit diagrams and troubleshooting the system until the problem
was found and fixed, so a special thanks goes out to him.
Here's what to check on other planes:
The Yak-50's relay box is on the fuselage side of the firewall. There is a 45-pin
connector with a thick wire bundle attached. Most of the wires originate
at the instrument panel and join into the bundle running forward along the left
side of the fuselage. The bundle takes a hard right at the firewall and is
routed through and around other components until it reaches the relay box. Both
the air bottles are mounted aft of the firewall. There are four air lines
and one fuel line with fittings attached to the firewall and the wire bundle is
routed close to the topmost air line fitting. I'm sure a Russian engineer thought
of this very failure mode when they decided between the fuel line and the
air line being on top. Although the wire bundle is clamped very securely,
it was routed in contact with the uppermost fitting and the vibration chafed through
first one wire (hence the left gear down light symptom) and then others.
When it chafed through additional wires they shorted and arked, burning through
or damaging about seven wires in the bundle. Mark is right, I was indeed
very lucky.
So I recommend taking a close look at the main wire bundle to ensure it is not
touching anything the next time you're in your hell-hole with a flashlight. You
have to look pretty darn close to tell.
Thanks again to everyone who contributed their time, experience and brain cells
to help a guy they've never met. That's what this community is all about.
Sincerely,
Harry
----- Original Message ----
From: Harry Hirschman <hairball192@yahoo.com>
Sent: Monday, September 11, 2006 11:37:50 AM
Subject: Yak-List: Yak-50 Electrical System Troubleshooting
--> Yak-List message posted by: Harry Hirschman <hairball192@yahoo.com>
All:
I'd appreciate any assistance people are willing to
provide to assist me in troubleshooting my Yak-50's
electrical system.
Symptoms:
1. Chronic problem of the left gear down indicator
light on or off-on when landing gear is up (with two
red up-and-locked lights also on)
2. Recently all annunciator lights (all four gear
indicators, generator, Over-G, chip, all cells on fuel
ladder) flashing on-off; Last flight all annunciator
lights were on and steady (same look as pushing the
press-to-test by the gear handle)
3. My electrical switches are labeled "Gear" and
"Inst"; The "Inst" switch controls the proper reading
of the fuel ladder (ie: it reads the correct amount of
fuel with this switch on), generator annunciator light
and engine instruments; The "gear" switch controls the
landing gear position indicator lights, all the light
cells on the fuel ladder (same as pushing the "k"
button to test the fuel indicator), the chip light and
the over-G light
In troubleshooting over the weekend, I performed the
following steps and got the following results:
1. Turned on the following switches: Battery, inst,
and gear; All annunciator lights came on, I heard what
I think is some kind of electrical motor wind up for a
few seconds, then the "Gear" switch-breaker flipped
itself off and the associated annunciator lights went
off and the sound ceased
2. After cycling the switch a half dozen times with
my head under the panel to try to locate the noise,
the motor stopped coming on with the gear switch, but
it continues to break to the off position after
several seconds in the on position; There is about a 2
amp draw with the "gear" switch on as indicated by the
aircraft guage; The noise was coming from behind the
instrument panel, but I couldn't locate the component
3. There are two wires attached to the "gear" switch;
Removed the wire labeled 05-CW1 and turned on the
batt, inst and gear switches with the same result -- 2
amp draw and gear switch breaks to off after several
seconds
4. Removed the wire labeled 05-CW2-01 and turned on
the batt, inst and gear switches and now the gear
switch does not break, the elec system remains on; The
landing gear indicator lights, fuel ladder lights,
chip light, and over-G light do not illuminate (proper
fuel indication, generator light on, and engine
instruments are powered) -- so the bad wire is this
one, I think
5. Re-installed both wires and verified that the
system fails in the same way as before
6. Friends manually held both landing gear position
squat switches in the "gear-up" position and turned
the electrical switches off with the same result --
Gear switch breaks to off after several seconds
7. Disconnected the left gear position squat switch
at the bus bar in the wing root by removing the lower
three of the four wires (I believe the top wire is for
pitot heat) and turned on the batt, inst and gear
switches -- GOT IT -- Same result as step 4 above --
Gear switch does not break, the elec system remains on
with a right gear down green light; I'm fuzzy on this
part, but I believe I did the push-to-test for the
annunciator lights and all worked EXCEPT the chip
light and over-G light
8. And then the plot thickens -- With the electrical
system on, manually depressed the RIGHT landing gear
squat switch -- The RIGHT gear down light went out and
the LEFT gear up light went on (hopefully a simple
crossed wire) AND got a 2.5 amp draw and the gear
switch broke to the off position after several seconds
Only two things scare me and both of them are
electricity, so I wouldn't have been able to do any of
this without the able help of some airport buds (Ken
and John). I hope I've given those who know something
about this enough information to narrow things down
for me.
I've got a couple of specific questions in addition to
the overall recommendations I hope will be
forthcoming:
- What electrical component do you think was making
the noise described in troubleshooting steps 1 and 2?
- It looks like there are separate parts for the left
and right landing gear squat switches; Is that true?
- From anyone out there has removed the entire Russian
electrical system and rewired new, how much time and
money did that take? Do you have a parts list for the
new system?
- Does anyone out there have an electrical diagram for
the Yak-50?
Many thanks in advance to everyone who's read this far
and to those who take the time to respond.
Regards,
Harry
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