Today's Message Index:
----------------------
1. 10:18 AM - Generator failure/ loss of electrical power (Serge Svoysky)
2. 12:16 PM - Re: Generator failure/ loss of electrical power (Roger Kemp)
3. 12:36 PM - Re: [Non-DoD Source] Generator failure/ loss of electrical power (Bitterlich, Mark G CIV NAVAIR, WD)
4. 12:43 PM - Re: Generator failure/ loss of electrical power (Pedro Cerveira Pinto)
5. 03:20 PM - Re: [Non-DoD Source] Generator failure/ loss of electrical power (Roger Kemp)
6. 05:07 PM - Re: Generator failure/ loss of electrical power (A. Dennis Savarese)
7. 05:31 PM - Re: [Non-DoD Source] Generator failure/ loss of electrical power (A. Dennis Savarese)
8. 06:04 PM - Re: Generator failure/ loss of electrical power (Cerveira Pinto)
9. 06:41 PM - Re: Generator failure/ loss of electrical power (A. Dennis Savarese)
10. 07:55 PM - Yak 55M Throttle Cable (Jason .)
Message 1
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| Subject: | Generator failure/ loss of electrical power |
Hello all,
Looking for advice on the following situation- everything looked normal on the
ground; "generator failure" on idle, but went away with RPM increase, proceeded
to take off and got "generator failure" right away on departure. Landed to check
on the ground again, all looked normal, departed, light came on. Decided
to go for a short flight, started losing all electrical equipment one by one starting
with the radio, but got it all back on final approach when power was reduced.
Worked fine (no light, charge as usual) on the ground.
I'd appreciate for any help!
YAK52 in NJ
Thanks,
serge
Message 2
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| Subject: | Re: Generator failure/ loss of electrical power |
What was your voltage meter doing? Was it the "GenFault" light that came on and
at what %RPM were you getting the light.
Doc
Doc
Sent from my iPad
> On May 12, 2017, at 12:16 PM, Serge Svoysky <ssvoysky@gmail.com> wrote:
>
>
> Hello all,
> Looking for advice on the following situation- everything looked normal on the
ground; "generator failure" on idle, but went away with RPM increase, proceeded
to take off and got "generator failure" right away on departure. Landed to
check on the ground again, all looked normal, departed, light came on. Decided
to go for a short flight, started losing all electrical equipment one by one
starting with the radio, but got it all back on final approach when power was
reduced. Worked fine (no light, charge as usual) on the ground.
>
> I'd appreciate for any help!
> YAK52 in NJ
>
> Thanks,
> serge
>
>
>
Message 3
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| Subject: | Generator failure/ loss of electrical |
power
I am assuming we are dealing with a stock Russian generator system.
It appears that the generator light is telling you the truth. The first thing
I would suggest is that you keep a close eye on the volt/amp meter. Some YAK-52's
have a meter that only shows current, and some have the meter with a button
on it that allows you to also check voltage. Which do you have?
This meter tells you a lot about what is going on with your system. You should
be running checks and looking at readings anytime you have a generator light
issue.
The generator light is controlled by the MAIN CONTACTOR RELAY on the Combined Device
DMR-200 relay assembly. When the MAIN CONTACTOR closes, the generator
light goes OUT. When that MAIN CONTACTOR OPENS the generator light comes on.
So what appears to be happening in your case, is that when power is increased,
the generator is working, and the MAIN CONTACTOR closes. Generator power has
to be above battery voltage for the main contactor to close. So the generator
voltage is there, the main contactor closes and everything is working.
After take-off, the main contactor opened, we do not know why yet but it was not
over-voltage, because that trips out a small breaker which has to be reset
to get power back. Since you did not have to reset anything, it was not over-voltage.
However, if the generator voltage dropped, the main contactor would
open, the light would come on, and I suspect this is what happened.
What is worse is that it is clearly apparent that you battery condition is very
bad. When you lost the generator, the battery should have powered your whole
aircraft for at least 30 minutes!
So first things first, put a hand held volt meter on your batteries (engine not
running) and check the voltage when you turn on the Master and verify that your
battery voltage maintains 22-24 volts or so. If the voltage starts dropping
to something like 19 or lower, you have weak and/or bad batteries. Replace
them. The Russian system reverse current relay RELIES on you having good batteries.
Period end of story. If you have weak batteries, all kinds of bad things
happen, and it appears from your story that you might very well have stumbled
into that condition.
Once we get past the battery, the next issues is your generator system. If you
are lucky, you will have a meter installed in the aircraft that shows voltage,
but that is BUSS voltage. It will not tell you what the generator is doing
when the GEN LIGHT IS ON.
The generator light can come on the way you are describing if you have a bad generator,
a bad voltage regulator, or a bad Combined Device Relay. As I said,
make sure you have good batteries before you proceed to the next step!
Take the cover off the generator that provides access to the generator wiring.
First check that you don't have a loose nut on the wires. It can happen and
cause intermittent output, which would cause this exact gripe. Moving on, connect
a volt-meter to the + and - wires. PLUS AND MINUS, so they won't just
fall off because you are going to start the engine with these wires on, with the
meter back in the cockpit. You can put the cowling back on if you want. Start
the engine and verify that once you are above idle, the voltage stabilizes
at about 28 VDC. Run the engine up quickly to as high as you can holding the
brakes. Be safe. The voltage should stay rock steady at 28 VDC. Depending
on exactly what it does will tell us if it is a bad generator, or bad voltage
regulator.
Mark
-----Original Message-----
From: owner-yak-list-server@matronics.com [mailto:owner-yak-list-server@matronics.com] On Behalf Of Serge Svoysky
Sent: Friday, May 12, 2017 1:16 PM
Subject: [Non-DoD Source] Yak-List: Generator failure/ loss of electrical power
Hello all,
Looking for advice on the following situation- everything looked normal on the
ground; "generator failure" on idle, but went away with RPM increase, proceeded
to take off and got "generator failure" right away on departure. Landed to check
on the ground again, all looked normal, departed, light came on. Decided
to go for a short flight, started losing all electrical equipment one by one starting
with the radio, but got it all back on final approach when power was reduced.
Worked fine (no light, charge as usual) on the ground.
I'd appreciate for any help!
YAK52 in NJ
Thanks,
serge
Message 4
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| Subject: | Re: Generator failure/ loss of electrical power |
Hi Serge
Have you checked the regulator voltage?
Check and register voltage and negative/positive amperes(meaning battery is
charging) at diferent settings
Adjust regulator voltage with a srew driver to obtain 25-26 volts
Also check batteries condition
Cheers
2017-05-12 18:16 GMT+01:00 Serge Svoysky <ssvoysky@gmail.com>:
>
> Hello all,
> Looking for advice on the following situation- everything looked normal on
> the ground; "generator failure" on idle, but went away with RPM increase,
> proceeded to take off and got "generator failure" right away on departure.
> Landed to check on the ground again, all looked normal, departed, light
> came on. Decided to go for a short flight, started losing all electrical
> equipment one by one starting with the radio, but got it all back on final
> approach when power was reduced. Worked fine (no light, charge as usual) on
> the ground.
>
> I'd appreciate for any help!
> YAK52 in NJ
>
> Thanks,
> serge
>
>
--
Pedro Cerveira Pinto
Message 5
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| Subject: | Re: Generator failure/ loss of electrical |
power
Good gouge Mark. Knew you would surface on this topic.
Doc
Sent from my iPad
> On May 12, 2017, at 2:33 PM, Bitterlich, Mark G CIV NAVAIR, WD <mark.bitterlich@navy.mil>
wrote:
>
>
> I am assuming we are dealing with a stock Russian generator system.
>
> It appears that the generator light is telling you the truth. The first thing
I would suggest is that you keep a close eye on the volt/amp meter. Some YAK-52's
have a meter that only shows current, and some have the meter with a button
on it that allows you to also check voltage. Which do you have?
>
> This meter tells you a lot about what is going on with your system. You should
be running checks and looking at readings anytime you have a generator light
issue.
>
> The generator light is controlled by the MAIN CONTACTOR RELAY on the Combined
Device DMR-200 relay assembly. When the MAIN CONTACTOR closes, the generator
light goes OUT. When that MAIN CONTACTOR OPENS the generator light comes on.
>
> So what appears to be happening in your case, is that when power is increased,
the generator is working, and the MAIN CONTACTOR closes. Generator power has
to be above battery voltage for the main contactor to close. So the generator
voltage is there, the main contactor closes and everything is working.
>
> After take-off, the main contactor opened, we do not know why yet but it was
not over-voltage, because that trips out a small breaker which has to be reset
to get power back. Since you did not have to reset anything, it was not over-voltage.
However, if the generator voltage dropped, the main contactor would
open, the light would come on, and I suspect this is what happened.
>
> What is worse is that it is clearly apparent that you battery condition is very
bad. When you lost the generator, the battery should have powered your whole
aircraft for at least 30 minutes!
>
> So first things first, put a hand held volt meter on your batteries (engine not
running) and check the voltage when you turn on the Master and verify that
your battery voltage maintains 22-24 volts or so. If the voltage starts dropping
to something like 19 or lower, you have weak and/or bad batteries. Replace
them. The Russian system reverse current relay RELIES on you having good batteries.
Period end of story. If you have weak batteries, all kinds of bad
things happen, and it appears from your story that you might very well have stumbled
into that condition.
>
> Once we get past the battery, the next issues is your generator system. If
you are lucky, you will have a meter installed in the aircraft that shows voltage,
but that is BUSS voltage. It will not tell you what the generator is doing
when the GEN LIGHT IS ON.
>
> The generator light can come on the way you are describing if you have a bad
generator, a bad voltage regulator, or a bad Combined Device Relay. As I said,
make sure you have good batteries before you proceed to the next step!
>
> Take the cover off the generator that provides access to the generator wiring.
First check that you don't have a loose nut on the wires. It can happen and
cause intermittent output, which would cause this exact gripe. Moving on,
connect a volt-meter to the + and - wires. PLUS AND MINUS, so they won't just
fall off because you are going to start the engine with these wires on, with
the meter back in the cockpit. You can put the cowling back on if you want.
Start the engine and verify that once you are above idle, the voltage stabilizes
at about 28 VDC. Run the engine up quickly to as high as you can holding
the brakes. Be safe. The voltage should stay rock steady at 28 VDC. Depending
on exactly what it does will tell us if it is a bad generator, or bad voltage
regulator.
>
> Mark
>
>
> -----Original Message-----
> From: owner-yak-list-server@matronics.com [mailto:owner-yak-list-server@matronics.com] On Behalf Of Serge Svoysky
> Sent: Friday, May 12, 2017 1:16 PM
> To: yak-list@matronics.com
> Subject: [Non-DoD Source] Yak-List: Generator failure/ loss of electrical power
>
>
> Hello all,
> Looking for advice on the following situation- everything looked normal on the
ground; "generator failure" on idle, but went away with RPM increase, proceeded
to take off and got "generator failure" right away on departure. Landed to
check on the ground again, all looked normal, departed, light came on. Decided
to go for a short flight, started losing all electrical equipment one by one
starting with the radio, but got it all back on final approach when power was
reduced. Worked fine (no light, charge as usual) on the ground.
>
> I'd appreciate for any help!
> YAK52 in NJ
>
> Thanks,
> serge
>
>
>
>
>
>
>
Message 6
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| Subject: | Re: Generator failure/ loss of electrical power |
25-26 Volts is too low if you want to charge the battery. Should be set
to 28.5 volts
Dennis
A. Dennis Savarese
334-546-8182 (mobile)
www.yak-52.com
Skype - Yakguy1
On 5/12/2017 3:41 PM, Pedro Cerveira Pinto wrote:
> Hi Serge
> Have you checked the regulator voltage?
> Check and register voltage and negative/positive amperes(meaning
> battery is charging) at diferent settings
> Adjust regulator voltage with a srew driver to obtain 25-26 volts
>
> Also check batteries condition
>
> Cheers
>
> 2017-05-12 18:16 GMT+01:00 Serge Svoysky <ssvoysky@gmail.com
> <mailto:ssvoysky@gmail.com>>:
>
> <mailto:ssvoysky@gmail.com>>
>
> Hello all,
> Looking for advice on the following situation- everything looked
> normal on the ground; "generator failure" on idle, but went away
> with RPM increase, proceeded to take off and got "generator
> failure" right away on departure. Landed to check on the ground
> again, all looked normal, departed, light came on. Decided to go
> for a short flight, started losing all electrical equipment one by
> one starting with the radio, but got it all back on final approach
> when power was reduced. Worked fine (no light, charge as usual) on
> the ground.
>
> I'd appreciate for any help!
> YAK52 in NJ
>
> Thanks,
> serge
> ===================================
> List" rel="noreferrer"
> target="_blank">http://www.matronics.com/Navigator?Yak-List
> ===================================
> FORUMS -
> eferrer" target="_blank">http://forums.matronics.com
> ===================================
> WIKI -
> errer" target="_blank">http://wiki.matronics.com
> ===================================
> b Site -
> -Matt Dralle, List Admin.
> rel="noreferrer" target="_blank">http://www.matronics.com/contribution
> ===================================
>
>
> --
> Pedro Cerveira Pinto
>
Message 7
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| Subject: | Re: Generator failure/ loss of electrical |
power
Mark IS the man!Dennis
From: Roger Kemp <f16viperdoc@me.com>
To: yak-list@matronics.com
Sent: Friday, May 12, 2017 6:21 PM
Subject: Re: [Non-DoD Source] Yak-List: Generator failure/ loss of electri
cal power
Good gouge Mark. Knew you would surface on this topic.
Doc
Sent from my iPad
> On May 12, 2017, at 2:33 PM, Bitterlich, Mark G CIV NAVAIR, WD <mark.bitt
erlich@navy.mil> wrote:
>
.bitterlich@navy.mil>
>
> I am assuming we are dealing with a stock Russian generator system.=C2-
>
> It appears that the generator light is telling you the truth.=C2- The f
irst thing I would suggest is that you keep a close eye on the volt/amp met
er.=C2- Some YAK-52's have a meter that only shows current, and some have
the meter with a button on it that allows you to also check voltage.=C2-
Which do you have?=C2-
>
> This meter tells you a lot about what is going on with your system.=C2-
=C2- You should be running checks and looking at readings anytime you ha
ve a generator light issue.=C2-
>
> The generator light is controlled by the MAIN CONTACTOR RELAY on the Comb
ined Device DMR-200 relay assembly.=C2- When the MAIN CONTACTOR closes, t
he generator light goes OUT.=C2- When that MAIN CONTACTOR OPENS the gener
ator light comes on.=C2-
>
> So what appears to be happening in your case, is that when power is incre
ased, the generator is working, and the MAIN CONTACTOR closes.=C2- Genera
tor power has to be above battery voltage for the main contactor to close.
=C2- So the generator voltage is there, the main contactor closes and eve
rything is working.=C2-
>
> After take-off, the main contactor opened,=C2- we do not know why yet b
ut it was not over-voltage, because that trips out a small breaker which ha
s to be reset to get power back.=C2- Since you did not have to reset anyt
hing, it was not over-voltage.=C2- However, if the generator voltage drop
ped, the main contactor would open, the light would come on, and I suspect
this is what happened.=C2-
>
> What is worse is that it is clearly apparent that you battery condition i
s very bad.=C2- When you lost the generator, the battery should have powe
red your whole aircraft for at least 30 minutes!=C2-
>
> So first things first, put a hand held volt meter on your batteries (engi
ne not running) and check the voltage when you turn on the Master and verif
y that your battery voltage maintains 22-24 volts or so.=C2- If the volta
ge starts dropping to something like 19 or lower, you have weak and/or bad
batteries.=C2- Replace them.=C2- The Russian system reverse current rel
ay RELIES on you having good batteries.=C2- Period end of story.=C2- If
you have weak batteries, all kinds of bad things happen, and it appears fr
om your story that you might very well have stumbled into that condition.
=C2-
>
> Once we get past the battery, the next issues is your generator system.
=C2- If you are lucky, you will have a meter installed in the aircraft th
at shows voltage, but that is BUSS voltage.=C2- It will not tell you what
the generator is doing when the GEN LIGHT IS ON.=C2- =C2-
>
> The generator light can come on the way you are describing if you have a
bad generator, a bad voltage regulator, or a bad Combined Device Relay.=C2
- As I said, make sure you have good batteries before you proceed to the
next step!=C2-
>
> Take the cover off the generator that provides access to the generator wi
ring.=C2- First check that you don't have a loose nut on the wires.=C2-
It can happen and cause intermittent output, which would cause this exact
gripe.=C2- Moving on, connect a volt-meter to the + and -=C2- wires.=C2
- PLUS AND MINUS, so they won't just fall off because you are going to st
art the engine with these wires on, with the meter back in the cockpit. You
can put the cowling back on if you want.=C2- Start the engine and verify
that once you are above idle, the voltage stabilizes at about 28 VDC.=C2
- Run the engine up quickly to as high as you can holding the brakes.=C2
- Be safe.=C2- The voltage should stay rock steady at 28 VDC.=C2- Dep
ending on exactly what it does will tell us if it is a bad generator, or ba
d voltage regulator.=C2-
>
> Mark
>
>
> -----Original Message-----
> From: owner-yak-list-server@matronics.com [mailto:owner-yak-list-server@m
atronics.com] On Behalf Of Serge Svoysky
> Sent: Friday, May 12, 2017 1:16 PM
> To: yak-list@matronics.com
> Subject: [Non-DoD Source] Yak-List: Generator failure/ loss of electrical
power
>
>
> Hello all,
> Looking for advice on the following situation- everything looked normal o
n the ground; "generator failure" on idle, but went away with RPM increase,
proceeded to take off and got "generator failure" right away on departure.
Landed to check on the ground again, all looked normal, departed, light ca
me on. Decided to go for a short flight, started losing all electrical equi
pment one by one starting with the radio, but got it all back on final appr
oach when power was reduced. Worked fine (no light, charge as usual) on the
ground.
>
> I'd appreciate for any help!
> YAK52 in NJ
>
> Thanks,
> serge
>
>
>
>
>
>
>
S -
WIKI -
-
=C2- =C2- =C2- =C2- =C2- -Matt Dralle, List Admin.
Message 8
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| Subject: | Re: Generator failure/ loss of electrical power |
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Message 9
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| Subject: | Re: Generator failure/ loss of electrical power |
5 years is pushing the life expectancy of any battery. You may just
want to bite the bullet and replacethem and then see if the problem
still exists.
The M14 maintenancemanual clearly states the output voltage should be
adjusted via the rheostatto to 28 - 28.5 volts. But you do what you
want. You don't have to believe me. Look it up yourself.
Let me ask you this question. If it were a 12 volt battery in your car,
would you want the alternator output to run at say 12.8 volts torecharge
the battery that should read 12.6-13 volts or would you want that
alternator putting out 13-14 volts? How long do you think it will take
to recharge your 24 volt batteries under load to recharge at 25 volts?
Dennis
A. Dennis Savarese
334-546-8182 (mobile)
www.yak-52.com
Skype - Yakguy1
On 5/12/2017 9:01 PM, Cerveira Pinto wrote:
> Hi Dennis I have my 2x 12V gel batteries for 5 years no problem so
> far. My opinion is that 28.5V will degrade gel batteries to soon.
> Regards
>
>
> Enviado a partir do meu smartphone Samsung Galaxy.
>
> -------- Mensagem original --------
> De: "A. Dennis Savarese" <dsavarese0812@bellsouth.net>
> Data: 12/05/17 21:05 (GMT-03:00)
> Para: yak-list@matronics.com
> Assunto: Re: Yak-List: Generator failure/ loss of electrical power
>
> <dsavarese0812@bellsouth.net>
>
> 25-26 Volts is too low if you want to charge the battery. Should be set
> to 28.5 volts
> Dennis
>
> A. Dennis Savarese
> 334-546-8182 (mobile)
> www.yak-52.com
> Skype - Yakguy1
>
> On 5/12/2017 3:41 PM, Pedro Cerveira Pinto wrote:
> > Hi Serge
> > Have you checked the regulator voltage?
> > Check and register voltage and negative/positive amperes(meaning
> > battery is charging) at diferent settings
> > Adjust regulator voltage with a srew driver to obtain 25-26 volts
> >
> > Also check batteries condition
> >
> > Cheers
> >
> > 2017-05-12 18:16 GMT+01:00 Serge Svoysky <ssvoysky@gmail.com
> > <mailto:ssvoysky@gmail.com>>:
> >
> > <mailto:ssvoysky@gmail.com>>
> >
> > Hello all,
> > Looking for advice on the following situation- everything looked
> > normal on the ground; "generator failure" on idle, but went away
> > with RPM increase, proceeded to take off and got "generator
> > failure" right away on departure. Landed to check on the ground
> > again, all looked normal, departed, light came on. Decided to go
> > for a short flight, started losing all electrical equipment one by
> > one starting with the radio, but got it all back on final approach
> > when power was reduced. Worked fine (no light, charge as usual) on
> > the ground.
> >
> > I'd appreciate for any help!
> > YAK52 in NJ
> >
> > Thanks,
> > serge
> > ===================================
> > List" rel="noreferrer"
> > target="_blank">http://www.matronics.com/Navigator?Yak-List
> > ===================================
> > FORUMS -
> > eferrer" target="_blank">http://forums.matronics.com
> > ===================================
> > WIKI -
> > errer" target="_blank">http://wiki.matronics.com
> > ===================================
> > b Site -
> > -Matt Dralle, List Admin.
> > rel="noreferrer"
> target="_blank">http://www.matronics.com/contribution
> > ===================================
> >
> >
> >
> >
> >
> >
> > --
> > Pedro Cerveira Pinto
> >
>
>
Message 10
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| Subject: | Yak 55M Throttle Cable |
Has anyone ever had to replace a throttle cable on the Yak 55M? I have bee
n having an erratic throttle lever to power setting issue (lever position n
ot matching power output). Suspecting the throttle cable is the issue. Any
one ever encounter this?
Thank you
Jason
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