Today's Message Index:
----------------------
1. 06:36 AM - Engine Out! (Zeman)
2. 07:24 AM - Re: Engine Out! (Terry Calloway)
3. 08:01 AM - Re: Engine Out! (Richard Goode)
4. 08:42 AM - Re: Engine Out! (Richard Kelley)
5. 08:43 AM - Re: Engine Out! (Richard Kelley)
6. 09:25 AM - Re: Engine Out! (Anthony Savarese)
7. 09:29 AM - Re: Engine Out! (Anthony Savarese)
8. 02:58 PM - Re: Engine Out! (Mark Bitterlich)
9. 03:17 PM - Re: Engine Out! (Royden Heays)
10. 04:33 PM - Re: Engine Out! (Mark Pennington)
11. 05:45 PM - Re: Engine Out! (Mark Bitterlich)
12. 05:59 PM - Re: Engine Out! (Mark Pennington)
Message 1
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Cruising at 2500AGL all was well. Normal flight; I had already buzzed a
friend=99s place and done a few rolls. Running great as always.
Forty minutes in, I turn towards home.
Suddenly noticeable power loss accompanied with missing. I trim for level,
scan the gauges to find nothing out of the green. A mag check and the
engine quits on mag 1. Back to both and the engine is missing however I can
hold altitude. I am 12nm from home base, 5nm from nearest airport.
I am holding altitude and no engine gauge is registering anything odd. One
mag is dead; I have another. I turn for home.
Then the engine starts noticeably missing more. I break the chain of bad
decisions and turn toward the nearest airport while keeping as much
altitude as possible. Fuel and oil pressure are green; CHT is dropping.
Another quick mag check demonstrates again, mag 1 is offline. VSI shows, I
am losing altitude. Prop forward as well as throttle.
I am already on frequency. One experimental in the pattern doing touch and
gos. I plan to do the pattern and come in behind. I call three miles out
with intention to land. Two miles out, the engine changes again.
I broadcast asking for the experimental=99s position - =9Cover
the numbers.=9D I
continue. I soon realize I cannot make the pattern; I must try for a
downwind landing. I broadcast asking for an expedite off the runway,
stating =9CI have and engine issue.=9D =9COff the runway.
=9D is the response. At
500AGL, my engine quits. I line up, looks OK. I lower the gear. Looks a bit
sketchy; I hold just above stall. Over the numbers I deploy the flaps and
land. I roll down the runway and manage to coast onto the taxiway. I radio
that I will need a tow.
Sitting in the cockpit, I call my friend asking what he is doing today...
Plane is not bent. Visual flashlight inspection notes nothing out of the
ordinary. No weird leaks. Fuel tanks were not under vacuum. Hard at the
moment to wrap my head around a failed mag (seemed like a digital failure)
and then the slow decline (analog failure) thereafter.
Data:
- Yak-52 that I have owned over 20 years.
- Never once had any type hiccup with the engine.
- Still had fuel & oil pressure after mag 1 out while missing before engine
quit.
- It was not shaking or rough, just missing and power loss.
I will have to troubleshoot, repair and fly back to my hangar. Thoughts?
Message 2
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In 2010 I experienced what could have been a duplicate of your story on an M14.
We took the right mag cap off and it looked like there had been a fire. Everything
was black and burned.
Good luck.
> On Aug 23, 2021, at 8:42 AM, Zeman <propwash@gmail.com> wrote:
>
>
> Cruising at 2500AGL all was well. Normal flight; I had already buzzed a friends
place and done a few rolls. Running great as always.
>
> Forty minutes in, I turn towards home.
>
> Suddenly noticeable power loss accompanied with missing. I trim for level, scan
the gauges to find nothing out of the green. A mag check and the engine quits
on mag 1. Back to both and the engine is missing however I can hold altitude.
I am 12nm from home base, 5nm from nearest airport.
>
> I am holding altitude and no engine gauge is registering anything odd. One mag
is dead; I have another. I turn for home.
>
> Then the engine starts noticeably missing more. I break the chain of bad decisions
and turn toward the nearest airport while keeping as much altitude as possible.
Fuel and oil pressure are green; CHT is dropping. Another quick mag check
demonstrates again, mag 1 is offline. VSI shows, I am losing altitude. Prop
forward as well as throttle.
>
> I am already on frequency. One experimental in the pattern doing touch and gos.
I plan to do the pattern and come in behind. I call three miles out with intention
to land. Two miles out, the engine changes again.
>
> I broadcast asking for the experimentals position - over the numbers. I continue.
I soon realize I cannot make the pattern; I must try for a downwind landing.
I broadcast asking for an expedite off the runway, stating I have and engine
issue. Off the runway. is the response. At 500AGL, my engine quits. I line
up, looks OK. I lower the gear. Looks a bit sketchy; I hold just above stall.
Over the numbers I deploy the flaps and land. I roll down the runway and manage
to coast onto the taxiway. I radio that I will need a tow.
>
> Sitting in the cockpit, I call my friend asking what he is doing today...
>
> Plane is not bent. Visual flashlight inspection notes nothing out of the ordinary.
No weird leaks. Fuel tanks were not under vacuum. Hard at the moment to
wrap my head around a failed mag (seemed like a digital failure) and then the
slow decline (analog failure) thereafter.
>
> Data:
> - Yak-52 that I have owned over 20 years.
> - Never once had any type hiccup with the engine.
> - Still had fuel & oil pressure after mag 1 out while missing before engine quit.
> - It was not shaking or rough, just missing and power loss.
>
> I will have to troubleshoot, repair and fly back to my hangar. Thoughts?
Message 3
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It is of course difficult to troubleshoot at a distance, and since you
say that fuel pressure was okay, I would be extremely sure that this is
a magneto problem. As someone else has responded, look inside magneto to
see if there has been major and obvious problem or indeed, as we have
heard before ignition wires have somehow become burnt on the exhaust.
But I would put significant money on the problem being the magneto
coils. This is an issue that we have recognised for a number of years,
and what is curious is that a failure in one coil seems to lead to
random sparks into the cylinder which means that the engine will not
run, even at reduced power on the remaining magneto. We put a lot of
research into this, together with racing-car magneto specialists, and
came to the inclusion that the basic issue was that the coil is a copy
of the original Scintilla magneto in which the capacitor, a critical
part of the coil is placed inside the coil of hotwire. Inevitably, over
a period of time and heat, the capacitor will begin to fail.
Of course when the Russians were operating these engines, every engine,
whether it had been used or not was overhauled every six years and
during that process the coils were automatically changed. But today we
have many coils that are 20 years or even a lot more old, and quite
simply they will fail. The symptoms are an initial "stumble" and then
the engine resumes working smoothly. After a while, over several hours,
the stumbles will become more frequent and longer. Finally this leads to
the engine completely stopping, as in this case.
We have developed a totally new coil with very high technology
capacitor, from Panasonic, but mounted externally on the coil where it
still gets warm, but not exposed to the same degree of heat. We realised
in testing that these coils were a significant advance, so decided it
would be worth the effort to see if we could get them fully certificated
by EASA (European FAA), and after a lot of work and testing we actually
obtained full certification. But importantly, the process enabled us to
verify that the spark with these coils is 15% to 20% stronger than that
of a perfect original coil. We now have these coils flying on some 70
aircraft around the world; we have not had a single problem and many
owners have very specifically commented on easier starting; smoother
running; slightly more power, more economy et cetera.
I'm not sure if we are allowed to "advertise" on the Yaklist, but these
coils really do work and if anyone is interested please let us know!
RICHARD GOODE AEROBATICS
Rhodds Farm, Lyonshall, Hereford, HR5 3LW, UK
Tel: +44 (0)1544 340120 Fax: +44 (0)1544 340129
e-mail: <mailto:richard.goode@russianaeros.com>
richard.goode@russianaeros.com
<http://www.russianaeros.com> www.russianaeros.com
WORLD LEADERS IN RUSSIAN SPORTING AIRCRAFT & ENGINES
In partnership with Aerometal Kft, Hungary.
From: owner-yak-list-server@matronics.com
<owner-yak-list-server@matronics.com> On Behalf Of Zeman
Sent: 23 August 2021 14:32
Subject: Yak-List: Engine Out!
Cruising at 2500AGL all was well. Normal flight; I had already buzzed a
friend=99s place and done a few rolls. Running great as always.
Forty minutes in, I turn towards home.
Suddenly noticeable power loss accompanied with missing. I trim for
level, scan the gauges to find nothing out of the green. A mag check and
the engine quits on mag 1. Back to both and the engine is missing
however I can hold altitude. I am 12nm from home base, 5nm from nearest
airport.
I am holding altitude and no engine gauge is registering anything odd.
One mag is dead; I have another. I turn for home.
Then the engine starts noticeably missing more. I break the chain of bad
decisions and turn toward the nearest airport while keeping as much
altitude as possible. Fuel and oil pressure are green; CHT is dropping.
Another quick mag check demonstrates again, mag 1 is offline. VSI shows,
I am losing altitude. Prop forward as well as throttle.
I am already on frequency. One experimental in the pattern doing touch
and gos. I plan to do the pattern and come in behind. I call three miles
out with intention to land. Two miles out, the engine changes again.
I broadcast asking for the experimental=99s position -
=9Cover the numbers.=9D I continue. I soon realize I cannot
make the pattern; I must try for a downwind landing. I broadcast asking
for an expedite off the runway, stating =9CI have and engine
issue.=9D =9COff the runway.=9D is the response. At
500AGL, my engine quits. I line up, looks OK. I lower the gear. Looks a
bit sketchy; I hold just above stall. Over the numbers I deploy the
flaps and land. I roll down the runway and manage to coast onto the
taxiway. I radio that I will need a tow.
Sitting in the cockpit, I call my friend asking what he is doing
today...
Plane is not bent. Visual flashlight inspection notes nothing out of the
ordinary. No weird leaks. Fuel tanks were not under vacuum. Hard at
the moment to wrap my head around a failed mag (seemed like a digital
failure) and then the slow decline (analog failure) thereafter.
Data:
- Yak-52 that I have owned over 20 years.
- Never once had any type hiccup with the engine.
- Still had fuel & oil pressure after mag 1 out while missing before
engine quit.
- It was not shaking or rough, just missing and power loss.
I will have to troubleshoot, repair and fly back to my hangar.
Thoughts?
Message 4
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Fuel flop tube in the header tank
Sent from my iPhone
> On Aug 23, 2021, at 8:40 AM, Zeman <propwash@gmail.com> wrote:
>
>
> Cruising at 2500AGL all was well. Normal flight; I had already buzzed a friends
place and done a few rolls. Running great as always.
>
> Forty minutes in, I turn towards home.
>
> Suddenly noticeable power loss accompanied with missing. I trim for level, scan
the gauges to find nothing out of the green. A mag check and the engine quits
on mag 1. Back to both and the engine is missing however I can hold altitude.
I am 12nm from home base, 5nm from nearest airport.
>
> I am holding altitude and no engine gauge is registering anything odd. One mag
is dead; I have another. I turn for home.
>
> Then the engine starts noticeably missing more. I break the chain of bad decisions
and turn toward the nearest airport while keeping as much altitude as possible.
Fuel and oil pressure are green; CHT is dropping. Another quick mag check
demonstrates again, mag 1 is offline. VSI shows, I am losing altitude. Prop
forward as well as throttle.
>
> I am already on frequency. One experimental in the pattern doing touch and gos.
I plan to do the pattern and come in behind. I call three miles out with intention
to land. Two miles out, the engine changes again.
>
> I broadcast asking for the experimentals position - over the numbers. I continue.
I soon realize I cannot make the pattern; I must try for a downwind landing.
I broadcast asking for an expedite off the runway, stating I have and engine
issue. Off the runway. is the response. At 500AGL, my engine quits. I line
up, looks OK. I lower the gear. Looks a bit sketchy; I hold just above stall.
Over the numbers I deploy the flaps and land. I roll down the runway and manage
to coast onto the taxiway. I radio that I will need a tow.
>
> Sitting in the cockpit, I call my friend asking what he is doing today...
>
> Plane is not bent. Visual flashlight inspection notes nothing out of the ordinary.
No weird leaks. Fuel tanks were not under vacuum. Hard at the moment to
wrap my head around a failed mag (seemed like a digital failure) and then the
slow decline (analog failure) thereafter.
>
> Data:
> - Yak-52 that I have owned over 20 years.
> - Never once had any type hiccup with the engine.
> - Still had fuel & oil pressure after mag 1 out while missing before engine quit.
> - It was not shaking or rough, just missing and power loss.
>
> I will have to troubleshoot, repair and fly back to my hangar. Thoughts?
Message 5
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Sheer coupler in one of the mags
Sent from my iPhone
> On Aug 23, 2021, at 10:42 AM, Richard Kelley <rickkelleyfly@gmail.com> wrote:
>
> Fuel flop tube in the header tank
>
> Sent from my iPhone
>
>> On Aug 23, 2021, at 8:40 AM, Zeman <propwash@gmail.com> wrote:
>>
>>
>> Cruising at 2500AGL all was well. Normal flight; I had already buzzed a friends
place and done a few rolls. Running great as always.
>>
>> Forty minutes in, I turn towards home.
>>
>> Suddenly noticeable power loss accompanied with missing. I trim for level, scan
the gauges to find nothing out of the green. A mag check and the engine quits
on mag 1. Back to both and the engine is missing however I can hold altitude.
I am 12nm from home base, 5nm from nearest airport.
>>
>> I am holding altitude and no engine gauge is registering anything odd. One mag
is dead; I have another. I turn for home.
>>
>> Then the engine starts noticeably missing more. I break the chain of bad decisions
and turn toward the nearest airport while keeping as much altitude as possible.
Fuel and oil pressure are green; CHT is dropping. Another quick mag check
demonstrates again, mag 1 is offline. VSI shows, I am losing altitude. Prop
forward as well as throttle.
>>
>> I am already on frequency. One experimental in the pattern doing touch and gos.
I plan to do the pattern and come in behind. I call three miles out with intention
to land. Two miles out, the engine changes again.
>>
>> I broadcast asking for the experimentals position - over the numbers. I continue.
I soon realize I cannot make the pattern; I must try for a downwind landing.
I broadcast asking for an expedite off the runway, stating I have and engine
issue. Off the runway. is the response. At 500AGL, my engine quits. I line
up, looks OK. I lower the gear. Looks a bit sketchy; I hold just above stall.
Over the numbers I deploy the flaps and land. I roll down the runway and manage
to coast onto the taxiway. I radio that I will need a tow.
>>
>> Sitting in the cockpit, I call my friend asking what he is doing today...
>>
>> Plane is not bent. Visual flashlight inspection notes nothing out of the ordinary.
No weird leaks. Fuel tanks were not under vacuum. Hard at the moment
to wrap my head around a failed mag (seemed like a digital failure) and then the
slow decline (analog failure) thereafter.
>>
>> Data:
>> - Yak-52 that I have owned over 20 years.
>> - Never once had any type hiccup with the engine.
>> - Still had fuel & oil pressure after mag 1 out while missing before engine
quit.
>> - It was not shaking or rough, just missing and power loss.
>>
>> I will have to troubleshoot, repair and fly back to my hangar. Thoughts?
Message 6
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Pull the dead mag cover and check the point gap. I have seen the foot on the point
worn to the point that the points would not open. Why did the foot wear!
Because the felt oil wick that rubs on the cam lobe had not been refreshed with
a light weight oil periodically. If the point gap is in spec, go to the next
suggestion.
Next, check the high voltage stick to see if there is any evidence of arcing around
the area where it slips into the phenolic socket. Usually if there is arcing
youll see the black carbon tracks on the metal surface near the stick. Pull
it out of the mag and carefully examine it for cracks and arcing. If it has
the waxy coating, just replace it anyway.
Lastly, if both of the above are normal, then most likely the coil is TU. Order
a new one from Richard Goode.
Dennis.
Sent from my iPhone
> On Aug 23, 2021, at 11:45 AM, Richard Kelley <rickkelleyfly@gmail.com> wrote:
>
>
> Sheer coupler in one of the mags
>
> Sent from my iPhone
>
>> On Aug 23, 2021, at 10:42 AM, Richard Kelley <rickkelleyfly@gmail.com> wrote:
>>
>> Fuel flop tube in the header tank
>>
>> Sent from my iPhone
>>
>>>> On Aug 23, 2021, at 8:40 AM, Zeman <propwash@gmail.com> wrote:
>>>
>>>
>>> Cruising at 2500AGL all was well. Normal flight; I had already buzzed a friends
place and done a few rolls. Running great as always.
>>>
>>> Forty minutes in, I turn towards home.
>>>
>>> Suddenly noticeable power loss accompanied with missing. I trim for level,
scan the gauges to find nothing out of the green. A mag check and the engine quits
on mag 1. Back to both and the engine is missing however I can hold altitude.
I am 12nm from home base, 5nm from nearest airport.
>>>
>>> I am holding altitude and no engine gauge is registering anything odd. One
mag is dead; I have another. I turn for home.
>>>
>>> Then the engine starts noticeably missing more. I break the chain of bad decisions
and turn toward the nearest airport while keeping as much altitude as
possible. Fuel and oil pressure are green; CHT is dropping. Another quick mag
check demonstrates again, mag 1 is offline. VSI shows, I am losing altitude. Prop
forward as well as throttle.
>>>
>>> I am already on frequency. One experimental in the pattern doing touch and
gos. I plan to do the pattern and come in behind. I call three miles out with
intention to land. Two miles out, the engine changes again.
>>>
>>> I broadcast asking for the experimentals position - over the numbers. I continue.
I soon realize I cannot make the pattern; I must try for a downwind landing.
I broadcast asking for an expedite off the runway, stating I have and engine
issue. Off the runway. is the response. At 500AGL, my engine quits. I line
up, looks OK. I lower the gear. Looks a bit sketchy; I hold just above stall.
Over the numbers I deploy the flaps and land. I roll down the runway and manage
to coast onto the taxiway. I radio that I will need a tow.
>>>
>>> Sitting in the cockpit, I call my friend asking what he is doing today...
>>>
>>> Plane is not bent. Visual flashlight inspection notes nothing out of the ordinary.
No weird leaks. Fuel tanks were not under vacuum. Hard at the moment
to wrap my head around a failed mag (seemed like a digital failure) and then
the slow decline (analog failure) thereafter.
>>>
>>> Data:
>>> - Yak-52 that I have owned over 20 years.
>>> - Never once had any type hiccup with the engine.
>>> - Still had fuel & oil pressure after mag 1 out while missing before engine
quit.
>>> - It was not shaking or rough, just missing and power loss.
>>>
>>> I will have to troubleshoot, repair and fly back to my hangar. Thoughts?
>
>
>
>
Message 7
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What sheer coupler? You mean the rubber coupling on the magneto drive?
Dennis
Sent from my iPhone
> On Aug 23, 2021, at 12:24 PM, Anthony Savarese <dsavarese0812@bellsouth.net>
wrote:
>
> Pull the dead mag cover and check the point gap. I have seen the foot on the
point worn to the point that the points would not open. Why did the foot wear!
Because the felt oil wick that rubs on the cam lobe had not been refreshed with
a light weight oil periodically. If the point gap is in spec, go to the next
suggestion.
>
> Next, check the high voltage stick to see if there is any evidence of arcing
around the area where it slips into the phenolic socket. Usually if there is arcing
youll see the black carbon tracks on the metal surface near the stick. Pull
it out of the mag and carefully examine it for cracks and arcing. If it
has the waxy coating, just replace it anyway.
>
> Lastly, if both of the above are normal, then most likely the coil is TU. Order
a new one from Richard Goode.
> Dennis.
>
>
> Sent from my iPhone
>
>> On Aug 23, 2021, at 11:45 AM, Richard Kelley <rickkelleyfly@gmail.com> wrote:
>>
>>
>> Sheer coupler in one of the mags
>>
>> Sent from my iPhone
>>
>>>> On Aug 23, 2021, at 10:42 AM, Richard Kelley <rickkelleyfly@gmail.com> wrote:
>>>
>>> Fuel flop tube in the header tank
>>>
>>> Sent from my iPhone
>>>
>>>>> On Aug 23, 2021, at 8:40 AM, Zeman <propwash@gmail.com> wrote:
>>>>
>>>>
>>>> Cruising at 2500AGL all was well. Normal flight; I had already buzzed a friends
place and done a few rolls. Running great as always.
>>>>
>>>> Forty minutes in, I turn towards home.
>>>>
>>>> Suddenly noticeable power loss accompanied with missing. I trim for level,
scan the gauges to find nothing out of the green. A mag check and the engine
quits on mag 1. Back to both and the engine is missing however I can hold altitude.
I am 12nm from home base, 5nm from nearest airport.
>>>>
>>>> I am holding altitude and no engine gauge is registering anything odd. One
mag is dead; I have another. I turn for home.
>>>>
>>>> Then the engine starts noticeably missing more. I break the chain of bad decisions
and turn toward the nearest airport while keeping as much altitude as
possible. Fuel and oil pressure are green; CHT is dropping. Another quick mag
check demonstrates again, mag 1 is offline. VSI shows, I am losing altitude.
Prop forward as well as throttle.
>>>>
>>>> I am already on frequency. One experimental in the pattern doing touch and
gos. I plan to do the pattern and come in behind. I call three miles out with
intention to land. Two miles out, the engine changes again.
>>>>
>>>> I broadcast asking for the experimentals position - over the numbers. I continue.
I soon realize I cannot make the pattern; I must try for a downwind landing.
I broadcast asking for an expedite off the runway, stating I have and engine
issue. Off the runway. is the response. At 500AGL, my engine quits. I line
up, looks OK. I lower the gear. Looks a bit sketchy; I hold just above stall.
Over the numbers I deploy the flaps and land. I roll down the runway and manage
to coast onto the taxiway. I radio that I will need a tow.
>>>>
>>>> Sitting in the cockpit, I call my friend asking what he is doing today...
>>>>
>>>> Plane is not bent. Visual flashlight inspection notes nothing out of the ordinary.
No weird leaks. Fuel tanks were not under vacuum. Hard at the moment
to wrap my head around a failed mag (seemed like a digital failure) and then
the slow decline (analog failure) thereafter.
>>>>
>>>> Data:
>>>> - Yak-52 that I have owned over 20 years.
>>>> - Never once had any type hiccup with the engine.
>>>> - Still had fuel & oil pressure after mag 1 out while missing before engine
quit.
>>>> - It was not shaking or rough, just missing and power loss.
>>>>
>>>> I will have to troubleshoot, repair and fly back to my hangar. Thoughts?
>>
>>
>>
>>
Message 8
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Message 9
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I have a Yak 55M with the 360 HP M14P.
I have had similar experiences.
On one flight One mag went dead in flight. The culprit was a screw that
worked loose under the Mag cap which was being thrown around inside by the
rotor. So I would suggest you remove the cap and inspect the mag
rotor/points area for starters.
On other flights I have had intermittent missing in flight on both mags -
extent of missing variable from mild to seriously disconcerting . This
occured after 1 hr to 1 1/2hrs of flight time. It was very difficult to
find the cause. On restart and runup the symptoms were gone. The Yak list
has had many such reports posted over the years. The problem most of the
time is the magneto coils breaking down with age in Richard Goodes
view/experience. In my case I replaced the coil in each mag with rebuilds
from Richard and have not experienced such problems since. Jill at M14P
also does coil rebuilds. It is a relatively easy remove and instal job to
do. Best to remove the mags from the engine.
In the process of elimination, I'm suggesting replacing the coils is the
first step to take. An obvious question is how old are your mags?
Hope this helps.
On Mon, Aug 23, 2021 at 6:48 AM Zeman <propwash@gmail.com> wrote:
> Cruising at 2500AGL all was well. Normal flight; I had already buzzed a
> friend=99s place and done a few rolls. Running great as always.
>
> Forty minutes in, I turn towards home.
>
> Suddenly noticeable power loss accompanied with missing. I trim for level
,
> scan the gauges to find nothing out of the green. A mag check and the
> engine quits on mag 1. Back to both and the engine is missing however I c
an
> hold altitude. I am 12nm from home base, 5nm from nearest airport.
>
> I am holding altitude and no engine gauge is registering anything odd. On
e
> mag is dead; I have another. I turn for home.
>
> Then the engine starts noticeably missing more. I break the chain of bad
> decisions and turn toward the nearest airport while keeping as much
> altitude as possible. Fuel and oil pressure are green; CHT is dropping.
> Another quick mag check demonstrates again, mag 1 is offline. VSI shows,
I
> am losing altitude. Prop forward as well as throttle.
>
> I am already on frequency. One experimental in the pattern doing touch an
d
> gos. I plan to do the pattern and come in behind. I call three miles out
> with intention to land. Two miles out, the engine changes again.
>
> I broadcast asking for the experimental=99s position - =9Cove
r the numbers.=9D I
> continue. I soon realize I cannot make the pattern; I must try for a
> downwind landing. I broadcast asking for an expedite off the runway,
> stating =9CI have and engine issue.=9D =9COff the runwa
y.=9D is the response. At
> 500AGL, my engine quits. I line up, looks OK. I lower the gear. Looks a b
it
> sketchy; I hold just above stall. Over the numbers I deploy the flaps and
> land. I roll down the runway and manage to coast onto the taxiway. I radi
o
> that I will need a tow.
>
> Sitting in the cockpit, I call my friend asking what he is doing today...
>
> Plane is not bent. Visual flashlight inspection notes nothing out of the
> ordinary. No weird leaks. Fuel tanks were not under vacuum. Hard at the
> moment to wrap my head around a failed mag (seemed like a digital failure
)
> and then the slow decline (analog failure) thereafter.
>
> Data:
> - Yak-52 that I have owned over 20 years.
> - Never once had any type hiccup with the engine.
> - Still had fuel & oil pressure after mag 1 out while missing before
> engine quit.
> - It was not shaking or rough, just missing and power loss.
>
> I will have to troubleshoot, repair and fly back to my hangar. Thoughts?
>
Message 10
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Mark.
Based on your comment. How likely is to have both mags crap out on the
same flight. If you stay off of both after determining a mag is bad. ?
Interesting perception of his information
Mark
N621CJ.
On Mon, Aug 23, 2021 at 6:03 PM Mark Bitterlich <
markbitterlich@embarqmail.com> wrote:
> If I understood the story, when mag 1 quit and you verified it bad, you
> went back to BOTH. That is a mistake. If you verify a mag as bad, turn i
t
> completely off by going to 2.
>
> A bad mag can kill the motor, weird but true. Happened to me. Exactly th
e
> same way.
>
> Switching to 2 only, engine ran close to perfect.
>
> If you went to 2 only and it STILL ran bad, see Dennis and Richard's
> explanation.
>
> Mark
>
>
> -------- Original message --------
> From: Zeman <propwash@gmail.com>
> Date: 8/23/21 9:40 AM (GMT-05:00)
> To: yak-list@matronics.com
> Subject: Yak-List: Engine Out!
>
> Cruising at 2500AGL all was well. Normal flight; I had already buzzed a
> friend=99s place and done a few rolls. Running great as always.
>
> Forty minutes in, I turn towards home.
>
> Suddenly noticeable power loss accompanied with missing. I trim for level
,
> scan the gauges to find nothing out of the green. A mag check and the
> engine quits on mag 1. Back to both and the engine is missing however I c
an
> hold altitude. I am 12nm from home base, 5nm from nearest airport.
>
> I am holding altitude and no engine gauge is registering anything odd. On
e
> mag is dead; I have another. I turn for home.
>
> Then the engine starts noticeably missing more. I break the chain of bad
> decisions and turn toward the nearest airport while keeping as much
> altitude as possible. Fuel and oil pressure are green; CHT is dropping.
> Another quick mag check demonstrates again, mag 1 is offline. VSI shows,
I
> am losing altitude. Prop forward as well as throttle.
>
> I am already on frequency. One experimental in the pattern doing touch an
d
> gos. I plan to do the pattern and come in behind. I call three miles out
> with intention to land. Two miles out, the engine changes again.
>
> I broadcast asking for the experimental=99s position - =9Cove
r the numbers.=9D I
> continue. I soon realize I cannot make the pattern; I must try for a
> downwind landing. I broadcast asking for an expedite off the runway,
> stating =9CI have and engine issue.=9D =9COff the runwa
y.=9D is the response. At
> 500AGL, my engine quits. I line up, looks OK. I lower the gear. Looks a b
it
> sketchy; I hold just above stall. Over the numbers I deploy the flaps and
> land. I roll down the runway and manage to coast onto the taxiway. I radi
o
> that I will need a tow.
>
> Sitting in the cockpit, I call my friend asking what he is doing today...
>
> Plane is not bent. Visual flashlight inspection notes nothing out of the
> ordinary. No weird leaks. Fuel tanks were not under vacuum. Hard at the
> moment to wrap my head around a failed mag (seemed like a digital failure
)
> and then the slow decline (analog failure) thereafter.
>
> Data:
> - Yak-52 that I have owned over 20 years.
> - Never once had any type hiccup with the engine.
> - Still had fuel & oil pressure after mag 1 out while missing before
> engine quit.
> - It was not shaking or rough, just missing and power loss.
>
> I will have to troubleshoot, repair and fly back to my hangar. Thoughts?
>
Message 11
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Message 12
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Thank you sir.
On Mon, Aug 23, 2021 at 8:49 PM Mark Bitterlich <
markbitterlich@embarqmail.com> wrote:
> I would say highly unlikely. But ... it is possible for one mag to mask
> an intermittent second mag, then the primary mag goes tango uniform and t
he
> problems with the second mag show up. Convoluted huh? I concur.
> Nevertheless, I still offer that if you determine one mag is BAD, do not
go
> back to BOTH. Switch to the one mag still working and land immediately.
>
> Mark
>
> -------- Original message --------
> From: Mark Pennington <pennington.construction.inc.1@gmail.com>
> Date: 8/23/21 7:36 PM (GMT-05:00)
> To: yak-list@matronics.com
> Subject: Re: Yak-List: Engine Out!
>
> Mark.
>
> Based on your comment. How likely is to have both mags crap out on the
> same flight. If you stay off of both after determining a mag is bad. ?
>
> Interesting perception of his information
>
> Mark
> N621CJ.
>
>
> On Mon, Aug 23, 2021 at 6:03 PM Mark Bitterlich <
> markbitterlich@embarqmail.com> wrote:
>
>> If I understood the story, when mag 1 quit and you verified it bad, you
>> went back to BOTH. That is a mistake. If you verify a mag as bad, turn
it
>> completely off by going to 2.
>>
>> A bad mag can kill the motor, weird but true. Happened to me. Exactly
>> the same way.
>>
>> Switching to 2 only, engine ran close to perfect.
>>
>> If you went to 2 only and it STILL ran bad, see Dennis and Richard's
>> explanation.
>>
>> Mark
>>
>>
>> -------- Original message --------
>> From: Zeman <propwash@gmail.com>
>> Date: 8/23/21 9:40 AM (GMT-05:00)
>> To: yak-list@matronics.com
>> Subject: Yak-List: Engine Out!
>>
>> Cruising at 2500AGL all was well. Normal flight; I had already buzzed a
>> friend=99s place and done a few rolls. Running great as always.
>>
>> Forty minutes in, I turn towards home.
>>
>> Suddenly noticeable power loss accompanied with missing. I trim for
>> level, scan the gauges to find nothing out of the green. A mag check and
>> the engine quits on mag 1. Back to both and the engine is missing howeve
r I
>> can hold altitude. I am 12nm from home base, 5nm from nearest airport.
>>
>> I am holding altitude and no engine gauge is registering anything odd.
>> One mag is dead; I have another. I turn for home.
>>
>> Then the engine starts noticeably missing more. I break the chain of bad
>> decisions and turn toward the nearest airport while keeping as much
>> altitude as possible. Fuel and oil pressure are green; CHT is dropping.
>> Another quick mag check demonstrates again, mag 1 is offline. VSI shows,
I
>> am losing altitude. Prop forward as well as throttle.
>>
>> I am already on frequency. One experimental in the pattern doing touch
>> and gos. I plan to do the pattern and come in behind. I call three miles
>> out with intention to land. Two miles out, the engine changes again.
>>
>> I broadcast asking for the experimental=99s position - =9Cov
er the numbers.=9D
>> I continue. I soon realize I cannot make the pattern; I must try for a
>> downwind landing. I broadcast asking for an expedite off the runway,
>> stating =9CI have and engine issue.=9D =9COff the runw
ay.=9D is the response. At
>> 500AGL, my engine quits. I line up, looks OK. I lower the gear. Looks a
bit
>> sketchy; I hold just above stall. Over the numbers I deploy the flaps an
d
>> land. I roll down the runway and manage to coast onto the taxiway. I rad
io
>> that I will need a tow.
>>
>> Sitting in the cockpit, I call my friend asking what he is doing today..
.
>>
>> Plane is not bent. Visual flashlight inspection notes nothing out of the
>> ordinary. No weird leaks. Fuel tanks were not under vacuum. Hard at th
e
>> moment to wrap my head around a failed mag (seemed like a digital failur
e)
>> and then the slow decline (analog failure) thereafter.
>>
>> Data:
>> - Yak-52 that I have owned over 20 years.
>> - Never once had any type hiccup with the engine.
>> - Still had fuel & oil pressure after mag 1 out while missing before
>> engine quit.
>> - It was not shaking or rough, just missing and power loss.
>>
>> I will have to troubleshoot, repair and fly back to my hangar. Thoughts
?
>>
>
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