Today's Message Index:
----------------------
1. 04:08 AM - Re: Engine Out! (Mark Bitterlich)
2. 05:56 AM - Re: Engine Out! (Richard Hess)
3. 06:58 AM - Re: Engine Out! (A. Dennis Savarese)
4. 07:05 AM - Re: Engine Out! (Zeman)
5. 07:15 AM - Re: Engine Out! (Stephen van Dijck)
6. 09:27 AM - Re: Engine Out! (A. Dennis Savarese)
7. 01:38 PM - Re: Engine Out! (jlpartington@reagan.com)
8. 01:51 PM - Re: Engine Out! (Mark Bitterlich)
Message 1
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Message 2
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I had a mag go out on a Yak-52 once. The engine stumbled 100-200 RPM on a r
egular basis every so many seconds. Flying 2000 ft AGL I think it would hav
e scared the bejesus out of me to have the engine quit. I waited until on t
he ground then did a mag check. The engine died VERY rapidly when I selecte
d the dead mag.
Richard HessCell 404-964-4885
-----Original Message-----
From: Mark Bitterlich <markbitterlich@embarqmail.com>
Sent: Tue, Aug 24, 2021 7:08 am
Subject: Re: Yak-List: Engine Out!
It dawns on me that possibly every once in awhile we should all do a mag ch
eck in flight on a hot engine, and fly at normal power settings (not full t
hrottle, but at say "cruise power") on each mag one at a time for a full mi
nute or so to bring to light any "hot coil" malfunctions.=C2-
I know that I sure haven't done that since... well ever. Just might start u
nless someone offers a good reason why not to.=C2-
Mark
-------- Original message --------From: Mark Pennington <pennington.constru
ction.inc.1@gmail.com> Date: 8/23/21 9:02 PM (GMT-05:00) To: yak-list@matro
nics.com Subject: Re: Yak-List: Engine Out!
Thank you sir.=C2-
On Mon, Aug 23, 2021 at 8:49 PM Mark Bitterlich <markbitterlich@embarqmail.
com> wrote:
I would say highly unlikely.=C2- But ... it is possible for one mag to ma
sk an intermittent second mag, then the primary mag goes tango uniform and
the problems with the second mag show up. Convoluted huh?=C2- I concur. N
evertheless, 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.=C2
-=C2-
Mark
-------- Original message --------From: Mark Pennington <pennington.constru
ction.inc.1@gmail.com> Date: 8/23/21 7:36 PM (GMT-05:00) To: yak-list@matro
nics.com Subject: Re: Yak-List: Engine Out!
Mark.=C2-
Based on =C2-your comment.=C2- How likely is to have both mags crap out
on the same flight.=C2- If you stay off of both after determining a mag
is bad. ? =C2- =C2-
Interesting perception of his information
MarkN621CJ.=C2-
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 wen
t back to BOTH. That is a mistake.=C2- If you verify a mag as bad, turn i
t completely off by going to 2.=C2-
A bad mag can kill the motor, weird but true. Happened to me.=C2- Exactly
the same way.=C2-=C2-
Switching to 2 only, engine ran close to perfect.=C2-=C2-
If you went to 2 only and it STILL ran bad, see Dennis and Richard's explan
ation.=C2-
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: Eng
ine Out!
Cruising at 2500AGL all was well. Normal flight; I had already buzzed a fri
end=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 engin
e 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 de
cisions and turn toward the nearest airport while keeping as much altitude
as possible. Fuel and oil pressure are green; CHT is dropping. Another quic
k mag check demonstrates again, mag 1 is offline. VSI shows, I am losing al
titude. 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 wi
th 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 u
p, 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 or
dinary.=C2- No weird leaks. Fuel tanks were not under vacuum.=C2- Hard
at the moment to wrap my head around a failed mag (seemed like a digital fa
ilure) 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.=C2- Though
ts?
Message 3
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What's ironic is we automatically do a mag check on run up; L,R,B.=C2- B
ut the purpose of having 2 mags is in case one fails in flight.=C2- So wh
y not do a mag check in the air periodically.=C2- If you're uncomfortable
with doing that, then do it over your home field and do it fairly often un
til you don't have any apprehensions about doing it.Dennis =C2-=C2-
On Tuesday, August 24, 2021, 07:10:21 AM EDT, Mark Bitterlich <markbitt
erlich@embarqmail.com> wrote:
It dawns on me that possibly every once in awhile we should all do a mag c
heck in flight on a hot engine, and fly at normal power settings (not full
throttle, but at say "cruise power") on each mag one at a time for a full m
inute or so to bring to light any "hot coil" malfunctions.=C2-
I know that I sure haven't done that since... well ever. Just might start u
nless someone offers a good reason why not to.=C2-
Mark
-------- Original message --------From: Mark Pennington <pennington.constru
ction.inc.1@gmail.com> Date: 8/23/21 9:02 PM (GMT-05:00) To: yak-list@matro
nics.com Subject: Re: Yak-List: Engine Out!
Thank you sir.=C2-
On Mon, Aug 23, 2021 at 8:49 PM Mark Bitterlich <markbitterlich@embarqmail.
com> wrote:
I would say highly unlikely.=C2- But ... it is possible for one mag to ma
sk an intermittent second mag, then the primary mag goes tango uniform and
the problems with the second mag show up. Convoluted huh?=C2- I concur. N
evertheless, 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.=C2
-=C2-
Mark
-------- Original message --------From: Mark Pennington <pennington.constru
ction.inc.1@gmail.com> Date: 8/23/21 7:36 PM (GMT-05:00) To: yak-list@matro
nics.com Subject: Re: Yak-List: Engine Out!
Mark.=C2-
Based on =C2-your comment.=C2- How likely is to have both mags crap out
on the same flight.=C2- If you stay off of both after determining a mag
is bad. ? =C2- =C2-
Interesting perception of his information
MarkN621CJ.=C2-
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 wen
t back to BOTH. That is a mistake.=C2- If you verify a mag as bad, turn i
t completely off by going to 2.=C2-
A bad mag can kill the motor, weird but true. Happened to me.=C2- Exactly
the same way.=C2-=C2-
Switching to 2 only, engine ran close to perfect.=C2-=C2-
If you went to 2 only and it STILL ran bad, see Dennis and Richard's explan
ation.=C2-
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: Eng
ine Out!
Cruising at 2500AGL all was well. Normal flight; I had already buzzed a fri
end=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 engin
e 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 de
cisions and turn toward the nearest airport while keeping as much altitude
as possible. Fuel and oil pressure are green; CHT is dropping. Another quic
k mag check demonstrates again, mag 1 is offline. VSI shows, I am losing al
titude. 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 wi
th 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 u
p, 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 or
dinary.=C2- No weird leaks. Fuel tanks were not under vacuum.=C2- Hard
at the moment to wrap my head around a failed mag (seemed like a digital fa
ilure) 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.=C2- Though
ts?
Message 4
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Thanks guys. I realized the mistake of going back to 1+2 once on the
ground; noted and filed.
My plans are to attempt a start as the plane sits and do a run-up & mag
check if it starts - should happen today.
Either way, I will be pulling mag1 and replacing it with an NOS mag that I
have. I will also pull the cover on mag 2 for inspection. After that I
plan to test everything and fly around the airport for 30 minutes or so.
If that is without drama, I will land and let the plane sit for the night,
next morning fly back home to my hangar.
Then I will check the mags over and re-coil both.
Just a note, the caps have been off regularly, mags cleaned, gaps checked
and oiled. My run-ups have been perfect with 2% even drop on each mag.
Never had a miss or a hint of an issue. Like Mark mentioned - maybe a good
practice to mag check in flight. I do cycle the prop occasionally on
longer cruise flights, maybe time to add something to the list.
Message 5
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I don=99t know a lot about engines but you=99d probably want
to keep it short and at medium power settings and not too often.
regards Stephen
> On 24 Aug 2021, at 15:57, A. Dennis Savarese
<dsavarese0812@bellsouth.net> wrote:
>
> What's ironic is we automatically do a mag check on run up; L,R,B.
But the purpose of having 2 mags is in case one fails in flight. So why
not do a mag check in the air periodically. If you're uncomfortable
with doing that, then do it over your home field and do it fairly often
until you don't have any apprehensions about doing it.
> Dennis
>
> On Tuesday, August 24, 2021, 07:10:21 AM EDT, Mark Bitterlich
<markbitterlich@embarqmail.com> wrote:
>
>
> It dawns on me that possibly every once in awhile we should all do a
mag check in flight on a hot engine, and fly at normal power settings
(not full throttle, but at say "cruise power") on each mag one at a time
for a full minute or so to bring to light any "hot coil" malfunctions.
>
> I know that I sure haven't done that since... well ever. Just might
start unless someone offers a good reason why not to.
>
> Mark
>
>
> -------- Original message --------
> From: Mark Pennington <pennington.construction.inc.1@gmail.com>
> Date: 8/23/21 9:02 PM (GMT-05:00)
> To: yak-list@matronics.com
> Subject: Re: Yak-List: Engine Out!
>
> Thank you sir.
>
> On Mon, Aug 23, 2021 at 8:49 PM Mark Bitterlich
<markbitterlich@embarqmail.com <mailto: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 the 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
<mailto:pennington.construction.inc.1@gmail.com>>
> Date: 8/23/21 7:36 PM (GMT-05:00)
> To: yak-list@matronics.com <mailto: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 <mailto: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 <mailto:propwash@gmail.com>>
> Date: 8/23/21 9:40 AM (GMT-05:00)
> To: yak-list@matronics.com <mailto: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 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 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 6
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Why (probably want to keep it short and at medium power settings and not
too often)? The engine is suppose to be able to run just as well on one
mag as it is on both mags, with a slight RPM drop when running on one
mag only. Does anyone care to discuss why the engine RPM drops by a
small percentage when running on one mag only?
A. Dennis Savarese
334-546-8182
www.yak-52.com
On 8/24/2021 10:15 AM, Stephen van Dijck wrote:
> I dont know a lot about engines but youd probably want to keep it
> short and at medium power settings and not too often.
> regards Stephen
>
>
>> On 24 Aug 2021, at 15:57, A. Dennis Savarese
>> <dsavarese0812@bellsouth.net <mailto:dsavarese0812@bellsouth.net>> wrote:
>>
>> What's ironic is we automatically do a mag check on run up; L,R,B.
>> But the purpose of having 2 mags is in case one fails in flight. So
>> why not do a mag check in the air periodically. If you're
>> uncomfortable with doing that, then do it over your home field and do
>> it fairly often until you don't have any apprehensions about doing it.
>> Dennis
>>
>> On Tuesday, August 24, 2021, 07:10:21 AM EDT, Mark Bitterlich
>> <markbitterlich@embarqmail.com
>> <mailto:markbitterlich@embarqmail.com>> wrote:
>>
>>
>> It dawns on me that possibly every once in awhile we should all do a
>> mag check in flight on a hot engine, and fly at normal power settings
>> (not full throttle, but at say "cruise power") on each mag one at a
>> time for a full minute or so to bring to light any "hot coil"
>> malfunctions.
>>
>> I know that I sure haven't done that since... well ever. Just might
>> start unless someone offers a good reason why not to.
>>
>> Mark
>>
>>
>> -------- Original message --------
>> From: Mark Pennington <pennington.construction.inc.1@gmail.com
>> <mailto:pennington.construction.inc.1@gmail.com>>
>> Date: 8/23/21 9:02 PM (GMT-05:00)
>> To: yak-list@matronics.com <mailto:yak-list@matronics.com>
>> Subject: Re: Yak-List: Engine Out!
>>
>> Thank you sir.
>>
>> On Mon, Aug 23, 2021 at 8:49 PM Mark Bitterlich
>> <markbitterlich@embarqmail.com
>> <mailto: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 the 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
>> <mailto:pennington.construction.inc.1@gmail.com>>
>> Date: 8/23/21 7:36 PM (GMT-05:00)
>> To: yak-list@matronics.com <mailto: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
>> <mailto: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 <mailto:propwash@gmail.com>>
>> Date: 8/23/21 9:40 AM (GMT-05:00)
>> To: yak-list@matronics.com <mailto:yak-list@matronics.com>
>> Subject: Yak-List: Engine Out!
>>
>> 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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|
=0AI would=0A =0APartington=0A-----Original Message-----=0AFrom: "A. Dennis
Savarese" <dsavarese0812@bellsouth.net>=0ASent: Tuesday, 24 August, 2021 1
1:27am=0ATo: yak-list@matronics.com=0ASubject: Re: Yak-List: Engine Out!=0A
2@bellsouth.net>=0A=0AWhy (probably want to keep it short and at medium pow
er settings and not =0Atoo often)? The engine is suppose to be able to run
just as well on one =0Amag as it is on both mags, with a slight RPM drop w
hen running on one =0Amag only. Does anyone care to discuss why the engine
RPM drops by a =0Asmall percentage when running on one mag only?=0A=0AA. D
ennis Savarese=0A334-546-8182=0Awww.yak-52.com=0A=0AOn 8/24/2021 10:15 AM,
Stephen van Dijck wrote:=0A> I don=99t know a lot about engines but y
ou=99d probably want to keep it =0A> short and at medium power settin
gs and not too often.=0A> regards Stephen=0A>=0A>=0A>> On 24 Aug 2021, at 1
5:57, A. Dennis Savarese =0A>> <dsavarese0812@bellsouth.net <mailto:dsavare
se0812@bellsouth.net>> wrote:=0A>>=0A>> What's ironic is we automatically d
o a mag check on run up; L,R,B. =0A>> But the purpose of having 2 mags is
in case one fails in flight. So =0A>> why not do a mag check in the air pe
riodically. If you're =0A>> uncomfortable with doing that, then do it over
your home field and do =0A>> it fairly often until you don't have any appr
ehensions about doing it.=0A>> Dennis=0A>>=0A>> On Tuesday, August 24, 2021
, 07:10:21 AM EDT, Mark Bitterlich =0A>> <markbitterlich@embarqmail.com =0A
>> <mailto:markbitterlich@embarqmail.com>> wrote:=0A>>=0A>>=0A>> It dawns o
n me that possibly every once in awhile we should all do a =0A>> mag check
in flight on a hot engine, and fly at normal power settings =0A>> (not full
throttle, but at say "cruise power") on each mag one at a =0A>> time for a
full minute or so to bring to light any "hot coil" =0A>> malfunctions.=0A>
>=0A>> I know that I sure haven't done that since... well ever. Just might
=0A>> start unless someone offers a good reason why not to.=0A>>=0A>> Mark
=0A>>=0A>>=0A>> -------- Original message --------=0A>> From: Mark Penningt
on <pennington.construction.inc.1@gmail.com =0A>> <mailto:pennington.constr
uction.inc.1@gmail.com>>=0A>> Date: 8/23/21 9:02 PM (GMT-05:00)=0A>> To: ya
k-list@matronics.com <mailto:yak-list@matronics.com>=0A>> Subject: Re: Yak-
List: Engine Out!=0A>>=0A>> Thank you sir.=0A>>=0A>> On Mon, Aug 23, 2021 a
t 8:49 PM Mark Bitterlich =0A>> <markbitterlich@embarqmail.com =0A>> <mailt
o:markbitterlich@embarqmail.com>> wrote:=0A>>=0A>> I would say highly unlik
ely. But ... it is possible for one mag=0A>> to mask an intermittent secon
d mag, then the primary mag goes=0A>> tango uniform and the problems with t
he second mag show up.=0A>> Convoluted huh? I concur. Nevertheless, I stil
l offer that if=0A>> you determine one mag is BAD, do not go back to BOTH.
Switch to=0A>> the one mag still working and land immediately.=0A>>=0A>> Ma
rk=0A>>=0A>> -------- Original message --------=0A>> From: Mark Pennington
<pennington.construction.inc.1@gmail.com=0A>> <mailto:pennington.constructi
on.inc.1@gmail.com>>=0A>> Date: 8/23/21 7:36 PM (GMT-05:00)=0A>> To: yak-li
st@matronics.com <mailto:yak-list@matronics.com>=0A>> Subject: Re: Yak-List
: Engine Out!=0A>>=0A>> Mark.=0A>>=0A>> Based on your comment. How likely
is to have both mags crap out=0A>> on the same flight. If you stay off of
both after determining a=0A>> mag is bad. ?=0A>>=0A>> Interesting percepti
on of his information=0A>>=0A>> Mark=0A>> N621CJ.=0A>>=0A>>=0A>>=0A>> On Mo
n, Aug 23, 2021 at 6:03 PM Mark Bitterlich=0A>> <markbitterlich@embarqmail.
com=0A>> <mailto:markbitterlich@embarqmail.com>> wrote:=0A>>=0A>> If I unde
rstood the story, when mag 1 quit and you verified=0A>> it bad, you went ba
ck to BOTH. That is a mistake. If you=0A>> verify a mag as bad, turn it co
mpletely off by going to 2.=0A>>=0A>> A bad mag can kill the motor, weird b
ut true. Happened to=0A>> me. Exactly the same way.=0A>>=0A>> Switching to
2 only, engine ran close to perfect.=0A>>=0A>> If you went to 2 only and i
t STILL ran bad, see Dennis and=0A>> Richard's explanation.=0A>>=0A>> Mark
=0A>>=0A>>=0A>> -------- Original message --------=0A>> From: Zeman <propwa
sh@gmail.com <mailto:propwash@gmail.com>>=0A>> Date: 8/23/21 9:40 AM (GMT-0
5:00)=0A>> To: yak-list@matronics.com <mailto:yak-list@matronics.com>=0A>>
Subject: Yak-List: Engine Out!=0A>>=0A>> Cruising at 2500AGL all was well.
Normal flight; I had=0A>> already buzzed a friend=99s place and done
a few rolls. Running=0A>> great as always.=0A>>=0A>> Forty minutes in, I tu
rn towards home.=0A>>=0A>> Suddenly noticeable power loss accompanied with
missing. I=0A>> trim for level, scan the gauges to find nothing out of the
=0A>> green. A mag check and the engine quits on mag 1. Back to=0A>> both a
nd the engine is missing however I can hold altitude. I=0A>> am 12nm from h
ome base, 5nm from nearest airport.=0A>>=0A>> I am holding altitude and no
engine gauge is registering=0A>> anything odd. One mag is dead; I have anot
her. I turn for home.=0A>>=0A>> Then the engine starts noticeably missing m
ore. I break the=0A>> chain of bad decisions and turn toward the nearest ai
rport=0A>> while keeping as much altitude as possible. Fuel and oil=0A>> pr
essure are green; CHT is dropping. Another quick mag check=0A>> demonstrate
s again, mag 1 is offline. VSI shows, I am losing=0A>> altitude. Prop forwa
rd as well as throttle.=0A>>=0A>> I am already on frequency. One experiment
al in the pattern=0A>> doing touch and gos. I plan to do the pattern and co
me in=0A>> behind. I call three miles out with intention to land. Two=0A>>
miles out, the engine changes again.=0A>>=0A>> I broadcast asking for the e
xperimental=99s position - =9Cover=0A>> the numbers.=9D I
continue. I soon realize I cannot make the=0A>> pattern; I must try for a
downwind landing. I broadcast=0A>> asking for an expedite off the runway, s
tating =9CI have and=0A>> engine issue.=9D =9COff the run
way.=9D is the response. At 500AGL,=0A>> my engine quits. I line up,
looks OK. I lower the gear. Looks=0A>> a bit sketchy; I hold just above sta
ll. Over the numbers I=0A>> deploy the flaps and land. I roll down the runw
ay and manage=0A>> to coast onto the taxiway. I radio that I will need a to
w.=0A>>=0A>> Sitting in the cockpit, I call my friend asking what he is=0A>
> doing today...=0A>>=0A>> Plane is not bent. Visual flashlight inspection
notes nothing=0A>> out of the ordinary. No weird leaks. Fuel tanks were no
t=0A>> under vacuum. Hard at the moment to wrap my head around a=0A>> faile
d mag (seemed like a digital failure) and then the slow=0A>> decline (analo
g failure) thereafter.=0A>>=0A>> Data:=0A>> - Yak-52 that I have owned over
20 years.=0A>> - Never once had any type hiccup with the engine.=0A>> - St
ill had fuel & oil pressure after mag 1 out while missing=0A>> before engin
e quit.=0A>> - It was not shaking or rough, just missing and power loss.=0A
>>=0A>> I will have to troubleshoot, repair and fly back to my=0A>> hangar.
======0A=0A=0A=0A=0A=0A=0A=0A
Message 8
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