Today's Message Index:
----------------------
1. 01:04 PM - troubleshooting help needed (Bill Hibbing)
2. 01:10 PM - Re: troubleshooting help needed (Bill Bradburry)
3. 04:57 PM - Fw: Fw: Fw: FW: True Patriotism --- (David)
4. 06:00 PM - Re: troubleshooting help needed (Robert L. Nuckolls, III)
5. 06:34 PM - Re: troubleshooting help needed (Jeff Luckey)
6. 07:27 PM - Aircraft Part Fell From Sky (Scott R. Shook)
Message 1
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| Subject: | troubleshooting help needed |
Here's the problem that has me scratching my head. I have a Glasair
Super 2 that's been flying with no problems for over 100 hours. The
electric system is Z 11, 14 volt. The engine is a Lycoming IO360 and
the alternator is the one that came with the engine and of Chrysler
origin for aircraft use. I'm told that they are fairly bulletproof. It
was completely overhauled before I started flying. The voltage
regulator is a B & C LR3C.
So here's the problem which has popped up in the last 15 hours or so.
When I'm flying at cruise power, or even idling, the voltage wanders up
and down from 14.4v to slightly less than 13v. It does go down enough
that my Garmin Aera 796 will drop off of ships power and go to it's
internal battery. This would indicate to me that this is not a problem
with the voltmeter. This does not seem to have any measurable cycle.
The amps stay constant at about 16 amps. When I've had the plane flying
I've tried turning off equipment one at a time to see if that might have
any effect...it didn't.
I've checked my connections for any corrosion and everything looks good
and tight, including the alternator belt. The next thing I'm going to
do is run the B&C troubleshooting checklist but I thought I would put
this out for the list to see if anyone has any ideas that I haven't
thought of that I might check. I personally suspect the LR3C but the
folks at B&C have their doubts. So what y'all think?
Bill
Glasair SIIS-FT
Message 2
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| Subject: | troubleshooting help needed |
Bill,
I am having a similar problem with my Lancair. The voltage seems to float
up and down about a half volt and I have had problems with the transponder
shutting down and the moving map resets. I hope my problem is your problem
and someone has a solution.
Bill B
_____
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Bill
Hibbing
Sent: Friday, July 20, 2012 4:02 PM
Subject: AeroElectric-List: troubleshooting help needed
Here's the problem that has me scratching my head. I have a Glasair Super 2
that's been flying with no problems for over 100 hours. The electric system
is Z 11, 14 volt. The engine is a Lycoming IO360 and the alternator is the
one that came with the engine and of Chrysler origin for aircraft use. I'm
told that they are fairly bulletproof. It was completely overhauled before
I started flying. The voltage regulator is a B & C LR3C.
So here's the problem which has popped up in the last 15 hours or so. When
I'm flying at cruise power, or even idling, the voltage wanders up and down
from 14.4v to slightly less than 13v. It does go down enough that my Garmin
Aera 796 will drop off of ships power and go to it's internal battery. This
would indicate to me that this is not a problem with the voltmeter. This
does not seem to have any measurable cycle. The amps stay constant at about
16 amps. When I've had the plane flying I've tried turning off equipment
one at a time to see if that might have any effect...it didn't.
I've checked my connections for any corrosion and everything looks good and
tight, including the alternator belt. The next thing I'm going to do is
run the B&C troubleshooting checklist but I thought I would put this out for
the list to see if anyone has any ideas that I haven't thought of that I
might check. I personally suspect the LR3C but the folks at B&C have their
doubts. So what y'all think?
Bill
Glasair SIIS-FT
Message 3
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| Subject: | Fwd: Fwd: Fw: FW: True Patriotism --- |
Message 4
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| Subject: | Re: troubleshooting help needed |
At 03:02 PM 7/20/2012, you wrote:
Here's the problem that has me scratching my head. I have a Glasair
Super 2 that's been flying with no problems for over 100 hours. The
electric system is Z 11, 14 volt. The engine is a Lycoming IO360 and
the alternator is the one that came with the engine and of Chrysler
origin for aircraft use. I'm told that they are fairly
bulletproof. It was completely overhauled before I started
flying. The voltage regulator is a B & C LR3C.
So here's the problem which has popped up in the last 15 hours or
so. When I'm flying at cruise power, or even idling, the voltage
wanders up and down from 14.4v to slightly less than 13v. It does go
down enough that my Garmin Aera 796 will drop off of ships power and
go to it's internal battery. This would indicate to me that this is
not a problem with the voltmeter. This does not seem to have any
measurable cycle. The amps stay constant at about 16 amps. When
I've had the plane flying I've tried turning off equipment one at a
time to see if that might have any effect...it didn't.
I've checked my connections for any corrosion and everything looks
good and tight, including the alternator belt. The next thing I'm
going to do is run the B&C troubleshooting checklist but I thought I
would put this out for the list to see if anyone has any ideas that I
haven't thought of that I might check. I personally suspect the LR3C
but the folks at B&C have their doubts. So what y'all think?
You need to bring three wires into the cockpit from
the regulator. One that is attached to the field output
terminal (4), another to ov-sense input (3) and a third
to ground (7).
Emacs!
You need to watch and record the voltage reading between
ground (7) and field (4) when the alternator is operating
normally at minimum system loads and maximum system loads.
Then move your test voltmeter to read voltage between ground
(7) and ov-sense (3). Repeat the min/max loads experiment
and compare the readings on the test voltmeter and any
panel displays for bus voltage.
Then when the alternator is mis-behaving under any normal
operating load, does the field voltage go UP as the
bus voltage indications on the panel go down . . . or
vice-versa? Also, during misbehavior notice if there
is any deviation from ov-sense readings you acquired
earlier and panel displayed voltage readings.
If the alternator is working properly, Field and Bus voltage
should go up and down together in response to output
from the regulator.
If they are out of sync . . . then the alternator is bad
(probably failing brushes). If they go up and down together,
then move your test meter.
If they do go up and down together, then turn your attention
to the difference between panel voltage display and test
meter. Are the differences markedly dissimilar from when the
alternator was working?
This exercise in data gathering allows one to deduce
whether the problem lies in the alternator, regulator
or ship's wiring.
Bob . . .
Message 5
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| Subject: | troubleshooting help needed |
See my question inserted about 3/4 way down the page.
-Jeff Luckey
_____
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Robert L.
Nuckolls, III
Sent: Friday, July 20, 2012 17:59
Subject: Re: AeroElectric-List: troubleshooting help needed
At 03:02 PM 7/20/2012, you wrote:
Here's the problem that has me scratching my head. I have a Glasair Super 2
that's been flying with no problems for over 100 hours. The electric system
is Z 11, 14 volt. The engine is a Lycoming IO360 and the alternator is the
one that came with the engine and of Chrysler origin for aircraft use. I'm
told that they are fairly bulletproof. It was completely overhauled before
I started flying. The voltage regulator is a B & C LR3C.
So here's the problem which has popped up in the last 15 hours or so. When
I'm flying at cruise power, or even idling, the voltage wanders up and down
from 14.4v to slightly less than 13v. It does go down enough that my Garmin
Aera 796 will drop off of ships power and go to it's internal battery. This
would indicate to me that this is not a problem with the voltmeter. This
does not seem to have any measurable cycle. The amps stay constant at about
16 amps. When I've had the plane flying I've tried turning off equipment
one at a time to see if that might have any effect...it didn't.
I've checked my connections for any corrosion and everything looks good and
tight, including the alternator belt. The next thing I'm going to do is
run the B&C troubleshooting checklist but I thought I would put this out for
the list to see if anyone has any ideas that I haven't thought of that I
might check. I personally suspect the LR3C but the folks at B&C have their
doubts. So what y'all think?
You need to bring three wires into the cockpit from
the regulator. One that is attached to the field output
terminal (4), another to ov-sense input (3) and a third
to ground (7).
Emacs!
You need to watch and record the voltage reading between
ground (7) and field (4) when the alternator is operating
normally at minimum system loads and maximum system loads.
Then move your test voltmeter to read voltage between ground
(7) and ov-sense (3). Repeat the min/max loads experiment
and compare the readings on the test voltmeter and any
panel displays for bus voltage.
Then when the alternator is mis-behaving under any normal
operating load, does the field voltage go UP as the
bus voltage indications on the panel go down . . . or
vice-versa? Also, during misbehavior notice if there
is any deviation from ov-sense readings you acquired
earlier and panel displayed voltage readings.
If the alternator is working properly, Field and Bus voltage
should go up and down together in response to output
from the regulator.
[Luckey]
Bob, is that correct - shouldn't Field & Bus voltage oppose each other?
i.e. as Bus voltage goes up, Field current should go down?
If they are out of sync . . . then the alternator is bad
(probably failing brushes). If they go up and down together,
then move your test meter.
If they do go up and down together, then turn your attention
to the difference between panel voltage display and test
meter. Are the differences markedly dissimilar from when the
alternator was working?
This exercise in data gathering allows one to deduce
whether the problem lies in the alternator, regulator
or ship's wiring.
Bob . . .
No virus found in this message.
Checked by AVG - www.avg.com
Message 6
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| Subject: | Aircraft Part Fell From Sky |
Listers:
This Part fell off of some type of aircraft and punched a hole in a friends
roof out in Gold Canyon, AZ.
Can anyone help identify this?
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