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Search: Posts Made By: Mich48041
Forum: COMM 11-27-2020, 12:14 PM
Replies: 4
Views: 311
Posted By Mich48041
Found this old thread about the Bose A20...

Found this old thread about the Bose A20 Headset
https://vansairforce.com/community/showthread.php?t=60743
Forum: RV-12/RV-12iS 11-25-2020, 08:20 PM
Replies: 16
Views: 1,168
Posted By Mich48041
Many (most?) RV-12s have a faston splice in the...

Many (most?) RV-12s have a faston splice in the ignition wires on the forward side of the firewall.
I think that is what JBPILOT was referring to.
Find those splices, unplug and plug together those...
Forum: Electrical Systems 11-25-2020, 05:24 AM
Replies: 77
Views: 16,653
Posted By Mich48041
If the voltage is above 14, then the charging...

If the voltage is above 14, then the charging system is working fine.
If you have any more problems starting the engine, the next things to check are
wire terminations, battery contactor, starter...
Forum: Electrical Systems 11-22-2020, 08:52 PM
Replies: 12
Views: 1,295
Posted By Mich48041
David, did you fix the master contractor problem?

David, did you fix the master contractor problem?
Forum: RV-12/RV-12iS 11-22-2020, 08:45 AM
Replies: 24
Views: 1,500
Posted By Mich48041
Lon, I was thinking of the ADAHRS end of the...

Lon, I was thinking of the ADAHRS end of the cable when I posted above. But
you are correct that the problem could be at the forward end of the cable. Do
not assume that the mechanic carefully...
Forum: RV-12/RV-12iS 11-21-2020, 06:16 PM
Replies: 24
Views: 1,500
Posted By Mich48041
The first place that I would check is at the...

The first place that I would check is at the ADAHRS. Like Bob Leffler wrote,
make sure the D-Sub pins are seated properly. Unplugging and plugging in a
few times will wear away corrosion. Since...
Forum: RV-12/RV-12iS 11-20-2020, 08:44 PM
Replies: 24
Views: 1,500
Posted By Mich48041
The failures are likely to be caused by a bad...

The failures are likely to be caused by a bad connection(s). I suggest that
you take every connection apart and inspect it, then put it back together.
Forum: Electrical Systems 11-13-2020, 02:45 PM
Replies: 12
Views: 1,295
Posted By Mich48041
kaweeka, did you find the problem? Was it the...

kaweeka, did you find the problem? Was it the master switch?
Forum: RV-12/RV-12iS 11-11-2020, 06:33 PM
Replies: 20
Views: 2,854
Posted By Mich48041
Bill, welcome to VansAirforce.

Bill, welcome to VansAirforce.
Forum: Electrical Systems 11-08-2020, 01:05 PM
Replies: 12
Views: 1,295
Posted By Mich48041
mfleming suggested another good test. Connect...

mfleming suggested another good test. Connect the red voltmeter probe to
the battery contactor small terminal and the black probe to ground. The meter
should read battery voltage with the master...
Forum: Electrical Systems 11-08-2020, 11:39 AM
Replies: 29
Views: 2,384
Posted By Mich48041
There is no such thing as a voltage spike during...

There is no such thing as a voltage spike during engine starting. That is an old
wives tale. The voltage SAGS during engine starting. That voltage sag did
cause transistors to fail back in the...
Forum: Electrical Systems 11-08-2020, 11:26 AM
Replies: 12
Views: 1,295
Posted By Mich48041
Connect a voltmeter to battery contactor with red...

Connect a voltmeter to battery contactor with red probe on battery terminal
and black lead on small terminal. Turn on master switch and observe voltage.
If voltage across contactor terminals is...
Forum: RV-12/RV-12iS 11-08-2020, 11:12 AM
Replies: 7
Views: 764
Posted By Mich48041
All LED lights need a series resistor to limit...

All LED lights need a series resistor to limit the current. LED lights that are
advertised to to work on 12 volts have an internal resistor that you might not
be able to see. If you want the LED...
Forum: RV-12/RV-12iS 11-07-2020, 12:21 PM
Replies: 4
Views: 894
Posted By Mich48041
The Org/Brn wire connects to the fuel level...

The Org/Brn wire connects to the fuel level sender.
The black wire is a ground wire and it connects to a fuel level sender mounting screw.
Use a star type lock washer to achieve a good electrical...
Forum: RV-12/RV-12iS 11-05-2020, 09:17 PM
Replies: 20
Views: 1,989
Posted By Mich48041
Mel, is that true?

Mel, is that true?
Forum: Electrical Systems 11-04-2020, 11:53 AM
Replies: 20
Views: 2,243
Posted By Mich48041
If the voltage remains constant at 14.2 volts,...

If the voltage remains constant at 14.2 volts, then the charging system is
working perfectly. Any fluctuation of current is due to either an indication
problem (likely) or a fluctuating load...
Forum: RV-12/RV-12iS 11-02-2020, 06:19 PM
Replies: 5
Views: 965
Posted By Mich48041
Thanks Scott. I assume from your reply that the...

Thanks Scott. I assume from your reply that the engine does not need to be
running to view engine parameters on the Skyview display. The only
requirements are that the Skyview is on and the lane...
Forum: RV-12/RV-12iS 11-02-2020, 12:28 PM
Replies: 5
Views: 965
Posted By Mich48041
CAN BUS

A friend wants to start his 912iS engine for the first time but is afraid to
because all of engine parameters have a red X on the Skyview HDX display.
Does the engine have to be running in order to...
Forum: RV-12/RV-12iS 11-02-2020, 10:29 AM
Replies: 3
Views: 658
Posted By Mich48041
Yes, RV-12 owners have inadvertently shorted the...

Yes, RV-12 owners have inadvertently shorted the wire going to regulator terminal C and
have blown the 1 amp fuse. You are correct that terminal C gets voltage from the master switch.
Do NOT jumper...
Forum: RV-12/RV-12iS 10-27-2020, 03:34 PM
Replies: 13
Views: 1,618
Posted By Mich48041
What is a circlip?

What is a circlip?
Forum: RV-12/RV-12iS 10-21-2020, 01:30 PM
Replies: 25
Views: 8,293
Posted By Mich48041
Tires absorb some of the shock when landing. ...

Tires absorb some of the shock when landing. Correct tire pressure is especially important on the nose wheel.
Forum: RV-12/RV-12iS 10-16-2020, 06:23 PM
Replies: 3
Views: 1,029
Posted By Mich48041
It is no bid deal. If you can not find ready...

It is no bid deal. If you can not find ready made jumpers, just make your own.
Forum: Electrical Systems 10-16-2020, 05:52 AM
Replies: 3
Views: 509
Posted By Mich48041
Honeywell AML34

alliedelec.com
-
https://www.mouser.com/Search/Refine?Keyword=AML34
-
https://www.digikey.com/en/products/detail/honeywell-sensing-and-productivity-solutions/AML34FBA4AC01/1248773
Forum: Electrical Systems 10-13-2020, 10:37 AM
Replies: 17
Views: 1,214
Posted By Mich48041
Split lock washers are not really lock washers. ...

Split lock washers are not really lock washers. Nord Lock did vibration testing of
various lock washers. Split ring washers actually cause a fastener to loosen
quicker than no washer at all. I...
Forum: Electrical Systems 10-11-2020, 07:34 PM
Replies: 7
Views: 699
Posted By Mich48041
R1 limits current in case wire shorts to...

R1 limits current in case wire shorts to ground.
R2 pulls voltage low when circuit is open.
Diode shorts out induced voltage spikes if there are any.
Starter solenoid will not be affected.
Forum: Electrical Systems 10-08-2020, 08:49 PM
Replies: 6
Views: 628
Posted By Mich48041
It is not a good idea to have fuses in series. A...

It is not a good idea to have fuses in series. A hard short circuit can blow both the load
fuse and the main fuse or circuit breaker. I would keep the wire short (less than six inches)
between the...
Forum: Electrical Systems 10-01-2020, 09:52 PM
Replies: 4
Views: 780
Posted By Mich48041
The fuse should be located at the battery end of...

The fuse should be located at the battery end of the B
lead to protect the battery and B lead from short circuits.
An alternator can not produce much more than its rated output.
An alternator is self...
Forum: Electrical Systems 09-30-2020, 01:14 PM
Replies: 8
Views: 864
Posted By Mich48041
AGM batteries like yours normally do not need to...

AGM batteries like yours normally do not need to be charged if the aircraft is flown once per month or so.
The problem with a 14 volt power supply is that the voltage does not taper off over time.
A...
Forum: Electrical Systems 09-28-2020, 07:12 PM
Replies: 10
Views: 1,505
Posted By Mich48041
John S You are right. The avionics master switch...

John S
You are right. The avionics master switch is an unnecessary failure point.
Read what Bob Nuckolls has to say about...
Forum: Electrical Systems 09-28-2020, 07:10 PM
Replies: 10
Views: 1,505
Posted By Mich48041
Larry, In case of smoke or fire in the cockpit,...

Larry,
In case of smoke or fire in the cockpit, the master can be shut off.
In case of an imminent forced landing, shutting off the master will minimize the chances of fire after a collision.
A...
Forum: Electrical Systems 09-28-2020, 04:53 AM
Replies: 4
Views: 548
Posted By Mich48041
Ninety nine percent of RV-12s do not have an...

Ninety nine percent of RV-12s do not have an E-Bus.
Your electrical system is unique. Only the builder knows how it was wired.
Forum: Electrical Systems 09-27-2020, 06:42 PM
Replies: 4
Views: 548
Posted By Mich48041
A diode in the circuit will drop up to one volt...

A diode in the circuit will drop up to one volt or so depending
on the type of diode and the current flowing through it.
Forum: RV-12/RV-12iS 09-26-2020, 01:15 PM
Replies: 20
Views: 2,998
Posted By Mich48041
I would not do it. What will hold the oil cooler...

I would not do it. What will hold the oil cooler in position?
What about carburetor ice?
What about other things that can go wrong that nobody knows about until experimenting?
Sometimes it is easier...
Forum: Electrical Systems 09-24-2020, 03:02 AM
Replies: 5
Views: 817
Posted By Mich48041
How are you checking for power, with a digital...

How are you checking for power, with a digital meter? If so, try using a
12 volt test light instead, the type that does NOT have an internal battery.
Forum: Electrical Systems 09-22-2020, 06:32 PM
Replies: 3
Views: 696
Posted By Mich48041
Shunts do go bad. But more likely is a bad...

Shunts do go bad. But more likely is a bad connection on the shunt.
Remove all terminals from the shunt, clean and reconnect.
Forum: RV-12/RV-12iS 09-22-2020, 05:19 PM
Replies: 36
Views: 3,963
Posted By Mich48041
Has anyone tried an accumulator?

Has anyone tried an accumulator?
Forum: Electrical Systems 09-15-2020, 08:54 PM
Replies: 4
Views: 847
Posted By Mich48041
FULLRIVER HC20 batteries do not seem to be...

FULLRIVER HC20 batteries do not seem to be available in the United States.
Some Chinese knockoffs are available that are "compatible replacement" for the FULLRIVER HC20.
The "replacement" batteries...
Forum: RV-12/RV-12iS 09-15-2020, 01:45 PM
Replies: 7
Views: 1,260
Posted By Mich48041
Van's offers a 3 blade prop for the...

Van's offers a 3 blade prop for the RV-12.
https://www.vansaircraft.com/wp-content/uploads/2019/01/RV-12-powerplant.pdf
and
https://vansairforce.com/community/showthread.php?t=179257
Forum: RV-12/RV-12iS 09-12-2020, 07:42 AM
Replies: 7
Views: 1,232
Posted By Mich48041
In the U.S.A., an RV-12 can be registered by the...

In the U.S.A., an RV-12 can be registered by the factory (only) as SLSA.
Home builders may NOT register their RV-12 as S-LSA.
If you buy a factory-built S-LSA, you may convert it to E-LSA if...
Forum: Electrical Systems 09-11-2020, 07:05 PM
Replies: 2
Views: 690
Posted By Mich48041
The fans are wired in parallel with the electric...

The fans are wired in parallel with the electric fuel pump. Power to the fans
comes from the AV-50000A fuselage D-Sub pin 28, a wht/red wire. Polarity
matters. The fan black wire connects to...
Forum: RV-12/RV-12iS 09-08-2020, 08:52 AM
Replies: 16
Views: 2,769
Posted By Mich48041
For most pilots, "fast transportation" is not a...

For most pilots, "fast transportation" is not a valid reason for owning an airplane. Short trips are quicker by car. Long trips are quicker and less expensive and safer via airlines. Trips of 200...
Forum: Electrical Systems 09-07-2020, 08:47 AM
Replies: 9
Views: 1,007
Posted By Mich48041
If the charging voltage is 14.3 and the AC...

If the charging voltage is 14.3 and the AC component is less than one volt, then the charging system is working fine.
Forum: Electrical Systems 08-31-2020, 10:57 AM
Replies: 1
Views: 480
Posted By Mich48041
Do you have crowbar over-voltage protection? Is...

Do you have crowbar over-voltage protection?
Is the circuit breaker in the field circuit or in the "B" lead circuit?
What size is the circuit breaker?
Make sure that the electrical connections on the...
Forum: RV General Discussion/News 08-29-2020, 10:01 AM
Replies: 35
Views: 3,394
Posted By Mich48041
The way to deal with negative comments is to tell...

The way to deal with negative comments is to tell the person how their comments affect you.
Do not be defensive or make excuses for your shortcomings.
Do not become aggressive and attack the other...
Forum: RV-12/RV-12iS 08-29-2020, 09:46 AM
Replies: 257
Views: 78,885
Posted By Mich48041
Some General Suggestions

Mount the voltage regulator using heat conductive paste between the mating aluminum surfaces.
Use a shroud and forced air blast tube to keep the regulator cool.
Connect a heavy 12 or 10 AWG wire from...
Forum: RV-12/RV-12iS 08-26-2020, 08:16 PM
Replies: 43
Views: 9,037
Posted By Mich48041
I agree with you Jim. It is a head scratcher. A...

I agree with you Jim. It is a head scratcher. A chart or graph is needed
with columns and rows that contain part numbers and characteristics.
Forum: Electrical Systems 08-25-2020, 08:10 AM
Replies: 42
Views: 3,065
Posted By Mich48041
Have you tried shutting off one ignition at a...

Have you tried shutting off one ignition at a time while flying to see if doing that has any affect on the noise?
Forum: Electrical Systems 08-25-2020, 07:58 AM
Replies: 39
Views: 3,373
Posted By Mich48041
Daida, It sounds like a good plan to me.

Daida, It sounds like a good plan to me.
Forum: Electrical Systems 08-24-2020, 08:14 AM
Replies: 39
Views: 3,373
Posted By Mich48041
Since the voltage drops when the current rises,...

Since the voltage drops when the current rises, that indicates that there is a
very heavy load or short circuit. That current was NOT going into the battery.
Is it possible that the 4G Pull up...
Forum: RV-12/RV-12iS 08-23-2020, 08:50 PM
Replies: 25
Views: 3,012
Posted By Mich48041
How do you know the indicated pressure is...

How do you know the indicated pressure is accurate?
Forum: Electrical Systems 08-23-2020, 12:26 PM
Replies: 42
Views: 3,065
Posted By Mich48041
A faulty spark plug wire caused a similar...

A faulty spark plug wire caused a similar problem. You can read about it here:
http://forums.matronics.com/viewtopic.php?t=16775880
Forum: RV-12/RV-12iS 08-23-2020, 07:21 AM
Replies: 39
Views: 3,837
Posted By Mich48041
Adding to what Mike said, since two wires are...

Adding to what Mike said, since two wires are shorting to ground, maybe it is
where they pass through a hole in aluminum. Perhaps a problem with a
grommet or maybe that over rudder wireway. That...
Forum: Electrical Systems 08-22-2020, 07:53 PM
Replies: 42
Views: 3,065
Posted By Mich48041
On my RV-12, there are two ignition switches that...

On my RV-12, there are two ignition switches that are used for mag check and
for shutting off the engine. There is coaxial cable running between those switches
and the ignition modules. Like I...
Forum: Electrical Systems 08-22-2020, 07:25 PM
Replies: 42
Views: 3,065
Posted By Mich48041
How are the ignition switches wired? The shield...

How are the ignition switches wired? The shield of the ignition coax cable
should not be continuous from end to end. On my plane,
the magneto shield is grounded at both ends, however the shield...
Forum: RV-12/RV-12iS 08-21-2020, 05:13 PM
Replies: 39
Views: 3,837
Posted By Mich48041
Tony, I suggest that you bypass Van's AV-50000A. ...

Tony, I suggest that you bypass Van's AV-50000A. It is only a junction box. It
also has that resistor. But like Mike said, the resistor is supposed to be across
the switch, not in a junction...
Forum: RV-12/RV-12iS 08-20-2020, 09:13 AM
Replies: 24
Views: 5,029
Posted By Mich48041
My Interpretation

NinerBikes has done nothing illegal. His "passengers" are actually licensed pilots who are, legally speaking, pilot in command and log their time in the aircraft as pilot in command in their log...
Forum: RV-12/RV-12iS 08-19-2020, 09:46 PM
Replies: 39
Views: 3,837
Posted By Mich48041
With everything connected, pin 4 at the servos...

With everything connected, pin 4 at the servos should have 5k ohms resistance to
ground. If the autopilot disconnect switch is pressed, the resistance should drop to zero.
Forum: RV-12/RV-12iS 08-19-2020, 08:50 PM
Replies: 39
Views: 3,837
Posted By Mich48041
Why did you deduce that? Unless I am...

Why did you deduce that? Unless I am misunderstanding you, I think the problem is with the orange/yellow wire.
Try disconnecting it at the servos to see what happens.
Forum: RV-12/RV-12iS 08-19-2020, 07:17 PM
Replies: 39
Views: 3,837
Posted By Mich48041
According to the schematic that I am looking at,...

According to the schematic that I am looking at, the autopilot disconnect switch
is NOT connected to the Skyview. The wire from the disconnect switch
connects to an orange/yellow wire from the...
Forum: Electrical Systems 08-13-2020, 01:08 PM
Replies: 42
Views: 3,065
Posted By Mich48041
What happens if you completely disconnect the...

What happens if you completely disconnect the coax from the radio and go flying?
Does the static go away? If so, that test confirms the static is coming from the antenna.
Do not transmit with the...
Forum: Electrical Systems 08-12-2020, 07:41 PM
Replies: 52
Views: 8,332
Posted By Mich48041
My 6-year-old PC680 failed suddenly while flying....

My 6-year-old PC680 failed suddenly while flying. It had started the engine just fine.
A weld inside of the battery failed. I did not realize that the battery failed until
closing the throttle to...
Forum: Electrical Systems 08-12-2020, 07:32 PM
Replies: 42
Views: 3,065
Posted By Mich48041
A simple cheap antenna will perform just as good...

A simple cheap antenna will perform just as good as an expensive one if it is
installed properly. The antenna rod is NOT grounded whatsoever. The coax
shield is what is connected to the ground...
Forum: Electrical Systems 08-12-2020, 05:33 PM
Replies: 42
Views: 3,065
Posted By Mich48041
The center of the coax is connected to the...

The center of the coax is connected to the antenna through the center pin of
the BNC connector. The shield of the coax is connected to the antenna base.
The antenna base MUST be electrically...
Forum: Electrical Systems 08-12-2020, 01:13 PM
Replies: 42
Views: 3,065
Posted By Mich48041
If you have not checked the antenna using a SWR...

If you have not checked the antenna using a SWR meter, you should.
The SWR should be 2 or less on all frequencies. Ask around, someone might
have a SWR meter that you can use. If not, eBay...
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