Today's Message Index:
----------------------
1. 10:04 AM - CJ-6 Panel Compass (jrittenbach)
2. 10:25 AM - Re: CJ-6 Panel Compass (Brian Lloyd)
3. 11:48 AM - Re: CJ-6 Panel Compass (doug sapp)
4. 01:38 PM - Re: CJ-6 Panel Compass (Roger Kemp)
Message 1
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| Subject: | CJ-6 Panel Compass |
Greetings,
Gentlemen, Im scratching my head again (almost bald) trying to get my compass to
work. I have a 1973 CJ-6 with the original standard Chinese panel compass in
the front and rear cockpit panels.
My problems started after I replaced the rear gear valve handle. I pushed the
front seat ahead and stood behind the seat to replace the valve. I found the next
time I started and flew the aircraft that neither compass would turn unless
I push the slave button.
Both front and rear cockpit compass act exactly the same. Each will turn to the
correct direction while pushing either the front or rear slave buttons without
problems. Its just that neither compass will turn a millimeter on their own
from a change in direction of the aircraft without holding down the slave button.
To troubleshoot the problem, I removed the TH-3(Compass Gyro), FL-3(Compass Amplifier)
and GHC-2 (Compass sensor in tail) and tried all 3 in a neighboring functional
CJ. All worked perfectly fine in the other aircraft. I looked for loose
wiring near the above listed parts, the rear cockpit gear valve and next
to where my feet were located during the valve change but didnt find anything
out of the ordinary.
Has anyone run into this problem before? Any ideas?
Thanks,
Jon Rittenbach
--------
J Rittenbach
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=357633#357633
Message 2
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| Subject: | Re: CJ-6 Panel Compass |
On Sat, Nov 12, 2011 at 9:59 AM, jrittenbach <jrittenbach@rocketmail.com>wr
ote:
>
>
> Greetings,
> Gentlemen, I=92m scratching my head again (almost bald) trying to get my
> compass to work. I have a 1973 CJ-6 with the original standard Chinese
> panel compass in the front and rear cockpit panels.
> My problems started after I replaced the rear gear valve handle. I pushe
d
> the front seat ahead and stood behind the seat to replace the valve. I
> found the next time I started and flew the aircraft that neither compass
> would turn unless I push the slave button.
> Both front and rear cockpit compass act exactly the same. Each will turn
> to the correct direction while pushing either the front or rear slave
> buttons without problems. It=92s just that neither compass will turn a
> millimeter on their own from a change in direction of the aircraft withou
t
> holding down the slave button.
>
> To troubleshoot the problem, I removed the TH-3(Compass Gyro),
> FL-3(Compass Amplifier) and GHC-2 (Compass sensor in tail) and tried all
3
> in a neighboring functional CJ. All worked perfectly fine in the other
> aircraft. I looked for loose wiring near the above listed parts, the re
ar
> cockpit gear valve and next to where my feet were located during the valv
e
> change but didn=92t find anything out of the ordinary.
>
> Has anyone run into this problem before? Any ideas?
>
This system is very old-school (surprise!). The magnetic sensor, instead of
being a flux-gate as we use here, is actually a huge magnetic compass
driving a synchro transformer. That in turn drives a slaving motor in the
remove gyro. If you press the fast-slew (what you are calling the "slaving"
button) and it moves around to the proper heading, it probably means that
the horizontal gyro itself is not spinning up and acting like a gyro. When
you press the fast-slew button, you are letting the slaving motor drive the
gyro to the proper heading based on the magnetic compass source. So, while
it is moving to the proper heading, it is not a gyro-stabilized heading. My
guess is that it could be the three-phase 30V power not reaching the motor
in the horizontal gyro itself.
It may be time to consider something much more reliable than 50-year-old
electromechanical systems with motor-generator inverters and vacuum-tube
amplifiers.
--
Brian Lloyd, WB6RQN/J79BPL
3191 Western Dr.
Cameron Park, CA 95682
brian@lloyd.com
+1.767.617.1365 (Dominica)
+1.916.877.5067 (USA)
Message 3
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| Subject: | Re: CJ-6 Panel Compass |
Jon,
If all components are good it has to be either a breaker/switch or wiring.
Doug
On Sat, Nov 12, 2011 at 9:59 AM, jrittenbach <jrittenbach@rocketmail.com>wr
ote:
>
>
> Greetings,
> Gentlemen, I=92m scratching my head again (almost bald) trying to get my
> compass to work. I have a 1973 CJ-6 with the original standard Chinese
> panel compass in the front and rear cockpit panels.
> My problems started after I replaced the rear gear valve handle. I pushe
d
> the front seat ahead and stood behind the seat to replace the valve. I
> found the next time I started and flew the aircraft that neither compass
> would turn unless I push the slave button.
> Both front and rear cockpit compass act exactly the same. Each will turn
> to the correct direction while pushing either the front or rear slave
> buttons without problems. It=92s just that neither compass will turn a
> millimeter on their own from a change in direction of the aircraft withou
t
> holding down the slave button.
>
> To troubleshoot the problem, I removed the TH-3(Compass Gyro),
> FL-3(Compass Amplifier) and GHC-2 (Compass sensor in tail) and tried all
3
> in a neighboring functional CJ. All worked perfectly fine in the other
> aircraft. I looked for loose wiring near the above listed parts, the re
ar
> cockpit gear valve and next to where my feet were located during the valv
e
> change but didn=92t find anything out of the ordinary.
>
> Has anyone run into this problem before? Any ideas?
> Thanks,
> Jon Rittenbach
>
> --------
> J Rittenbach
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=357633#357633
>
>
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>
>
Message 4
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| Subject: | Re: CJ-6 Panel Compass |
Get a Dynon D10 and save your hair.
Doc
-----Original Message-----
>From: jrittenbach <jrittenbach@rocketmail.com>
>Sent: Nov 12, 2011 11:59 AM
>To: yak-list@matronics.com
>Subject: Yak-List: CJ-6 Panel Compass
>
>
>Greetings,
>Gentlemen, Im scratching my head again (almost bald) trying to get my compass
to work. I have a 1973 CJ-6 with the original standard Chinese panel compass
in the front and rear cockpit panels.
>My problems started after I replaced the rear gear valve handle. I pushed the
front seat ahead and stood behind the seat to replace the valve. I found the
next time I started and flew the aircraft that neither compass would turn unless
I push the slave button.
>Both front and rear cockpit compass act exactly the same. Each will turn to the
correct direction while pushing either the front or rear slave buttons without
problems. Its just that neither compass will turn a millimeter on their own
from a change in direction of the aircraft without holding down the slave button.
>
>To troubleshoot the problem, I removed the TH-3(Compass Gyro), FL-3(Compass Amplifier)
and GHC-2 (Compass sensor in tail) and tried all 3 in a neighboring functional
CJ. All worked perfectly fine in the other aircraft. I looked for
loose wiring near the above listed parts, the rear cockpit gear valve and next
to where my feet were located during the valve change but didnt find anything
out of the ordinary.
>
>Has anyone run into this problem before? Any ideas?
>Thanks,
>Jon Rittenbach
>
>--------
>J Rittenbach
>
>
>Read this topic online here:
>
>http://forums.matronics.com/viewtopic.php?p=357633#357633
>
>
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