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CJ-6 Panel Compass

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jrittenbach

Joined: 08 Nov 2011
Posts: 7

Posted: Sat Nov 12, 2011 9:58 am Post subject: CJ-6 Panel Compass

Greetings,

Gentlemen, Iâ€™m 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.  Itâ€™s 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 didnâ€™t find anything out of the ordinary.

 

Has anyone run into this problem before?  Any ideas?

Thanks,

Jon Rittenbach

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J Rittenbach

brian(at)lloyd.com
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Posted: Sat Nov 12, 2011 10:25 am Post subject: CJ-6 Panel Compass

On Sat, Nov 12, 2011 at 9:59 AM, jrittenbach <jrittenbach(at)rocketmail.com (jrittenbach(at)rocketmail.com)> wrote:

 	  Quote: 	
		   --> Yak-List message posted by: "jrittenbach" <jrittenbach(at)rocketmail.com (jrittenbach(at)rocketmail.com)>

 

 Greetings,

 Gentlemen, I’m 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.  It’s 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 didn’t 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(at)lloyd.com (brian(at)lloyd.com)

+1.767.617.1365 (Dominica)

+1.916.877.5067 (USA)



  [quote][b]

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dougsappllc(at)gmail.com
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Posted: Sat Nov 12, 2011 11:48 am Post subject: 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(at)rocketmail.com (jrittenbach(at)rocketmail.com)> wrote:

 [quote]--> Yak-List message posted by: "jrittenbach" <jrittenbach(at)rocketmail.com (jrittenbach(at)rocketmail.com)>

  

 Greetings,

 Gentlemen, I’m 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.  It’s 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 didn’t find anything out of the ordinary.

  

 Has anyone run into this problem before?  Any ideas?

 Thanks,

 Jon Rittenbach

 

 --------

 J Rittenbach

 

 

 

 

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viperdoc(at)mindspring.co
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Posted: Sat Nov 12, 2011 1:38 pm Post subject: CJ-6 Panel Compass

Get a Dynon D10 and save your hair.

Doc



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jrittenbach

Joined: 08 Nov 2011
Posts: 7

Posted: Fri Nov 18, 2011 4:24 pm Post subject: Re: CJ-6 Panel Compass

Thanks everyone for the advice.  I really enjoy that old Chinese compass.  Lot of nostalgia there.  Iâ€™d like to keep it.  Donâ€™t want to inop it or update the compass in front and rear if there is a fix. Has anyone had a problem with the junction box(EX-2)?  How about the inverter?  If the inverter isnâ€™t functioning well, could it result in the compass not rotating without causing problems with the artificial horizon?  Otherwise, Iâ€™m still looking for bad connections or loose wires.



Jon Rittenbach

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J Rittenbach

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