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audio panel and com wiring

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dballin

Joined: 11 Nov 2007
Posts: 11

Posted: Mon Mar 08, 2010 7:02 pm Post subject: audio panel and com wiring

This may be obvious to most, but I found a flaw in my wiring schema

that I figured I'd share.  This is somewhat specific, but I am sure

many are in a similar situation.  I have a Lancair Legacy with a PMA

7000 audio panel and SL30 as com 1 and an SL40 as com 2.  I wired the

panel using Z-14 (2 separate battery/alternator busses).  The issue is

that I wired com 1 and the audio panel on the same buss, so if I loose

power on that buss, I have lost the ability to use a com.  Since the

default for the PMA when it is off is com1, com 2 is not available.

The solution is to make sure com 1 and the audio panel are on

different busses.  Of course all I have to do is hit the crossfeed and

things are good again, but in a busy stressful situation I'd rather

have the default a working com.



Dan Ballin

LEG2 #286

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MauleDriver(at)nc.rr.com
Guest

Posted: Tue Mar 09, 2010 3:27 am Post subject: audio panel and com wiring

Not obvious here.  Turns out I have the same situation.



I'm not sure this concerns me.  But will have to think about it.  Seems 

easily fixed at this point.



Thanks.

Bill Watson

RV10 with a Z-14



Dan Ballin wrote:

 	  Quote: 	
		   



 This may be obvious to most, but I found a flaw in my wiring schema

 that I figured I'd share.  This is somewhat specific, but I am sure

 many are in a similar situation.  I have a Lancair Legacy with a PMA

 7000 audio panel and SL30 as com 1 and an SL40 as com 2.  I wired the

 panel using Z-14 (2 separate battery/alternator busses).  The issue is

 that I wired com 1 and the audio panel on the same buss, so if I loose

 power on that buss, I have lost the ability to use a com.  Since the

 default for the PMA when it is off is com1, com 2 is not available.

 The solution is to make sure com 1 and the audio panel are on

 different busses.  Of course all I have to do is hit the crossfeed and

 things are good again, but in a busy stressful situation I'd rather

 have the default a working com.



 Dan Ballin

 LEG2 #286

- The Matronics AeroElectric-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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nuckolls.bob(at)aeroelect
Guest

Posted: Tue Mar 09, 2010 7:02 am Post subject: audio panel and com wiring

At 05:21 AM 3/9/2010, you wrote:

 	  Quote: 	
		  

<MauleDriver(at)nc.rr.com>



Not obvious here.  Turns out I have the same situation.



I'm not sure this concerns me.  But will have to think about 

it.  Seems easily fixed at this point.


	


    This goes to the final stages of a well crafted

    Failure Modes Effects Analysis . . . verification.

    And the best time to do verification is sitting

    in the shop, not cruising at 9K.



    For folks who have intercom/audio systems, be

    sure that the power-off situation for your

    intercom defaults to a hard-connected feed through

    of mic and headset audio to at least one comm

    radio. Also, if your intercom doesn't have

    it's own power switch, you might want to add one

    so that a mis-behaving system can be shut off.



    If the audio system doesn't have a power-down

    feed-through system (like our 9009 audio isolation

    amplifier) then hard-wired mic and headset jacks

    as illustrated in



http://www.aeroelectric.com/Catalog/AEC/9009/9009-700L.pdf



    are called for. Of course, your personal plan-B

    could simply revert to a flight-bag hand-held.

    What ever your plan-b, its a really good idea to

    make sure "the plan" works before you need it.



    Bob . . .

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