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  #11  
Old 12-28-2019, 07:31 PM
g3xpert's Avatar
g3xpert g3xpert is offline
 
Join Date: Sep 2010
Location: Olathe, KS
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Quote:
Originally Posted by jamesdavid View Post
I have been pouring over the Garmin install manuals for the G3X, GNC375, and GNC255 trying to figure out how this all fits together to achieve the second option in my original post (G5, G3X, GNC255, GNC375).

Any thoughts on this high level diagram (am I forgetting any connections / hooking this up in the best way)?

Thanks again, Everyone.
James
Hello James,

Your diagram looks pretty good! Just a couple of comments on the GNX 375 installation.

1. The GNX 375 receives altitude data directly from the GSU 25 ADAHRS, so it is not necessary to install the GAE 12 altitude encoder on the back of the unit or connect the static line.
2. The bi-directional RS-232 connections from the GNX 375 to the PFD are MapMX and Connext as shown on page 27-35 of the Rev. AL G3X Installation Manual.
3. There is an EFIS/Airdata A429 connection from the GAD 29 to the GNX 375.
4. There is only the single GPS A429 connection from the GNX 375 to the GAD 29.
5. Any additional GDU 4XX displays in your system will have a Connext RS-232 connection to the GNX 375 so that they may receive ADS-B Traffic/Weather.

Thanks,
Steve
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  #12  
Old 12-28-2019, 07:35 PM
jamesrw2002 jamesrw2002 is offline
 
Join Date: Jul 2019
Location: Dallas, TX
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Hey James,

What you're doing and what I'm doing is somewhat similar. Are you doing the harness yourself or are you going to outsource it?


Quote:
Originally Posted by jamesdavid View Post
I have been pouring over the Garmin install manuals for the G3X, GNC375, and GNC255 trying to figure out how this all fits together to achieve the second option in my original post (G5, G3X, GNC255, GNC375).

Any thoughts on this high level diagram (am I forgetting any connections / hooking this up in the best way)?



Thanks again, Everyone.
James
__________________
James Walsh
RV-4 based at 52F
G550 Based at VHHH
... or LGB.. or ZHHH... or wherever they tell me to put the thing.
Proudly paid the donation!
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  #13  
Old 12-29-2019, 04:39 PM
jamesdavid jamesdavid is offline
 
Join Date: Nov 2017
Location: Tempe, AZ
Posts: 20
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Steve / g3xpert,

Thank you so much for the quick and detailed response here! Very helpful! Updated diagram based on your feedback.

Regarding your point 1. Is there any benefit to using the GAE 12 in addition to the GSU 25?



Best,
James

Quote:
Originally Posted by g3xpert View Post
Hello James,

Your diagram looks pretty good! Just a couple of comments on the GNX 375 installation.

1. The GNX 375 receives altitude data directly from the GSU 25 ADAHRS, so it is not necessary to install the GAE 12 altitude encoder on the back of the unit or connect the static line.
2. The bi-directional RS-232 connections from the GNX 375 to the PFD are MapMX and Connext as shown on page 27-35 of the Rev. AL G3X Installation Manual.
3. There is an EFIS/Airdata A429 connection from the GAD 29 to the GNX 375.
4. There is only the single GPS A429 connection from the GNX 375 to the GAD 29.
5. Any additional GDU 4XX displays in your system will have a Connext RS-232 connection to the GNX 375 so that they may receive ADS-B Traffic/Weather.

Thanks,
Steve
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  #14  
Old 12-29-2019, 05:14 PM
jamesdavid jamesdavid is offline
 
Join Date: Nov 2017
Location: Tempe, AZ
Posts: 20
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James,

The wiring harness I am somewhat confident that I could do well (I have an electrical engineering degree). I am more concerned about metal fabrication and finish for the new panel. The original builder did a great job and I want to make it look just as nice.

Quote:
Originally Posted by jamesrw2002 View Post
Hey James,

What you're doing and what I'm doing is somewhat similar. Are you doing the harness yourself or are you going to outsource it?
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Last edited by jamesdavid : 01-04-2020 at 09:12 PM.
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  #15  
Old 12-29-2019, 05:44 PM
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g3xpert g3xpert is offline
 
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Location: Olathe, KS
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Quote:
Originally Posted by jamesdavid View Post
Steve / g3xpert,

Thank you so much for the quick and detailed response here! Very helpful! Updated diagram based on your feedback.

Regarding your point 1. Is there any benefit to using the GAE 12 in addition to the GSU 25?

Best,
James
Hello James,

You are very welcome.

There are some places around the world that require that the transponder used in the ATC system be certified and use a certified pressure altitude source.

For those rare instances, the certified GAE 12 pressure sensor provides a means for those installations to be compliant.

Most of us vastly prefer that the GSU 25 ADAHRS that is providing data to the primary flight display also provide altitude data to the transponder.

Having a single air data source should also make it less expensive to complete the periodic transponder check.

Thanks,
Steve
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Please email us for support instead of using Private Messaging due to the limitations of the latter.
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  #16  
Old 12-31-2019, 04:03 PM
jamesdavid jamesdavid is offline
 
Join Date: Nov 2017
Location: Tempe, AZ
Posts: 20
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g3xpert / Steve,

Some additional questions came up as I have been reading more of your other threads and the install manual.

Any benefit to:
  • GNX 375 / G5: Adding an additional MapMX connection from the GNX375 to the G5? I saw this post in another thread:

    Quote:
    “We recommend you connect the MapMX serial interface from the much higher capability GTN 625 to the G5 serial port input like shown on page 62 of the Rev. C G5 Installation manual. Note that this same GTN serial output is also connected to the PFD. With this installation, you could turn off both the GDU 460/470 displays and still fly an autopilot coupled LPV approach with the GTN 625 and G5, and of course fly an autopilot coupled flight plan entered on the GTN anywhere you like.” http://www.vansairforce.com/communit...d.php?t=148601
  • GNC 255 / GAD 29: Adding an ARINC connection to the GAD 29 from the GNC 255 (in addition to the RS-232 connection to PFD1)? (Would this put the VOR/ILS information on the CAN bus, since I have the GAD 29 for the GNX 375, should I use it with the GNC 255 also, or should I just use the RS-232 connection for the GNC 255?)

  • Thinking Ahead for PFD2 ... If I Wire a Connector for PFD 2, and then do not install the PFD, will everything continue to work without issues (e.g., CAN bus wont break without a node at the connector) but allow for me to add in a PFD2 at a later time?

To Everyone,
  • Regarding Lighting Bus. Do people doing an all Garmin panel find that using the photocells work well, or should I plan to wire up a lighting bus based on what people have experienced in the real world?
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Last edited by jamesdavid : 01-12-2020 at 07:20 PM.
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  #17  
Old 01-04-2020, 12:50 PM
rchrds rchrds is offline
 
Join Date: Mar 2013
Location: Fayetteville
Posts: 13
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Can someone drop a link to the GNX 375 installation manual please? I can't find it on the Garmin site.

Thanks!
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  #18  
Old 01-04-2020, 01:29 PM
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fl-mike fl-mike is offline
 
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Because it is not on the site, or anywhere on-line. Not sure why, but it is not.
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RV-6A. Mattituck TMX O-360, FP, GRT Sport EFIS, L3 Lynx NGT-9000
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N184WM reserved (RV-8)....finishing kit in progress. Titan IOX-370
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  #19  
Old 01-12-2020, 08:01 PM
jamesdavid jamesdavid is offline
 
Join Date: Nov 2017
Location: Tempe, AZ
Posts: 20
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Now that I know the big-ticket items, I am trying to figure out the best way to organize switches and breakers. This is what I have come up with. Apart from the general layout, some of the specific questions I still have are:
  • Should I put the GAD 29 on the Avionics bus, or the Main Bus? It is only needed for the Avionics (GNX 375 and GNC 255), but other examples placed it on the Main bus...
  • I have a breaker and a switch for the GAP 26 Pitot Heat. Any reason not to just use a Switch Breaker?

Thoughts and input appreciated...



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  #20  
Old 01-13-2020, 06:19 PM
Jim Frisbie Jim Frisbie is offline
 
Join Date: Jan 2016
Location: Canby
Posts: 33
Default CO detect

Where is your CO detector.?
Essential!
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